## Cryptography: A brief history of secrecy

*Roel Willems*

In the first part of this talk I will give a brief and far from complete overview of the cryptosystems used through the centuries and some of the mathematics behind it. For example the Caesar cipher, the Vigenère cipher, Enigma, Diffie-Hellman, RSA and elliptic curve cryptography.

In the second part I will discuss Moh's *Tame Transformation Method*, which is a public key cryptosystem, using tame polynomial automorphisms over *F _{2}*.