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The document discusses classical cryptosystems including the shift cipher, substitution cipher, and Vigenère cipher. The shift cipher replaces each letter with the letter a fixed number of positions down the alphabet. Substitution ciphers replace each letter with a substitute letter according to a key. The Vigenère cipher uses a repeating keyword to shift letters by different amounts throughout the plaintext, making it more secure than monoalphabetic ciphers. Frequency analysis and techniques like the Kasis
- Author
- Amany Morsey
- Language
- EN