Lesson 1- Foundation of Cryptology

The document provides an overview of cryptography and cryptanalysis. It discusses the history and foundations of cryptology, including definitions of key terms. Symmetric and asymmetric encryption algorithms are described, such as DES, AES, RSA, and their uses of secret or public keys. The importance of key size for encryption strength is also noted. Cryptographic methods like substitution, transposition, XOR, Vernam, and hash ciphers are outlined.