The public key can be shared with anyone, while the private key should be protected and secret to maintain the integrity of the system. Public-key cryptography uses a key-pair system where any single user has a private and public key pair. Public key cryptography is likely already familiar to you since it is the recommended way to authenticate when GPG uses a combination of symmetric-key cryptography and public-key cryptography. This piece of free software is notably used by journalists around the world to ensure that their sensitive email communication is kept secure and private. OpenPGP protocol, which defines and standardizes all the necessary components involved in sending encrypted messages–signatures, private keys, and public key certificates. GNU Privacy Guard (GnuPG), also known as GPG, is a tool for secure communication that was created by Werner Koch as
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