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History and Background

Why is History Important?. Most modern encryption algorithms based on concepts hundreds/thousands of years oldMost attacks on encryption also very oldExhaustive searchCryptographic analysis. Substitution Algorithms. Mapping of plaintext to ciphertextCan be single character mapping (historical)

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History and Background

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    1. History and Background CSIS 5857: Encoding and Encryption

    2. Why is History Important? Most modern encryption algorithms based on concepts hundreds/thousands of years old Most attacks on encryption also very old Exhaustive search Cryptographic analysis

    3. Substitution Algorithms Mapping of plaintext to ciphertext Can be single character mapping (historical) A ? G Can map entire blocks of plaintext (modern block ciphers) 1001011001111100 ? 0110101011100011

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