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8 questions
DES follows
Hash Algorithm
Caesars Cipher
Feistel Cipher Structure
SP Networks
The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key
Data Encryption Standard (DES) uses a __________.
Stream Cipher
Bit Cipher
Block Cipher
Substitution Cipher
In the DES algorithm, although the key size is 64 bits only 48bits are used for the encryption procedure, the rest are parity bits.
True
False
In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.
a) 48, 32
b) 64,32
c) 56, 24
d) 32, 32
In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ____________
P-box
Expansion P-box
S- box
Expansion S-box
The number of unique substitution boxes in DES after the 48 bit XOR operation are
8
4
6
12
In the DES algorithm the 64 bit key input is shortened to 56 bits by ignoring every 4th bit.
True
False
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