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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
DES is a stream cipher.
DES is a stream cipher.
False
DES uses a 56-bit key size.
DES uses a 56-bit key size.
True
The encryption and decryption algorithms of DES are classified.
The encryption and decryption algorithms of DES are classified.
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The DES single round structure uses two 16-bit L & R halves.
The DES single round structure uses two 16-bit L & R halves.
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DES S-Boxes map 4 to 6 bits.
DES S-Boxes map 4 to 6 bits.
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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.
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Each S-box extracts eight numbers from the binary number.
Each S-box extracts eight numbers from the binary number.
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Triple DES uses two keys and two executions of the DES algorithm.
Triple DES uses two keys and two executions of the DES algorithm.
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AES has a fixed block size of 128 bits.
AES has a fixed block size of 128 bits.
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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.
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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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