SSCP · Question #680
The Data Encryption Algorithm performs how many rounds of substitution and permutation?
The correct answer is B. 16. The Data Encryption Standard (DES), also known as the Data Encryption Algorithm (DEA), performs 16 rounds of substitution and permutation on the plaintext during encryption.
Question
The Data Encryption Algorithm performs how many rounds of substitution and permutation?
Options
- A4
- B16
- C54
- D64
How the community answered
(25 responses)- B92% (23)
- C4% (1)
- D4% (1)
Why each option
The Data Encryption Standard (DES), also known as the Data Encryption Algorithm (DEA), performs 16 rounds of substitution and permutation on the plaintext during encryption.
4 rounds is insufficient for the security requirements of DES and is not the standard number of rounds.
The Data Encryption Standard (DES), referred to as the Data Encryption Algorithm (DEA), is a block cipher that operates on 64-bit blocks of data. It performs a sequence of 16 identical rounds, with each round involving substitution (S-boxes) and permutation (P-boxes) operations, combined with a subkey derived from the main key.
54 rounds is not the specified number of rounds for the DES algorithm.
64 rounds is not the specified number of rounds for the DES algorithm; 64 is the block size in bits.
Concept tested: DES/DEA number of rounds
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