This document summarizes cryptography and cryptanalysis. It discusses: 1) Cryptography concepts like encryption, decryption, symmetric and asymmetric encryption algorithms. Symmetric algorithms include block and stream ciphers while asymmetric includes RSA. 2) Applications of cryptography in areas like the military, banking, and internet. 3) Cryptanalysis techniques like brute force attacks and chosen plaintext attacks used to break encryption. It provides an example of how the Enigma machine was broken during WWII.

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