GnuPG

GnuPG, or GNU Privacy Guard, is a free software tool that allows individuals to securely encrypt and sign their communications and files. It protects privacy by encoding information so that only intended recipients can read it. GnuPG uses a system of private and public keys; a public key is shared for others to send encrypted messages, while the private key is kept secret to decode them. Additionally, it ensures the integrity of messages by enabling digital signatures, verifying that the sender is genuine and the message hasn’t been altered. GnuPG is widely used for email and file security.