Classical Ciphers Pdf Cipher Cryptography Attacks to cryptosystems. classical cryptographic techniques and algorithms. one time pad, randomness and pseudo randomness mathematical foundations: number theory. finite fields. primitive roots. square roots. exponentiation and discrete logarithm. secret key cryptography: block ciphers and stream ciphers. des, aes (rijndael). modes of operation. 1. the document discusses classical ciphers such as the shift cipher, affine cipher, and vigenère cipher. 2. it explains the basics of how each cipher works including encryption and decryption methods. 3. various attacks on the ciphers are also summarized such as ciphertext only, known plaintext, chosen plaintext, and chosen ciphertext attacks. frequency analysis is a common technique used to.
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