INTRODUCTION TO CRYPTANALYSIS AND PUBLIC KEY CRYPTOGRAPHY

Cryptanalysis is the process of finding a shortcut method not

envisioned by the designer for decrypting an enciphered message

when the key used to encrypt the message is not known.

This report discusses three methods of cryptanalysis:

Chosen-plaintext attack

Known-plaintext attack

Ciphertext-only attack.

Public key cryptography, developed within the last two decades for

commercial use, has become an exciting technology for the communications industry, as wired and wireless voice, data, and image

networks continue to proliferate and interconnect.

This report introduces two types of public key cryptography:

Diffie-Hellman Exchange Algorithm

Rivest-Shamir-Adleman (RSA) Algorithm

The report also introduces two conventional cryptosystems:

Vernam cipher

US Data Encryption Standard (DES)

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