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Rotor cipher machines - PowerPoint PPT Presentation

Classical Encryption Techniques

Classical Encryption Techniques. As opposed to modern cryptography Symmetric-key. Symmetric Cipher Model. Brute-Force Attack. Try every key to decipher the ciphertext. On average, need to try half of all possible keys Time needed proportional to size of key space. Classical Ciphers .

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Rotor cipher machines - PowerPoint PPT Presentation

Classical Encryption Techniques