OpenPGP for application developers

A new book called OpenPGP for applicationdevelopers has been released under the Creative Commons BY-SA license.

This document is not intended for end-users or implementers ofOpenPGP libraries (or other software that directly handles internalOpenPGP data structures).

Instead, this document is focused on the second group, applicationdevelopers, who use OpenPGP functionality in their softwareprojects. It describes the properties of the OpenPGP system and itsuses. It presupposes solid knowledge of software developmentconcepts and of general cryptographic concepts. Thus, this textdescribes OpenPGP at the library-level," teaching concepts thatwill help software developers get started as a user of anyimplementation (e.g., OpenPGP.js, Sequoia-PGP).