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6th Semester
CY-603 (B)
Unit 1 Notes

CY-603 (B) Applied Cryptography Unit 1 Notes

Notes and important questions for unit 1: History and Classical Cryptography.

Unit 1 · Short notes History and Classical Cryptography History of cryptography · Background in probability and algorithms · Classical cryptography: shift cipher, monoalphabetic substitution cipher, polyalphabetic substitution cipher · Encryption with perfect secrecy and one‑time pad · Implementation aspects: shared secret randomness vs perfect secrecy · Modern cryptography principles: one‑way functions, trapdoor functions, hard‑core bits

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