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Questions and Answers
Match the following components of public key cryptography:
Match the following components of public key cryptography:
Public key = Used for encryption Private key = Used for decryption Plaintext = Original message before encryption Ciphertext = Encrypted message
Match the following terms with their definitions in RSA encryption:
Match the following terms with their definitions in RSA encryption:
p, q (prime numbers) = Used to compute n and z n = pq = Product of two large prime numbers z = (p-1)(q-1) = Used in key generation process e (encryption exponent) = Part of the public key
Match the steps with their correct sequences in RSA key generation:
Match the steps with their correct sequences in RSA key generation:
Choose two large prime numbers p, q = Step 1 Compute n = pq, z = (p-1)(q-1) = Step 2 Choose e (encryption exponent) = Step 3 Select d (decryption exponent) = Part of step 3
Match the actions with their outcomes in public key cryptography operations:
Match the actions with their outcomes in public key cryptography operations:
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Match the terms with their correct descriptions in network security:
Match the terms with their correct descriptions in network security:
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Study Notes
Symmetric Encryption
- Symmetric encryption uses one key to encrypt and decrypt data.
- The same key is used for both encryption and decryption of a message.
- The key is known only by the sender and receiver.
- There are two techniques for symmetric encryption: block ciphers and stream ciphers.
- Block ciphers divide the message into several parts of equal size, while stream ciphers encrypt the message bit by bit.
- The strength of a symmetric cipher depends on the length of the key, the size of the block, the number of iterations, and the algorithm used.
- The most widely used algorithm is AES256, which uses 128-bit blocks and a 256-bit key.
- The disadvantage of symmetric encryption is that the sender and receiver must first exchange the secret key, which can be intercepted by a third party during the exchange.
Key Exchange
- In symmetric encryption, one of the entities involved in communication creates the symmetric key and encrypts it using a public key provided by a second entity.
- The first entity sends the encoded symmetric key to the second entity, which receives and decrypts it with the adequate private key.
Symmetric vs Asymmetric Encryption
- Symmetric encryption uses the same secret key for both encryption and decryption.
- Asymmetric encryption uses two different keys for encryption and decryption.
- Asymmetric encryption is slower than symmetric encryption, but it is stronger per bit of key length.
- Symmetric encryption algorithms are generally faster than asymmetric encryption algorithms.
- Examples of symmetric encryption algorithms include AES and DES, while examples of asymmetric encryption algorithms include RSA and DSA.
Public Key Encryption
- Public key encryption is a type of encryption that uses two different keys, a public key and a private key.
- The public key is shared with anyone who will be securely communicating with the key owner, while the private key is kept secret.
- In public key encryption, the sender uses a public key to encrypt the message, and the recipient uses its private key to decrypt the message.
- Public key infrastructure (PKI) is a set of hardware, software, organizations, and policies to make public key encryption work on the Internet.
- Public key encryption is used to create electronic signatures and establish nonrepudiation of the content.
Public Key Cryptography
- Public key cryptography is a method of encrypting or signing data with two different keys and making one of the keys, the public key, available for anyone to use.
- Data encrypted with the public key can only be decrypted with the private key.
- Public key cryptography is a radically different approach to symmetric encryption.
- Public key cryptography does not require the sender and receiver to share a secret key.
- Public key cryptography is used to create electronic signatures and establish nonrepudiation of the content.
RSA Algorithm
- RSA is a public key encryption algorithm that uses two large prime numbers p and q.
- The public key is computed as n = pq, and the private key is computed as z = (p-1)(q-1).
- The RSA algorithm is used to create electronic signatures and establish nonrepudiation of the content.
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Description
Test your knowledge on the number of keys needed for symmetric encryption, and which key the receiver requires to decrypt data from the sender. Questions cover the basic concepts of symmetric encryption and key management.
