TEST BANK : Cryptography and Network Security Principles EXAM TEST QUESTIONS WITH SOLVED ANSWERS .

TEST BANK : Cryptography and Network Security
Principles EXAM TEST QUESTIONS WITH SOLVED
ANSWERS .


2, 2 - CORRECT ANSWER✅✅1. The simplest form of multiple encryption has
__________ encryption stages and _____keys.

3 - CORRECT ANSWER✅✅9. Triple DES makes use of __________ stages of the
DES algorithm, using a total of two or three distinct keys

5 - CORRECT ANSWER✅✅6. ___ modes of operation have been standardized by
NIST for use with
symmetric block ciphers such as DES and AES.

8 bits - CORRECT ANSWER✅✅2. In Advanced Encryption Standard all operations are
performed on __________
bytes.

32 bits - CORRECT ANSWER✅✅7. Key sizes of __________ or less are now
considered to be inadequate

128 bits - CORRECT ANSWER✅✅10. In the AddRoundKey transformation the 128
bits of State are bitwise XORed with the ___ of the round key.

AddRoundKedy - CORRECT ANSWER✅✅6. The AES cipher begins and ends with
a(n) _________ stage because any other stage,
applied at the beginning or end, is reversible without knowledge of the key and
would add no security.

Asymmetric encryption - CORRECT ANSWER✅✅1. Is the most common method used
to conceal small blocks of data, such as encryption keys and hash function values,
which are used in digital signatures

Asymmetric encryption - CORRECT ANSWER✅✅8. Public-key encryption is also
known as ___________ .

Asymmetric Keys - CORRECT ANSWER✅✅2. are two related keys, a public key and a
private key that are used to perform complementary operations, such as encryption and
decryption or signature generation and signature verification.

, Authenticity - CORRECT ANSWER✅✅6. Verifying that users are who they say they
are and that each input arriving at the system came from a trusted source is

Availability - CORRECT ANSWER✅✅A(n) __________ service is one that protects a
system to ensure its availability and addresses the security concerns raised by denial-
of- service attacks.

Avalanche Effect - CORRECT ANSWER✅✅1. The __________ is when a small
change in plaintext or key produces a large change
in the ciphertext

binary curve - CORRECT ANSWER✅✅1. For a ___________ defined over GF(2m),
the variables and coefficients all take on values in GF(2m) and in calculations are
performed over GF(2m).

Block - CORRECT ANSWER✅✅4. The vast majority of network-based symmetric
cryptographic applications make use of ____ ciphers.

Block - CORRECT ANSWER✅✅5. A _______cipher is one in which a block of
plaintext is treated as a whole and used to produce a ciphertext block of equal length

both confidentiality and authentication - CORRECT ANSWER✅✅7. Asymmetric
encryption can be used for __________ .

Brute force - CORRECT ANSWER✅✅5. A __________ attack involves trying every
possible key until an intelligible translation of the ciphertext is obtained

CBC, CFB - CORRECT ANSWER✅✅7. The ___ and __block cipher modes of
operation are used for authentication.

Cipher Feedback Mode - CORRECT ANSWER✅✅4. The output of the encryption
function is fed back to the shift register in Output Feedback mode, whereas in __the
ciphertext unit is fed back to the shift register.

Ciphertext - CORRECT ANSWER✅✅8. In the first instance of multiple encryption
plaintext is converted to __________
using the encryption algorithm.

Confidentiality - CORRECT ANSWER✅✅5. A loss of __________ is the unauthorized
disclosure of information

Consistency - CORRECT ANSWER✅✅7. The best that can be done to determine if a
PRNG generates numbers that have the characteristic of randomness is on the basis of