The GNU Privacy Guard (GPG) package—a free alternative to the Pretty Good Privacy (PGP) cryptographic suit of utilities—is used to encrypt and decrypt files. With GPG, you can send an encrypted file to colleagues or friends, who can then decrypt it, provided they have the correct key. To encrypt and decrypt files, GPG uses a pair of keys: one private key and one public key. You use the public key for encryption. You can freely distribute this key to friends and colleagues ...

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