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Last Updated On: 17-Feb-2025

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Question # 1

With Cipher-block chaining (CBC) what happens?
A. The block cipher is turned into a stream cipher
B. The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
C. Each block of plaintext is XORed with the previous ciphertext block before being encrypted
D. The cipher text from the current round is XORed with the plaintext for the next round

C. Each block of plaintext is XORed with the previous ciphertext block before being encrypted

In CBC mode, each block of plaintext is XORed with the previous ciphertext block before being encrypted. This way, each ciphertext block depends on all plaintext blocks processed up to that point. To make each message unique, an initialization vector must be used in the first block.

Question # 2

Bruce Schneier is a well-known and highly respected cryptographer. He has developed several pseudo random number generators as well as worked on teams developing symmetric ciphers. Which one of the following is a symmetric block cipher designed in 1993 by Bruce Schneier team that is unpatented?
A. Pegasus
B. Blowfish
C. SHA1
D. AES

B. Blowfish

Question # 3

What is Kerchoff's principle?
A. A minimum of 15 rounds is needed for a Feistel cipher to be secure
B. Only the key needs to be secret, not the actual algorithm
C. Both algorithm and key should be kept secret
D. A minimum key size of 256 bits is necessary for security

B. Only the key needs to be secret, not the actual algorithm

Question # 4

If the round function is a cryptographically secure pseudorandom function, then ___rounds is sufficient to make it a "strong" pseudorandom permutation.
A. 15
B. 16
C. 3
D. 4

D. 4

Question # 5

Which of the following areas is considered a strength of symmetric key cryptography when compared with asymmetric algorithms?
A. Key distribution
B. Security
C. Scalability
D. Speed

D. Speed

Question # 6

How does Kerberos generate the first secret key in the authentication process?
A. By generating a random AES key
B. By creating a hash of the user password
C. By hashing the user ID, network ID. and salt
D. By using the user's public key

B. By creating a hash of the user password

Question # 7

What best describes the shifting of each letter a fixed number of spaces to the left or right?
A. Single substitution
B. Multi substitution
C. XOR
D. Bit shifting

D. Bit shifting

Substitution of single letters separately—simple substitution—can be demonstrated by writing out the alphabet in some order to represent the substitution. This is termed a substitution alphabet. The cipher alphabet may be shifted or reversed (creating the Caesar and Atbash ciphers, respectively) or scrambled in a more complex fashion, in which case it is called a mixed alphabet or deranged alphabet.

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