I am not sure if anyone here can help me, but I am getting migraines from attempting to create an encryption method that suits my needs. I tried looking at VB.Net's built in TripleDES, MD5, etc...My problem is that those methods encrypt string into unreadable text. I tried converting the encrypted text to Hex, but that instantly doubles the string size, which is unacceptable.

I am trying to create an encryption method that ends up returning only Digits and Alpha Characters, which then I can use for "Application Licensing." Inside the "License" I am looking to embed certain information, but the license needs to be in readable/typable format for the enduser to key in. I also need it to be a 1:1 ratio, in other words the string outputed by the encryption method is the same size as the string inputted. I tried creating my own Transposition Matrix and Encryption method using it which I was able to get working, but "decrypting" ended up being a disaster. It's easier to scamble information then it is to unscramble it. :-)

Can anyone help me? Either directing me to some samples if possible, or maybe I can post the code that I have and maybe get some help on how to fix it?