Pretty Good Privacy (PGP) is a computer program and encryption scheme designed to provide secure communication and data privacy. It was developed by Phil Zimmermann in 1991 as an easy-to-use and efficient method for encrypting and decrypting electronic messages and files. PGP utilizes a combination of symmetric-key encryption, public-key encryption, and hashing algorithms to ensure the confidentiality, integrity, and authenticity of data exchanged between users.
The program's primary goal is to enable individuals and organizations to communicate privately and securely over the internet. PGP utilizes a system of public and private keys, where each user has a unique pair of keys. The public key is openly shared, allowing anyone to send encrypted messages to the user, while the private key is kept secret, allowing only the user to decrypt messages intended for them.
PGP employs a hybrid encryption scheme, where a session key is generated and used to encrypt the actual message. This session key is then encrypted using the recipient's public key, ensuring that only the intended recipient can decrypt and read the message.
In addition to encryption, PGP also provides digital signature functionality. Users can sign their messages with their private key, allowing recipients to verify the authenticity and integrity of the message using the sender's public key.
Overall, Pretty Good Privacy is a widely recognized and trusted encryption software that offers secure communication and data privacy, serving as a vital tool for individuals and organizations seeking to protect their sensitive information from unauthorized access.
