NETWORK SECURITY
CONFIDENTIALITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the DES algorithm the round key is ____ bit and the Round Input is ____ bits.
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48, 32
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64, 32
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56, 24
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32, 32
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Explanation:
Detailed explanation-1: -5. In the DES algorithm the round key is bit and the Round Input is bits. Explanation: The round key is 48 bits. The input is 32 bits.
Detailed explanation-2: -So the effective key length is 56 bits. DES consists of 16 “rounds”. Each round uses a roundkey, also called a subkey, derived from the main key.
Detailed explanation-3: -The DES (Data Encryption Standard) algorithm is a symmetric-key block cipher created in the early 1970s by an IBM team and adopted by the National Institute of Standards and Technology (NIST). The algorithm takes the plain text in 64-bit blocks and converts them into ciphertext using 48-bit keys.
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