Question

A variation of the Feistel network called an ______________ cipher. They use a modified structure where L0 and R0 are not of equal lengths. This means that L0 might be 32 bits and R0 could be 64 bits (making a 96-bit block of text). This variation is actually used in the Skipjack algorithm. A) Asymmetric

B) Unbalanced Feistel

C) Homophonic

D) Orthogonal

Answer 1

An Unbalanced Feistel cipher is a variation of the Feistel network used in encryption where the initial left and right block sizes are not equal, as exemplified by the Skipjack algorithm.

Step-by-step explanation:

A variation of the Feistel network called an Unbalanced Feistel cipher is used when the block sizes of L0 and R0 are not of equal lengths such as in the Skipjack algorithm where L0 might be 32 bits and R0 could be 64 bits creating a 96-bit block of text. Unlike symmetric Feistel networks, unbalanced Feistel ciphers do not require the halves of the processed blocks to have the same size which can offer advantages in terms of flexibility and security.

For example, the transposition cipher a different cryptographic technique, reorders the letters in the plaintext based on a rule like a keyword, creating scrambled text in blocks but it maintains symmetry in the size of blocks.