Bit permutations - PowerPoint PPT Presentation

Number Systems

Number Systems. Binary Decimal Hexadecimal. Bits, Bytes, and Words. A bit is a single binary digit (a 1 or 0). A byte is 8 bits A word is 32 bits or 4 bytes Long word = 8 bytes = 64 bits Quad word = 16 bytes = 128 bits

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Simplified DES

Simplified DES. Cryptography and Network Security. Reference: Sec 3.1 of Stallings Text. Components of DES. Key generation Bit permutations S-boxes Bit Rotations and exclusive-or operations. Simplified DES. Key: 10 bits Generates two 8-bit keys Plaintext and ciphertext: 8 bits

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375 views • 10 slides

Simplified DES

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136 views • 10 slides

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