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Classical Ciphers

Classical Ciphers. CSCI 284/162 Spring 2009 GWU. Formal definition: cryptosystem. A cryptosystem consists of: P set of all plaintext C set of all ciphertext K set of all keys E set of encryption rules, e K : P ? C D set of decryption rules d K : C ? P d K e K (x) = x

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548 views • 39 slides

Classical Ciphers

Classical Ciphers. CSCI 284/162 Spring 2008 GWU. Formal definition: cryptosystem. A cryptosystem consists of: P set of all plaintext C set of all ciphertext K set of all keys E set of encryption rules, e K : P ? C D set of decryption rules d K : C ? P d K e K (x) = x

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484 views • 39 slides

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Digrams trigrams - PowerPoint PPT Presentation

Classical Ciphers

Classical Ciphers