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Pretty Good Privacy, commonly known as PGP, is an encryption program that provides cryptographic privacy and authentication for data communication. It is widely used for securing emails, files, and digital signatures. The main objective of PGP is to ensure that information exchanged over insecure networks such as the internet remains confidential, authentic, and tamper-proof. Developed by Phil Zimmermann in 1991, PGP quickly became popular because it offered strong encryption to ordinary users at a time when such tools were largely restricted to government and military use. The foundation of PGP lies in the combination of two cryptographic techniques: symmetric key encryption and public key encryption. Symmetric encryption uses a single key to both encrypt and decrypt data, making it fast and efficient for handling large amounts of information. However, distributing the same key securely to both sender and receiver is challenging. Public key encryption, on the other hand, uses __________ _______ ______ _________ _________.
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