MATCHING
-an older protocol composed of a 16-round Feistel network with XOR functions,permutation functions,64 S-box functions,and fixed key schedules
A)AES
B)block cipher
C)ciphertext
D)cryptanalysis
E)DES
F)XOR function
G)IPsec
H)key management
I)plaintext
J)stream cipher

Question

Quizplus · Accepted Answer

The protocol described is the Data Encryption Standard (DES), which is an older block cipher composed of a 16-round Feistel network with XOR functions, permutation functions, 64 S-box functions, and fixed key schedules.

Answer: B 
 A block cipher is a type of symmetric encryption algorithm that operates on fixed-length blocks of data, such as 64-bit blocks used in DES.

Answer: F 
 XOR function is used in the DES to combine the plaintext with the key to create the ciphertext.

Answer: I 
 Plaintext refers to the original message that needs to be encrypted in the DES.

Answer: H 
 Key management refers to the process of generating, exchanging, and storing keys used in encryption algorithms such as DES.

Note: AES, ciphertext, cryptanalysis, IPsec, and stream cipher are not related to the protocol described.

MATCHING -An Older Protocol Composed of a 16-Round Feistel Network with with XOR