This article is thrown to those who can't encrypt email to me. By the way, please send it to twzmoe@gmail.com thank you

0x00 What is PGP?

"Pretty Good Privacy (PGP), an application for message encryption and verification, adopts IDEA
The hashing algorithm of is used for encryption and verification. The main developer of PGP is Phil Zimmermann. Zimmerman introduced PGP in 1991
Free release on the Internet. PGP itself is a commercial application; The open source tool with similar functions is called GPG (GnuPG). PGP and its similar products comply with
OpenPGP data encryption and decryption standard (RFC 4880). "—— From WikiPedia This article uses the branch GPG Suite of GunPG
To demonstrate.

The demonstration environment is OS X 10.11.6 (the reason why the macOS is not upgraded is that the software development environment does not want to change)

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