Gpg4win is an interesting free software application that allows you to encrypt files and emails using a public/private key system.

The encryption algorithm used by this program is also free and called “GNU Privacy Guard”, an open-source alternative to proprietary encryption systems.

Gpg4win will create both keys based on the parameters you provide. To operate the program, you need to know the recipient’s public key.

The operations are: The information is encrypted with the recipient’s public key, and when the recipient receives the document, they use their private key to decrypt it.

This program installs a plug-in for the “MS Outlook” mail client and allows you to encrypt your messages from the interface of this application.