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Modern Block Ciphers

Modern Block Ciphers. CSIS 5857: Encoding and Encryption. Block Ciphers. Encrypting one bit at a time ineffective (only one possible substitution: 1 ? 0, 0 ? 1) Must map one block of plaintext bits to ciphertext Example: 11010010 ? 01101011 Key question: Good block size

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Example of linear cryptanalysis

Example of linear cryptanalysis. We shall apply linear cryptanalysis against a block cipher based only on applying a fixed permutation to each block and XOR of each block with a fixed binary array. Suppose the following known plaintext blocks 0000 1000 1100 0110 1111

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Known plaintext - PowerPoint PPT Presentation

Modern Block Ciphers

Example of linear cryptanalysis