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Cryptography, for Fun and Profit
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Synopsis What is Cryptography? Some simple cryptographic systems and a modern application. An unbreakable cipher. Some modern algorithms (survey) Practical use of cryptography Some uses of cryptography.
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What is Cryptography?
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Worst case conditions. The cryptanalyst has complete knowledge of the cipher system The cryptanalyst has a considerable amount of ciphertext The cryptanalyst knows the plaintext equivalent of a certain amount of some ciphertext.
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Some simple cryptographic systems and a modern application. Caesar cipher. A modern application: rot13. Vigenere ciphers Scrambling/transposition Steganography Main concept: modular arithmetic
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An unbreakable cipher. One-time-pad Perfect secrecy
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Some modern algorithms (survey) Bit strings Blocks DES AES Diffie-Hellman RSA
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Practical use of cryptography Be realistic
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Some uses of Cryptography Confidentiality Integrity Entity authentication Source authentication Non-repudiation Certification Authorities Data safeguarding and hijacking.
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