

This sees users create and publish public keys based on two prime numbers, which are required for anyone to decode, and use the message-digest algorithm (MD5) to create a hash code. Rivest-Shamir-Adleman (RSA): RSA is one of the first public-key cryptosystems, which encrypts a short key created using the International Data Encryption Algorithm (IDEA). There are two public key versions of PGP: The recipient uses the message sender’s public key to decrypt the hash, and if it matches that sent by the sender, then it confirms that the message was securely received. The hash code, which can be usernames and other digital data, is encrypted by the message sender’s private key. PGP uses efficient algorithms that create a mathematical summary known as a hash to send digital signatures.
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Both are sent to the recipient, who uses their private key to unlock the shorter key, then decrypt the full message. The public key is used to encrypt the shorter version that encrypted the full message. PGP compresses plaintext data, which saves on disk space and transmission time, as well as reinforces cryptographic security.

Later, it was standardized and supported by other applications such as email. It has now become a core standard in email security and has been widely used to protect individuals and organizations. Originally, it was used to enable individual users to communicate on bulletin board system computer servers.
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PGP was one of the first public-key cryptography software publicly available for free. PGP aims to solve this and enhance email security by encrypting the data to make the communication method more private. PGP software was owned and sold by a company called PGP Corporation, which was founded in 2002 then sold to Symantec in 2010.Įmail is a prime attack method for cyber criminals who can easily forge messages using a victim’s name or identity. PGP was first designed and developed in 1991 by Paul Zimmerman, a political activist. Pretty Good Privacy (PGP) is a security program used to decrypt and encrypt email and authenticate email messages through digital signatures and file encryption.
