Pgp: Source Code and Internals cover
Pgp: Source Code and Internals
by Philip R. Zimmermann
ISBN: 0262240394
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daxelrod · 2016-11-30 · Original thread
I haven't read it, but "PGP: Source Code and Internals", by PGP's author Philip Zimmerman is worth a try. I've read his other book "Official PGP User's Guide" and learned quite a bit.

https://www.amazon.com/PGP-Internals-Philip-R-Zimmermann/dp/...