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Questions and Answers
Block ciphers process messages a bit at a time when encrypting/decrypting.
Block ciphers process messages a bit at a time when encrypting/decrypting.
False (B)
DES is a stream cipher.
DES is a stream cipher.
False (B)
DES uses a 56-bit key size.
DES uses a 56-bit key size.
True (A)
The encryption and decryption algorithms of DES are classified.
The encryption and decryption algorithms of DES are classified.
The DES single round structure uses two 16-bit L & R halves.
The DES single round structure uses two 16-bit L & R halves.
DES S-Boxes map 4 to 6 bits.
DES S-Boxes map 4 to 6 bits.
The 48-bit binary number is split up into 6 (8-bit) blocks.
The 48-bit binary number is split up into 6 (8-bit) blocks.
Each S-box extracts eight numbers from the binary number.
Each S-box extracts eight numbers from the binary number.
Triple DES uses two keys and two executions of the DES algorithm.
Triple DES uses two keys and two executions of the DES algorithm.
AES has a fixed block size of 128 bits.
AES has a fixed block size of 128 bits.
Blowfish has a variable key length ranging from 32 bits up to 448 bits.
Blowfish has a variable key length ranging from 32 bits up to 448 bits.
Cast-128 has a block size of 128 bits and a key size of 256 bits.
Cast-128 has a block size of 128 bits and a key size of 256 bits.
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