D334 Introduction to Cryptography - Set 2 - Part 3

Correct Answer: The attacker encrypts chosen plaintext and compares it with the ciphertext

In a chosen-plaintext attack, the attacker chooses plaintext to encrypt and then compares it to the resulting ciphertext to gather information about the encryption algorithm.

Correct Answer: RSA

RSA is commonly used to secure email communications with digital signatures, providing both authentication and message integrity.

Correct Answer: Stream ciphers are faster and better suited for real-time data transmission

Stream ciphers encrypt data one bit or byte at a time, making them faster and better suited for real-time applications like audio and video streaming.

Correct Answer: An attack that precomputes possible hash values to crack passwords

A rainbow table attack uses a precomputed table of hash values and their corresponding plaintexts to quickly crack hashed passwords.

Correct Answer: AES

AES is a symmetric block cipher that encrypts data in fixed-size blocks using the same key for both encryption and decryption.

Correct Answer: It encrypts data in fixed-size blocks

A block cipher encrypts data in fixed-size blocks, typically 64 or 128 bits, as opposed to stream ciphers that encrypt data one bit or byte at a time.

Correct Answer: Differential cryptanalysis

Differential cryptanalysis involves analyzing differences between plaintext and ciphertext pairs to discover patterns that can be used to break the encryption.

Correct Answer: 256 bits

AES-256 uses a key length of 256 bits, providing a high level of security for encrypted communications and data storage.

Correct Answer: A list of certificates that have been revoked by the issuing Certificate Authority

A CRL is a list of certificates that have been revoked before their expiration date, allowing users and systems to check whether a certificate is still valid.

Correct Answer: An attack that measures the time taken to perform cryptographic operations

A timing attack exploits the time taken to perform cryptographic operations, potentially allowing attackers to deduce the encryption key or plaintext.