Symmetric and Asymmetric Cryptography
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Questions and Answers

What type of encryption uses a single key for both encryption and decryption?

  • Symmetric encryption (correct)
  • Hash function
  • Digital signature
  • Asymmetric encryption

    • What is the main challenge in symmetric encryption?

  • Key management
  • CPU overhead
  • Data encryption
  • Scalability (correct)

    • What is symmetric encryption also referred to as?

  • Secret-key algorithm (correct)
  • Asymmetric cipher
  • Public-key algorithm
  • Hash function

    • Why is asymmetric encryption often used in conjunction with symmetric encryption?

    <p>Because asymmetric encryption can be used to transfer a symmetric key</p> Signup and view all the answers

    What is the benefit of symmetric encryption over asymmetric encryption?

    <p>It requires less CPU resources</p> Signup and view all the answers

    What is the main difference between symmetric and asymmetric encryption?

    <p>The number of keys used</p> Signup and view all the answers

    What is the problem with sharing a symmetric key?

    <p>It's difficult to share a key securely</p> Signup and view all the answers

    What is the purpose of using asymmetric encryption to transfer a symmetric key?

    <p>To securely share a symmetric key</p> Signup and view all the answers

    What is referred to as public-key cryptography?

    <p>A type of encryption that uses two keys: public and private</p> Signup and view all the answers

    What is the main difference between a public key and a private key?

    <p>A public key is publicly available and a private key is kept secret</p> Signup and view all the answers

    What is the purpose of a public key?

    <p>To encrypt information</p> Signup and view all the answers

    What is the process of creating a symmetric key on both sides without sending it across the network?

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

    What happens when someone encrypts data with a public key?

    <p>The data can be decrypted with the private key</p> Signup and view all the answers

    What is the major drawback of using asymmetric encryption?

    <p>It requires high computing power and resources</p> Signup and view all the answers

    What is the relationship between a public key and a private key?

    <p>They are mathematically related but cannot be derived from each other</p> Signup and view all the answers

    What is the benefit of using Elliptic-Curve Cryptography (ECC)?

    <p>It uses smaller keys and requires less storage and transmission data</p> Signup and view all the answers

    How are a public key and a private key generated?

    <p>Using a key generation program with large random numbers and prime numbers as input</p> Signup and view all the answers

    What is the purpose of using public and private keys in asymmetric encryption?

    <p>To create a symmetric key on both sides</p> Signup and view all the answers

    Why is it difficult to scale asymmetric key encryption?

    <p>Because there's no easy way to transmit the symmetric key</p> Signup and view all the answers

    What is the purpose of a digital signature?

    <p>To verify the authenticity of a message</p> Signup and view all the answers

    What is the process of creating a symmetric key on both sides using public and private keys?

    <p>Diffie-Hellman key exchange</p> Signup and view all the answers

    What is the process of asymmetric cryptography?

    <p>Using a pair of keys, a public key and a private key, for encryption and decryption</p> Signup and view all the answers

    What happens when Bob encrypts a message with Alice's public key?

    <p>Only Alice can decrypt the message with her private key</p> Signup and view all the answers

    What is the advantage of asymmetric encryption over symmetric encryption?

    <p>It provides functionality that symmetric encryption can't do</p> Signup and view all the answers

    What is the purpose of a public key server?

    <p>To store and distribute public keys</p> Signup and view all the answers

    What is the purpose of using asymmetric encryption in key exchange?

    <p>To create a symmetric key on both sides</p> Signup and view all the answers

    What is the benefit of using asymmetric encryption in IoT devices?

    <p>It is more suitable for devices with limited resources</p> Signup and view all the answers

    What is the relationship between Bob's private key and Alice's public key?

    <p>They can be used to create a symmetric key</p> Signup and view all the answers

    Study Notes

    Symmetric Encryption

    • Uses a single key for both encryption and decryption
    • Key must be kept secret to prevent unauthorized access
    • Difficult to scale due to key sharing challenges

    Asymmetric Encryption

    • Uses a pair of keys: public and private
    • Public key is shared, while private key is kept secret
    • Public key is used for encryption, while private key is used for decryption
    • Enables secure communication over an insecure channel
    • Key pair is generated using large random numbers and prime numbers

    Asymmetric Encryption Process

    • Bob wants to send encrypted information to Alice
    • Bob uses Alice's public key to encrypt the plaintext
    • Alice uses her private key to decrypt the ciphertext
    • Same process can be reversed with Alice sending encrypted information to Bob

    Advantages of Asymmetric Encryption

    • Enables secure key exchange over an insecure channel
    • Allows for digital signatures and authentication
    • Enables the use of symmetric encryption with a shared key

    Limitations of Asymmetric Encryption

    • Requires more CPU resources and overhead compared to symmetric encryption
    • Uses large integers and prime factor numbers, which can be computationally intensive

    Elliptic-Curve Cryptography (ECC)

    • Uses curves to create asymmetric keys
    • Requires smaller keys and less storage space
    • Enables secure communication on mobile devices and IoT devices with limited computing power

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