Cryptographic Software, including: Pretty Good Privacy, Secure Shell, Gnu Privacy Guard, Decss, Stunnel, Hushmail, Enigmail, Openssl, Filevault, ... Crosscrypt, Ciphersaber, Truecrypt, E4m

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More info: Encryption software is software whose main task is encryption and decryption of data, usually in the form of files on (or sectors of) hard drives and removable media, email messages, or in the form of packets sent over computer networks.