SRL Archive - Mathematics

So I'm doing this presentation about Cryptography tomorrow.. I've made a lil test with some simple encoding/decoding questions. However I ran out of creative ideas.

So, do you know a simple crytpographic algorithm please post..

^ Can range from literally reversing a string to doing simple methods like ROT13.
(no RSA shit, aint going into cryptography that deep)

Caesar Cipher perhaps? http://en.wikipedia.org/wiki/Caesar_cipher
I guess it's a bit like ROT13, but more general.
More: http://en.wikipedia.org/wiki/Transposition_cipher

The ADFGVX cipher is really really easy to explain, but was pretty effective for its original purposes.

From: Markus
The ADFGVX cipher is really really easy to explain, but was pretty effective for its original purposes.

Yes, it is indeed easy to explain.. However after explaining like 5 other methods, people might get confused :redface:

If you already have that many methods, maybe you would be better off to expand upon them rather than introducing more?

Maybe talk about credit cards and all that? People use it daily and generally don't know how it works.. I find it quite interesting. :>