AWS Key Management Store (KMS) Quiz
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Questions and Answers

Which of the following is NOT a characteristic of an AWS KMS key?

  • It can be exported from KMS. (correct)
  • It can encrypt data up to 4KB in size.
  • It includes metadata such as the key ID, creation date, description, and key state.
  • It can be used to generate, encrypt, and decrypt Data Encryption Keys (DEKs).

    • What type of KMS key is managed by AWS and cannot be rotated or have its key policies changed by the user?

  • Symmetric KMS Keys
  • AWS Managed KMS Keys (correct)
  • Customer Managed KMS Keys
  • Asymmetric KMS Keys

    • What is the maximum data size that a KMS key can encrypt?

  • 16KB
  • 1MB
  • 1KB
  • 4KB (correct)

    • Which of the following is a valid way to manage a Customer Managed KMS key?

    <p>Creating an alias for the KMS key.</p> Signup and view all the answers

    What is the primary difference between Symmetric and Asymmetric KMS keys?

    <p>Symmetric KMS keys use a single key for both encryption and decryption, while Asymmetric KMS keys use separate keys for encryption and decryption.</p> Signup and view all the answers

    Which of the following is NOT a benefit of using AWS KMS?

    <p>Ability to export KMS keys for use in external applications.</p> Signup and view all the answers

    What happens to a Customer Managed KMS key when the AWS account it's associated with is deleted?

    <p>The key is automatically deleted.</p> Signup and view all the answers

    Which of the following statements accurately describes the role of Data Encryption Keys (DEKs) in KMS?

    <p>DEKs are used to encrypt data that is then encrypted again using a KMS key.</p> Signup and view all the answers

    What is the maximum number of KMS keys you can create per account per region?

    <p>1000</p> Signup and view all the answers

    What is the default waiting period for deleting a KMS key?

    <p>30 days</p> Signup and view all the answers

    What is the purpose of the 'aws kms encrypt' API?

    <p>To encrypt data using a KMS key</p> Signup and view all the answers

    Which of these is NOT an AWS KMS API mentioned in the content?

    <p>aws kms get-key-policy</p> Signup and view all the answers

    What method does AWS KMS use to encrypt data in AWS services and client-side toolkits?

    <p>Envelope encryption</p> Signup and view all the answers

    What is the purpose of the 'aws kms generate-data-key-without-plaintext' API?

    <p>To generate a data key without its plaintext</p> Signup and view all the answers

    What is the primary limitation of AWS managed KMS keys regarding their usage?

    <p>You cannot use them directly in cryptographic operations.</p> Signup and view all the answers

    What is a unique characteristic of AWS owned KMS keys?

    <p>They are owned and managed by AWS services.</p> Signup and view all the answers

    How does AWS KMS handle data encryption keys?

    <p>It must be used to manage data encryption keys outside of its service.</p> Signup and view all the answers

    What is the purpose of the GenerateDataKey API in AWS KMS?

    <p>To create a data encryption key using a KMS key.</p> Signup and view all the answers

    What best defines a custom key store in AWS KMS?

    <p>A feature that integrates AWS CloudHSM with KMS for key management.</p> Signup and view all the answers

    What happens to requests made for decrypting data keys under KMS?

    <p>They are logged in AWS CloudTrail for tracking.</p> Signup and view all the answers

    Which of the following is not a function of AWS KMS?

    <p>Performing encryption in transit.</p> Signup and view all the answers

    What is a key management function that KMS supports?

    <p>Setting usage policies on KMS keys.</p> Signup and view all the answers

    Why are AWS KMS keys regional?

    <p>Because each key is restricted to specific AWS regions.</p> Signup and view all the answers

    Which statement about data keys generated by AWS KMS is correct?

    <p>They are encrypted and stored as part of the data they protect.</p> Signup and view all the answers

    What is the minimum waiting period for deleting a customer master key and associated metadata in AWS KMS?

    <p>7 days</p> Signup and view all the answers

    What is the purpose of GenerateDataKeyWithoutPlaintext API in AWS KMS?

    <p>To generate a data key without plaintext</p> Signup and view all the answers

    What is the maximum number of master keys that can be created per account per region in AWS KMS?

    <p>1000</p> Signup and view all the answers

    What is the purpose of Enable-key-rotation API in AWS KMS?

    <p>To enable key rotation</p> Signup and view all the answers

    What is the method used by AWS KMS to encrypt data in AWS services and client-side toolkits?

    <p>Envelope encryption</p> Signup and view all the answers

    What happens to a scheduled key deletion in AWS KMS during the waiting period?

    <p>It can be cancelled</p> Signup and view all the answers

    What can be done with a Customer Managed KMS key?

    <p>Its key policies can be modified.</p> Signup and view all the answers

    Which statement accurately describes the key material of a KMS key?

    <p>Key material is created by AWS KMS by default.</p> Signup and view all the answers

    Which of the following is a limitation of AWS KMS regarding KMS keys?

    <p>KMS keys can encrypt data only up to 4KB.</p> Signup and view all the answers

    What is true about the permissions associated with Customer Managed KMS keys?

    <p>They can have IAM policies that restrict their usage.</p> Signup and view all the answers

    What distinguishes AWS Managed KMS keys from Customer Managed KMS keys?

    <p>Customer Managed KMS keys are created by user discretion.</p> Signup and view all the answers

    Which statement is NOT true regarding AWS KMS keys?

    <p>AWS KMS keys can be reused across different regions without restriction.</p> Signup and view all the answers

    What are KMS keys primarily used for within AWS KMS?

    <p>To encrypt and decrypt data.</p> Signup and view all the answers

    How does AWS KMS handle the exporting of KMS keys?

    <p>KMS keys cannot be exported at all.</p> Signup and view all the answers

    What governs the use and access of AWS KMS keys?

    <p>IAM roles and policies</p> Signup and view all the answers

    Which statement about AWS owned KMS keys is accurate?

    <p>They remain fully under the control of AWS services.</p> Signup and view all the answers

    What happens to Data Encryption Keys (DEKs) managed by AWS KMS?

    <p>They must be managed outside of AWS KMS.</p> Signup and view all the answers

    For which scenario is a Custom Key Store in AWS KMS specifically designed?

    <p>To store master keys in HSMs securely</p> Signup and view all the answers

    Which statement correctly describes the fees associated with AWS managed KMS keys?

    <p>Usage can incur fees depending on the service.</p> Signup and view all the answers

    How are requests to use master keys logged in AWS KMS?

    <p>In AWS CloudTrail</p> Signup and view all the answers

    In what context can AWS KMS keys not be used directly by users?

    <p>In cryptographic operations directly</p> Signup and view all the answers

    What does the GenerateDataKey API do in AWS KMS?

    <p>Generates a data key using a KMS key</p> Signup and view all the answers

    Which type of keys requires you to have CloudHSM resources to use custom key stores?

    <p>Custom KMS keys</p> Signup and view all the answers

    What is a unique feature of KMS compared to AWS Secrets Manager?

    <p>KMS is designed specifically for encryption key management.</p> Signup and view all the answers

    What is the purpose of scheduling a customer master key for deletion?

    <p>To verify the impact of deleting a key on applications and users</p> Signup and view all the answers

    Which API is used to generate a data key that is used to encrypt data?

    <p>aws kms generate-data-key</p> Signup and view all the answers

    What is the limit on the number of KMS keys that can be created per account per region?

    <p>1000</p> Signup and view all the answers

    What happens to a scheduled key deletion during the waiting period?

    <p>The key deletion can be cancelled</p> Signup and view all the answers

    What is the primary method used by AWS KMS to encrypt data in AWS services and client-side toolkits?

    <p>Envelope encryption</p> Signup and view all the answers

    What is the minimum waiting period for deleting a customer master key and associated metadata?

    <p>7 days</p> Signup and view all the answers

    Which of these statements accurately describes the use of AWS managed KMS keys?

    <p>They are managed by AWS services on behalf of users.</p> Signup and view all the answers

    What is the primary purpose of Data Encryption Keys (DEKs) in AWS KMS?

    <p>To encrypt and decrypt data directly.</p> Signup and view all the answers

    Which of the following accurately describes the role of AWS CloudHSM in AWS KMS?

    <p>It is an optional service that can be used for storing and managing keys.</p> Signup and view all the answers

    Which of the following is a feature of AWS KMS that allows for increased control over key management?

    <p>The ability to create and manage KMS keys in an AWS CloudHSM cluster.</p> Signup and view all the answers

    How does AWS KMS ensure the security of master keys stored in a custom key store?

    <p>The master keys are never stored in plaintext and all operations are performed within the HSMs.</p> Signup and view all the answers

    Which statement accurately describes the interaction between AWS KMS and AWS services when decrypting data?

    <p>AWS services request AWS KMS to decrypt the data key using the master key.</p> Signup and view all the answers

    What is the primary difference between AWS managed KMS keys and Customer Managed KMS keys?

    <p>AWS managed keys are controlled by AWS services, while Customer Managed keys are managed by users.</p> Signup and view all the answers

    Which of the following actions can be performed on a Customer Managed KMS key?

    <p>Changing the key policy to grant permissions to specific users or roles.</p> Signup and view all the answers

    What is a key management function that KMS supports?

    <p>Managing and rotating master keys.</p> Signup and view all the answers

    Which of the following statements accurately describes the fees associated with AWS managed KMS keys?

    <p>Users are not charged for AWS managed KMS keys unless they exceed the free tier limits.</p> Signup and view all the answers

    What is a distinguishing characteristic of Customer Managed KMS keys compared to AWS Managed KMS keys?

    <p>Customer Managed KMS keys allow you to control their key policies, IAM policies, and grants.</p> Signup and view all the answers

    What is a key limitation of AWS Managed KMS keys?

    <p>They cannot be rotated or have their key policies changed.</p> Signup and view all the answers

    What is a primary function of a KMS key in AWS KMS?

    <p>To encrypt and decrypt data, both directly and through Data Encryption Keys (DEKs).</p> Signup and view all the answers

    What is the maximum size of data that a KMS key can encrypt directly?

    <p>4 KB</p> Signup and view all the answers

    Which of the following is a key distinction between symmetric and asymmetric KMS keys?

    <p>Symmetric KMS keys use the same key for encryption and decryption, while asymmetric KMS keys use separate keys.</p> Signup and view all the answers

    What is the role of Data Encryption Keys (DEKs) in AWS KMS?

    <p>DEKs are used to encrypt data, which is then encrypted again using the KMS key.</p> Signup and view all the answers

    Which of the following is NOT a valid way to manage a Customer Managed KMS key?

    <p>Changing the key policy of an AWS Managed KMS key.</p> Signup and view all the answers

    What is the primary purpose of the GenerateDataKey API in AWS KMS?

    <p>To generate a Data Encryption Key (DEK) that can be used to encrypt data.</p> Signup and view all the answers

    What is the minimum waiting period for deleting a customer master key and associated metadata in AWS KMS?

    <p>7 days</p> Signup and view all the answers

    What is the purpose of the 'aws kms re-encrypt' API?

    <p>To update the key material for a master key</p> Signup and view all the answers

    What happens to a scheduled key deletion in AWS KMS during the waiting period?

    <p>The key deletion can be cancelled</p> Signup and view all the answers

    What is the advantage of using envelope encryption with AWS KMS?

    <p>It generates data keys that can be used to encrypt data</p> Signup and view all the answers

    What is the limit on the number of data keys that can be derived using a master key and used in your application?

    <p>Unlimited</p> Signup and view all the answers

    What happens to AWS managed master keys created on your behalf for use within supported AWS services?

    <p>They do not count against the KMS key limit</p> Signup and view all the answers

    What crucial element does a KMS key contain for encrypting and decrypting data?

    <p>Key material</p> Signup and view all the answers

    Which action is NOT allowed with AWS Managed KMS keys?

    <p>Rotate key policies</p> Signup and view all the answers

    What happens to the private keys of asymmetric KMS keys in AWS KMS?

    <p>They remain encrypted within AWS KMS.</p> Signup and view all the answers

    Which of the following statements is true about Customer Managed KMS keys?

    <p>They incur fees for monthly usage and excess usage.</p> Signup and view all the answers

    How many bytes can a KMS key encrypt at most for a single operation?

    <p>4096 bytes</p> Signup and view all the answers

    Which of the following is a feature of Customer Managed KMS keys?

    <p>They allow the creation of aliases referring to the key.</p> Signup and view all the answers

    What is a key characteristic of AWS KMS keys regarding their exportation?

    <p>They can never be exported out of KMS.</p> Signup and view all the answers

    Which statement best describes the differences in management between AWS Managed KMS keys and Customer Managed KMS keys?

    <p>Customer Managed KMS keys allow for rotation and management.</p> Signup and view all the answers

    What is a characteristic of AWS owned KMS keys?

    <p>They are owned and managed by AWS services.</p> Signup and view all the answers

    What must a user do with data encryption keys once they are generated?

    <p>Manage and use these keys outside of AWS KMS.</p> Signup and view all the answers

    How does AWS KMS handle logging of key usage?

    <p>All requests to use master keys are logged in AWS CloudTrail.</p> Signup and view all the answers

    What is the role of the GenerateDataKey API in AWS KMS?

    <p>To create a data encryption key using a KMS key.</p> Signup and view all the answers

    In which scenario are data encryption keys typically used?

    <p>To encrypt large amounts of data and other encryption keys.</p> Signup and view all the answers

    Which statement about AWS KMS keys is true?

    <p>KMS supports both symmetric and asymmetric key types.</p> Signup and view all the answers

    What is a unique feature of a Custom Key Store in AWS KMS?

    <p>Key material never leaves the HSMs in plaintext.</p> Signup and view all the answers

    How are the fees structured for AWS managed KMS keys?

    <p>Fees are incurred only when keys are actively used beyond the free tier.</p> Signup and view all the answers

    What governs the access and management of keys in AWS KMS?

    <p>IAM users and roles.</p> Signup and view all the answers

    Which statement about the AWS Key Management Service (KMS) is accurate?

    <p>KMS operations involving keys are logged for auditing purposes.</p> Signup and view all the answers

    What is the minimum waiting period for deleting a customer master key and associated metadata in AWS KMS?

    <p>7 days</p> Signup and view all the answers

    What is the purpose of the 'aws kms re-encrypt' API?

    <p>To re-encrypt data keys with a new master key</p> Signup and view all the answers

    What is the limit on the number of data keys that can be derived using a master key and used in your application or by AWS services?

    <p>No limit</p> Signup and view all the answers

    What happens to a scheduled key deletion in AWS KMS during the waiting period?

    <p>The key can be cancelled during the waiting period</p> Signup and view all the answers

    What is the method used by AWS KMS to encrypt data in AWS services and client-side toolkits?

    <p>Envelope encryption</p> Signup and view all the answers

    What counts towards the limit of 1000 KMS keys per account per region?

    <p>Both enabled and disabled keys</p> Signup and view all the answers

    Which of the following statements accurately describes the role of Data Encryption Keys (DEKs) in AWS KMS?

    <p>DEKs are used to encrypt data that is then further encrypted using the KMS key.</p> Signup and view all the answers

    Which of these options accurately describes the distinction between Customer Managed KMS keys and AWS Managed KMS keys?

    <p>Customer Managed KMS keys are managed by the user, while AWS Managed KMS keys are managed by AWS services.</p> Signup and view all the answers

    Which of the following is NOT a valid way to manage a Customer Managed KMS key?

    <p>Exporting the key material for use outside of AWS.</p> Signup and view all the answers

    What is a unique characteristic of AWS owned KMS keys?

    <p>They are managed by AWS services and cannot be rotated or have their key policies changed by the user.</p> Signup and view all the answers

    Which of the following statements accurately describes the key material of a KMS key?

    <p>The key material is used to encrypt and decrypt DEKs.</p> Signup and view all the answers

    Which of the following is NOT a function of AWS KMS?

    <p>Providing a solution for storing and managing passwords.</p> Signup and view all the answers

    Which statement is NOT true regarding AWS KMS keys?

    <p>AWS KMS keys can be exported for use outside of AWS.</p> Signup and view all the answers

    What is the purpose of scheduling a customer master key for deletion?

    <p>To initiate a process that will permanently delete the key and its associated metadata after a waiting period.</p> Signup and view all the answers

    Which of these statements accurately describes the handling of data encryption keys (DEKs) by AWS KMS?

    <p>AWS KMS generates, encrypts, and decrypts DEKs, but does not store or manage them.</p> Signup and view all the answers

    Which of the following statements is TRUE regarding AWS managed KMS keys?

    <p>AWS managed KMS keys can be subject to fees for excessive usage, but some AWS services may cover these costs.</p> Signup and view all the answers

    How does AWS KMS handle the encryption and decryption of data in AWS services?

    <p>AWS services encrypt data using DEKs, and KMS encrypts the DEK using the master key and stores both securely.</p> Signup and view all the answers

    What is the primary difference between AWS managed KMS keys and Customer Managed KMS keys?

    <p>AWS managed KMS keys are owned and managed by AWS, while Customer Managed KMS keys are managed by users in their AWS account.</p> Signup and view all the answers

    What is the primary purpose of the GenerateDataKey API in AWS KMS?

    <p>To create and manage data encryption keys (DEKs) for encrypting data.</p> Signup and view all the answers

    What is the purpose of the 'aws kms enable-key-rotation' API?

    <p>To enable automatic key rotation for a KMS key.</p> Signup and view all the answers

    Why are AWS KMS keys regional?

    <p>To ensure data locality and compliance with regional regulations.</p> Signup and view all the answers

    Which of the following is NOT a feature of the AWS KMS custom key store?

    <p>It allows you to manage AWS owned KMS keys directly within your custom key store.</p> Signup and view all the answers

    What is the primary difference between AWS KMS and Secrets Manager?

    <p>AWS KMS is primarily used for encrypting data at rest, while Secrets Manager is designed for storing and managing sensitive data such as passwords and API keys.</p> Signup and view all the answers

    Which of the following is TRUE about AWS owned KMS keys?

    <p>AWS owned KMS keys are used to encrypt and decrypt data within a specific AWS service and cannot be accessed directly.</p> Signup and view all the answers

    When scheduling a customer master key for deletion, what is the minimum waiting period that can be configured?

    <p>7 days</p> Signup and view all the answers

    Which API is used to encrypt data using a data key generated by AWS KMS?

    <p>aws kms encrypt</p> Signup and view all the answers

    Which of the following statements accurately describes the purpose of AWS KMS Envelope Encryption?

    <p>Data keys are used to encrypt data, and those data keys are then encrypted using master keys.</p> Signup and view all the answers

    What is the maximum number of KMS keys that can be created per account per region?

    <p>1000</p> Signup and view all the answers

    What is the primary purpose of the Enable-key-rotation API in AWS KMS?

    <p>To enable automatic rotation of the key material for a KMS key.</p> Signup and view all the answers

    Which statement accurately describes the relationship between AWS managed master keys and the KMS key limit?

    <p>AWS managed master keys do not count towards the KMS key limit.</p> Signup and view all the answers

    Which of these statements about AWS Managed KMS keys is TRUE?

    <p>They are created, managed, and used on your behalf by an AWS service integrated with KMS.</p> Signup and view all the answers

    What is the maximum data size a KMS key can encrypt?

    <p>4KB</p> Signup and view all the answers

    Which of these actions can be performed on a Customer Managed KMS key?

    <p>Schedule a KMS key for deletion without actually deleting it.</p> Signup and view all the answers

    What is the primary difference between Symmetric and Asymmetric KMS keys?

    <p>Symmetric keys use the same key for encryption and decryption, while asymmetric keys use different keys for encryption and decryption.</p> Signup and view all the answers

    What is the purpose of a Data Encryption Key (DEK)?

    <p>To directly encrypt and decrypt user data.</p> Signup and view all the answers

    What is NOT a function of AWS KMS?

    <p>Exporting KMS keys to external systems.</p> Signup and view all the answers

    Which of the following is TRUE about the cryptographic material of a KMS key?

    <p>It is stored in an encrypted form within the KMS service, and it never leaves AWS KMS unencrypted.</p> Signup and view all the answers

    Which of the following scenarios is specifically designed for the use of a Custom Key Store in AWS KMS?

    <p>Using a hardware security module (HSM) for storing sensitive key material.</p> Signup and view all the answers

    Which of these options are the true statements about AWS owned KMS keys?

    <p>AWS owned KMS keys are owned and managed by AWS.</p> Signup and view all the answers

    What happens to a data key after it is generated using the GenerateDataKey API in KMS?

    <p>It is stored in a secure location outside of AWS KMS, and the user is responsible for managing and tracking it.</p> Signup and view all the answers

    What is a primary benefit of using a Custom Key Store in AWS KMS?

    <p>It allows you to store KMS master keys in your own CloudHSM cluster, enhancing security and control.</p> Signup and view all the answers

    Which of these is a key management function that AWS KMS does NOT allow?

    <p>Directly managing the cryptographic operations with data encryption keys.</p> Signup and view all the answers

    What is the primary purpose of AWS KMS?

    <p>To manage and control the encryption keys used for protecting data at rest.</p> Signup and view all the answers

    Which of the following is TRUE about master keys in a Custom Key Store?

    <p>They are never exported from the CloudHSM cluster.</p> Signup and view all the answers

    How does KMS ensure that the appropriate users can access and use master keys?

    <p>By assigning specific permissions to IAM users and roles.</p> Signup and view all the answers

    How does KMS ensure that data can be decrypted by authorized users?

    <p>KMS grants temporary permissions to users to decrypt data based on the master key policy.</p> Signup and view all the answers

    Which of the following statements is TRUE about AWS KMS key material?

    <p>It can be stored in both symmetric and asymmetric forms.</p> Signup and view all the answers

    What is the main purpose of the Enable-key-rotation API in KMS?

    <p>To automatically rotate KMS keys on a regular basis.</p> Signup and view all the answers

    Study Notes

    AWS Key Management Store (KMS)

    • AWS KMS is a managed service for encrypting data, providing key storage, management, and auditing.
    • Centrally manages and securely stores AWS KMS keys, previously known as customer master keys (CMKs).

    KMS Keys

    • KMS keys consist of metadata including key ID, creation date, description, and key state.
    • Supports both symmetric and asymmetric keys, with symmetric keys remaining encrypted within AWS KMS.
    • A KMS key can encrypt data up to 4KB and is unable to be exported from KMS.

    Key Types

    • Customer Managed KMS keys: Created and managed within user accounts; users have complete control and incur monthly fees.
    • AWS Managed KMS keys: Created and managed by integrated AWS services; users cannot modify them and incur no monthly fees, but charges may apply for excessive use.
    • AWS Owned KMS keys: Managed by AWS services, invisible to users; no fees are associated, and they don’t count against account limits.

    Data Encryption Keys

    • Data keys are used for encrypting large amounts of data and other data encryption keys.
    • AWS KMS does not store or manage these data keys; they must be handled externally.
    • The GenerateDataKey API creates data encryption keys using KMS keys.

    KMS Functionality

    • Utilizes hardware security modules (HSMs) for protecting KMS keys.
    • Integrates seamlessly with various AWS services, such as Lambda, S3, EBS, DynamoDB, and SQS.
    • All requests to master keys are logged in AWS CloudTrail for tracking usage.

    Key Management and Policies

    • Users determine usage policies for KMS keys to specify which users can encrypt/decrypt data.
    • KMS supports both symmetric and asymmetric keys but is limited to encryption at rest (not in transit).
    • Key management functions include creating, enabling, disabling keys, and deleting them after a configurable waiting period.

    Custom Key Store

    • Combines AWS CloudHSM controls with AWS KMS ease of use, allowing users to generate key material within a CloudHSM cluster.
    • Ensures keys remain secure and in plaintext only within HSMs.

    Key Deletion

    • Users can schedule deletion of customer master keys with a waiting period of 7 to 30 days, allowing assessment of impact before permanent deletion.
    • Default waiting period is 30 days, and deletion can be canceled during this time.

    Important APIs

    • Encrypt and Decrypt for encrypting/decrypting data.
    • Re-encrypt for changing the encryption key used.
    • GenerateDataKey for creating a data encryption key.

    KMS Envelope Encryption

    • Integrates with AWS clients using envelope encryption for better data security.
    • Data keys are encrypted using master keys through KMS to secure the data itself.

    Limits and Recommendations

    • Up to 1000 KMS keys can be created per account per region, including both enabled and disabled keys.
    • It’s advisable to delete disabled keys no longer in use to manage limits efficiently.
    • There are no restrictions on the number of data keys that can be generated from master keys.

    AWS Key Management Store (KMS)

    • AWS KMS is a managed service for encrypting data, providing key storage, management, and auditing.
    • Centrally manages and securely stores AWS KMS keys, previously known as customer master keys (CMKs).

    KMS Keys

    • KMS keys consist of metadata including key ID, creation date, description, and key state.
    • Supports both symmetric and asymmetric keys, with symmetric keys remaining encrypted within AWS KMS.
    • A KMS key can encrypt data up to 4KB and is unable to be exported from KMS.

    Key Types

    • Customer Managed KMS keys: Created and managed within user accounts; users have complete control and incur monthly fees.
    • AWS Managed KMS keys: Created and managed by integrated AWS services; users cannot modify them and incur no monthly fees, but charges may apply for excessive use.
    • AWS Owned KMS keys: Managed by AWS services, invisible to users; no fees are associated, and they don’t count against account limits.

    Data Encryption Keys

    • Data keys are used for encrypting large amounts of data and other data encryption keys.
    • AWS KMS does not store or manage these data keys; they must be handled externally.
    • The GenerateDataKey API creates data encryption keys using KMS keys.

    KMS Functionality

    • Utilizes hardware security modules (HSMs) for protecting KMS keys.
    • Integrates seamlessly with various AWS services, such as Lambda, S3, EBS, DynamoDB, and SQS.
    • All requests to master keys are logged in AWS CloudTrail for tracking usage.

    Key Management and Policies

    • Users determine usage policies for KMS keys to specify which users can encrypt/decrypt data.
    • KMS supports both symmetric and asymmetric keys but is limited to encryption at rest (not in transit).
    • Key management functions include creating, enabling, disabling keys, and deleting them after a configurable waiting period.

    Custom Key Store

    • Combines AWS CloudHSM controls with AWS KMS ease of use, allowing users to generate key material within a CloudHSM cluster.
    • Ensures keys remain secure and in plaintext only within HSMs.

    Key Deletion

    • Users can schedule deletion of customer master keys with a waiting period of 7 to 30 days, allowing assessment of impact before permanent deletion.
    • Default waiting period is 30 days, and deletion can be canceled during this time.

    Important APIs

    • Encrypt and Decrypt for encrypting/decrypting data.
    • Re-encrypt for changing the encryption key used.
    • GenerateDataKey for creating a data encryption key.

    KMS Envelope Encryption

    • Integrates with AWS clients using envelope encryption for better data security.
    • Data keys are encrypted using master keys through KMS to secure the data itself.

    Limits and Recommendations

    • Up to 1000 KMS keys can be created per account per region, including both enabled and disabled keys.
    • It’s advisable to delete disabled keys no longer in use to manage limits efficiently.
    • There are no restrictions on the number of data keys that can be generated from master keys.

    AWS Key Management Store (KMS)

    • AWS KMS is a managed service for encrypting data, providing key storage, management, and auditing.
    • Centrally manages and securely stores AWS KMS keys, previously known as customer master keys (CMKs).

    KMS Keys

    • KMS keys consist of metadata including key ID, creation date, description, and key state.
    • Supports both symmetric and asymmetric keys, with symmetric keys remaining encrypted within AWS KMS.
    • A KMS key can encrypt data up to 4KB and is unable to be exported from KMS.

    Key Types

    • Customer Managed KMS keys: Created and managed within user accounts; users have complete control and incur monthly fees.
    • AWS Managed KMS keys: Created and managed by integrated AWS services; users cannot modify them and incur no monthly fees, but charges may apply for excessive use.
    • AWS Owned KMS keys: Managed by AWS services, invisible to users; no fees are associated, and they don’t count against account limits.

    Data Encryption Keys

    • Data keys are used for encrypting large amounts of data and other data encryption keys.
    • AWS KMS does not store or manage these data keys; they must be handled externally.
    • The GenerateDataKey API creates data encryption keys using KMS keys.

    KMS Functionality

    • Utilizes hardware security modules (HSMs) for protecting KMS keys.
    • Integrates seamlessly with various AWS services, such as Lambda, S3, EBS, DynamoDB, and SQS.
    • All requests to master keys are logged in AWS CloudTrail for tracking usage.

    Key Management and Policies

    • Users determine usage policies for KMS keys to specify which users can encrypt/decrypt data.
    • KMS supports both symmetric and asymmetric keys but is limited to encryption at rest (not in transit).
    • Key management functions include creating, enabling, disabling keys, and deleting them after a configurable waiting period.

    Custom Key Store

    • Combines AWS CloudHSM controls with AWS KMS ease of use, allowing users to generate key material within a CloudHSM cluster.
    • Ensures keys remain secure and in plaintext only within HSMs.

    Key Deletion

    • Users can schedule deletion of customer master keys with a waiting period of 7 to 30 days, allowing assessment of impact before permanent deletion.
    • Default waiting period is 30 days, and deletion can be canceled during this time.

    Important APIs

    • Encrypt and Decrypt for encrypting/decrypting data.
    • Re-encrypt for changing the encryption key used.
    • GenerateDataKey for creating a data encryption key.

    KMS Envelope Encryption

    • Integrates with AWS clients using envelope encryption for better data security.
    • Data keys are encrypted using master keys through KMS to secure the data itself.

    Limits and Recommendations

    • Up to 1000 KMS keys can be created per account per region, including both enabled and disabled keys.
    • It’s advisable to delete disabled keys no longer in use to manage limits efficiently.
    • There are no restrictions on the number of data keys that can be generated from master keys.

    AWS Key Management Store (KMS)

    • AWS KMS is a managed service for encrypting data, providing key storage, management, and auditing.
    • Centrally manages and securely stores AWS KMS keys, previously known as customer master keys (CMKs).

    KMS Keys

    • KMS keys consist of metadata including key ID, creation date, description, and key state.
    • Supports both symmetric and asymmetric keys, with symmetric keys remaining encrypted within AWS KMS.
    • A KMS key can encrypt data up to 4KB and is unable to be exported from KMS.

    Key Types

    • Customer Managed KMS keys: Created and managed within user accounts; users have complete control and incur monthly fees.
    • AWS Managed KMS keys: Created and managed by integrated AWS services; users cannot modify them and incur no monthly fees, but charges may apply for excessive use.
    • AWS Owned KMS keys: Managed by AWS services, invisible to users; no fees are associated, and they don’t count against account limits.

    Data Encryption Keys

    • Data keys are used for encrypting large amounts of data and other data encryption keys.
    • AWS KMS does not store or manage these data keys; they must be handled externally.
    • The GenerateDataKey API creates data encryption keys using KMS keys.

    KMS Functionality

    • Utilizes hardware security modules (HSMs) for protecting KMS keys.
    • Integrates seamlessly with various AWS services, such as Lambda, S3, EBS, DynamoDB, and SQS.
    • All requests to master keys are logged in AWS CloudTrail for tracking usage.

    Key Management and Policies

    • Users determine usage policies for KMS keys to specify which users can encrypt/decrypt data.
    • KMS supports both symmetric and asymmetric keys but is limited to encryption at rest (not in transit).
    • Key management functions include creating, enabling, disabling keys, and deleting them after a configurable waiting period.

    Custom Key Store

    • Combines AWS CloudHSM controls with AWS KMS ease of use, allowing users to generate key material within a CloudHSM cluster.
    • Ensures keys remain secure and in plaintext only within HSMs.

    Key Deletion

    • Users can schedule deletion of customer master keys with a waiting period of 7 to 30 days, allowing assessment of impact before permanent deletion.
    • Default waiting period is 30 days, and deletion can be canceled during this time.

    Important APIs

    • Encrypt and Decrypt for encrypting/decrypting data.
    • Re-encrypt for changing the encryption key used.
    • GenerateDataKey for creating a data encryption key.

    KMS Envelope Encryption

    • Integrates with AWS clients using envelope encryption for better data security.
    • Data keys are encrypted using master keys through KMS to secure the data itself.

    Limits and Recommendations

    • Up to 1000 KMS keys can be created per account per region, including both enabled and disabled keys.
    • It’s advisable to delete disabled keys no longer in use to manage limits efficiently.
    • There are no restrictions on the number of data keys that can be generated from master keys.

    AWS Key Management Store (KMS)

    • AWS KMS is a managed service for encrypting data, providing key storage, management, and auditing.
    • Centrally manages and securely stores AWS KMS keys, previously known as customer master keys (CMKs).

    KMS Keys

    • KMS keys consist of metadata including key ID, creation date, description, and key state.
    • Supports both symmetric and asymmetric keys, with symmetric keys remaining encrypted within AWS KMS.
    • A KMS key can encrypt data up to 4KB and is unable to be exported from KMS.

    Key Types

    • Customer Managed KMS keys: Created and managed within user accounts; users have complete control and incur monthly fees.
    • AWS Managed KMS keys: Created and managed by integrated AWS services; users cannot modify them and incur no monthly fees, but charges may apply for excessive use.
    • AWS Owned KMS keys: Managed by AWS services, invisible to users; no fees are associated, and they don’t count against account limits.

    Data Encryption Keys

    • Data keys are used for encrypting large amounts of data and other data encryption keys.
    • AWS KMS does not store or manage these data keys; they must be handled externally.
    • The GenerateDataKey API creates data encryption keys using KMS keys.

    KMS Functionality

    • Utilizes hardware security modules (HSMs) for protecting KMS keys.
    • Integrates seamlessly with various AWS services, such as Lambda, S3, EBS, DynamoDB, and SQS.
    • All requests to master keys are logged in AWS CloudTrail for tracking usage.

    Key Management and Policies

    • Users determine usage policies for KMS keys to specify which users can encrypt/decrypt data.
    • KMS supports both symmetric and asymmetric keys but is limited to encryption at rest (not in transit).
    • Key management functions include creating, enabling, disabling keys, and deleting them after a configurable waiting period.

    Custom Key Store

    • Combines AWS CloudHSM controls with AWS KMS ease of use, allowing users to generate key material within a CloudHSM cluster.
    • Ensures keys remain secure and in plaintext only within HSMs.

    Key Deletion

    • Users can schedule deletion of customer master keys with a waiting period of 7 to 30 days, allowing assessment of impact before permanent deletion.
    • Default waiting period is 30 days, and deletion can be canceled during this time.

    Important APIs

    • Encrypt and Decrypt for encrypting/decrypting data.
    • Re-encrypt for changing the encryption key used.
    • GenerateDataKey for creating a data encryption key.

    KMS Envelope Encryption

    • Integrates with AWS clients using envelope encryption for better data security.
    • Data keys are encrypted using master keys through KMS to secure the data itself.

    Limits and Recommendations

    • Up to 1000 KMS keys can be created per account per region, including both enabled and disabled keys.
    • It’s advisable to delete disabled keys no longer in use to manage limits efficiently.
    • There are no restrictions on the number of data keys that can be generated from master keys.

    AWS Key Management Store (KMS)

    • AWS KMS is a managed service for data encryption and key management.
    • Provides a reliable storage, management, and auditing solution for encryption across AWS services.
    • Centrally manages and securely stores encryption keys, known as AWS KMS keys.

    KMS Key Composition

    • A KMS key includes metadata such as key ID, creation date, description, and key state.
    • Contains key material used for encryption and decryption of data.
    • Supports symmetric and asymmetric KMS keys.
    • Key material remains encrypted within AWS KMS, ensuring security.

    Types of KMS Keys

    • Customer Managed KMS Keys:
      • Created and managed by the customer.
      • Allows full control over key policies, IAM policies, and grants.
      • Incur fees for creation and usage beyond the free tier.
    • AWS Managed KMS Keys:
      • Created and managed by AWS services for the customer's account.
      • Limited control over rotation and key policies.
      • No monthly fee for these keys.
    • AWS Owned KMS Keys:
      • Owned by AWS services for use across multiple accounts.
      • No visibility or management required by the customer.
      • No fees associated with these keys.

    Data Encryption Keys (DEKs)

    • Used for encrypting larger datasets and other data encryption keys.
    • Generated, encrypted, and decrypted using AWS KMS keys.
    • Managed outside of AWS KMS; KMS doesn't store or track these keys.

    Key Management Capabilities

    • Usage policies determine which users can perform encryption and decryption.
    • KMS keys can be generated within KMS or imported from external infrastructure.
    • Encrypted data must be handled within HSMs in certified environments.

    KMS Integration and Compliance

    • Works with various AWS services including Lambda, S3, EBS, EFS, DynamoDB, and SQS.
    • Requests for master key usage are logged via AWS CloudTrail for auditing.
    • Validated by compliance standards such as PCI DSS Level 1 and FIPS 140-2 Level 2.
    • Specifically designed for encryption key management, distinct from Secrets Manager.

    Key Deletion and Management

    • Keys can be scheduled for deletion with a waiting period of 7 to 30 days, defaulting to 30 days.
    • Deletion can be canceled during the waiting period to assess impact on applications.

    APIs for KMS Operations

    • Key APIs include:
      • Encrypt: Encrypt data.
      • Decrypt: Decrypt data.
      • Re-encrypt: Change encryption without intervention.
      • Enable-key-rotation: Automatically rotate keys.
      • GenerateDataKey: Create a data encryption key.

    KMS Limits

    • Maximum of 1000 KMS keys per account per region, including enabled and disabled keys.
    • No limits on the number of data keys derivable from a master key.
    • Identify and delete unused disabled keys to manage limits effectively.

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    Test your knowledge of AWS Key Management Store (KMS), a managed service for encrypting data, managing and storing keys, and controlling encryption across AWS services.

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