Gpg4win

GPG4Win is a free program that helps you encrypt and protect your data when you're sending it over a network or the Internet. It stands for Gnu Privacy Guard for Windows, and it uses something called public key cryptography to scramble your data before you send it. To put it simply, GPG4Win takes your data, jumbles it up, then keeps it jumbled up so that only the right people (who have the right "key") can put it back together again. It's like a scrambled puzzle that only the people you want to see it can figure out.