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Block Ciphers (CAST 128 (Sub-key Size (Rotation-5bits, Masking-32 bits),…
Block Ciphers
DES 
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PROCEDURE
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- Use of Round Key:(48 bits).
- Splitting: Each six bit value is passed into an S-box to produce a four bit result in a nonlinear
way.
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IDEA
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encrypts 64-bit plaintext to 64-bit
ciphertext blocks, using a 128-bit input key K.
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CAST 128
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Operations Used
modulo add,modulo subtract,xor,shift
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TEA
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64 bit block, 128 bit key.
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Fast, low memory requirement
RC5
Encryption can be described by the following pseudo-code,where the input block is
(A,B):
Where A and B are w-bit halves of the state, r is the number of rounds, and b is the
number of bytes in the key
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