CNS - Quiz - S2 - SS2024-25

On Encrypting “cryptography” using Vigenere Cipher System using the keyword “LUCKY” we get cipher text

• nlazeiibljji

• nlazeiibljii

• okaaeiibljli

• mlaaeiibljki

Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis.

• Random Polyalphabetic, Plaintext, Playfair

• Random Polyalphabetic, Playfair, Vignere

• Random Polyalphabetic, Vignere, Playfair, Plaintext

• Random Monoalphabetic, Playfair, Vernam

In cryptography, the order of the letters in a message is rearranged by

• a.Transposition ciphers

• b.Substitution ciphers

• c.Both (a) and (b)

• d.Quadratic ciphers

In the DES algorithm the round key is ____bit and the Round Input is ____bits.

• 64,32

• 48, 32

• 56, 24

• 32, 32

What is the expanded key size of AES-192?

• 44 words

• 60 words

• 52 words

• 36 words

________ensures that sensitive information are accessed only by an authorized person and kept away from those not authorized to possess them.

• Availability

• Cryptography

• Integrity

• Confidentiality

Encryption and decryption provide secrecy, or confidentiality, but not

• Authentication

• Integrity

• Privacy

• All the above

The message in SHA-512 is padded so that its length is

• 896 mod 1024

• 832 mod 1024

• 768 mod 1024

• 960 mod 1024

Another name for Message authentication codes is

• cryptographic codebreak

• cryptographic codesum

• cryptographic checksum

• cryptographic checkbreak

PGP makes use of which cryptographic algorithm?

• DES

• AES

• RSA

• Rabin