JavaScrypt: Browser-Based Cryptography Tools

http://www.fourmilab.ch/javascrypt/

Creating an Encryption Utility in C#

http://www.programminghelp.com/programming/dotnet/creating-an-encryption-utility-in-c/

JavaScript Encryption

http://javascript.about.com/library/blencrypt.htm

Simple encrypting and decrypting data in C#

http://www.codeproject.com/KB/security/DotNetCrypto.aspx

Secure transaction with Javascript

Have you ever wanted to secure your client server connection without relying on HTTPS (well it does not replace HTTPS though..)
Here is a wonderful implementation using Javascript and C#

http://www.codeproject.com/KB/tips/JocysComJavaScriptClasses.aspx