ITBP301_Chapter 02

What is the key characteristic of symmetric encryption?

• It uses two keys, one public and one private
• It only encrypts text data
• It requires digital certificates
• It uses the same key for encryption and decryption

Which of the following is a stream cipher feature?

• Encrypts data in 64-bit blocks
• Encrypts data bit-by-bit or byte-by-byte
• Requires asymmetric keys
• Always slower than block ciphers

One major drawback of DES is:

• It uses a public key infrastructure
• It uses a 64-bit key which is insecure
• Its 56-bit key is vulnerable to brute-force attacks
• It has poor performance in hardware

What is the output of a hash function commonly called?

• Ciphertext
• Plaintext
• Digital signature
• Hash value

Which application is not typically associated with hash functions?

• Password verification
• Digital signature verification
• Real-time audio encryption
• Message integrity checking

What does MAC stand for?

• Message Algorithm Code
• Message Authentication Code
• Multi Access Code
• Manual Authentication Check

Asymmetric encryption uses:

• Only one key for all users
• A pair of related keys – public and private
• Multiple shared keys
• A single private key for all operations

A digital signature ensures:

• Message confidentiality only
• Message compression
• Message integrity and authentication
• Fast transmission of encrypted data

Why are random numbers important in cryptography?

• For formatting encrypted messages
• For beautifying hash values
• For key generation and security mechanisms
• For compressing large messages

A true random number generator (TRNG) typically:

• Measures unpredictable physical processes
• Is based on pseudorandom algorithms
• Guarantees faster performance than PRNG
• Uses a mathematical formula