Fileprivacy easily encrypts your files
Java code that enables you to sign documents using a smart card.
A simple example of polyalphabetic cipher in Java.
A java-based interceptor for SSL/TLS protocol
jEncrypt is a command line file encryption archiver
textcrypter is an encryption tool using vigenere cipher algorithm
rsa-elgamal comparison
TCP/IP API (SSL Encryption, ZLIB Compression)
Software para assinar arquivos no formato PKCS7