(PGP (PrettyGoodPrivacy), is a mail encryption software based on RSA public key encryption system. It can be used to keep the mail confidential to prevent unauthorized persons from reading it, and it can also add a digital signature to the mail so that the recipient can recognize the sender of the mail and be confident that the mail has not been tampered with. It can provide a secure method of communication without requiring any secure way to pass the key in advance. It adopts a hybrid algorithm of RSA and traditional encryption, mail digest algorithm for digital signature, compression before encryption, etc. It also has an outstanding ergonomic design. It's powerful and fast. And its source code is free.)
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