If you need PGP encryption C#, this is a FIPS Compliant Library to Encrypt/Decrypt files or streams with PGP using a single line of code. It also has the ability to generate public and private key pairs. It supports PGP Version 2 or PGP Version 3. It has the ability to output to ASCII by using ASCII Armor. It is compatible with GPG4Win, PGP Command Line, Symantec Desktop, and File Assurity. There are both synchronous and asynchronous methods.