TFS Encryption protects and secures e-mail communication. When a message is sent through TFS Gateway™, TFS Encryption can be used not only to encrypt the message, but more importantly to digitally sign the message. Encryption protects the message from unauthorized reading. A digital signature makes it possible for the receiver to verify that it is the correct sender and that the message has not been tampered with. TFS Encryption also decrypts incoming encrypted messages and verifies the sender's digital signature.