Philip Zimmermann Books

PGP: Source Code and Internals

By Philip Zimmermann

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The Official PGP User's Guide

By Philip Zimmermann

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"The Official PGP User's Guide" is the user's manual for PGP (Pretty Good Privacy) public-key cryptography software, freely available over the Internet, that has become the de facto standard for th...

High Tension

By Philip Zimmerman, Philip Zimmermann

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Long story short

By Philip Zimmermann

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Pretty good privacy 3.0 pre-alpha source code, preliminary release 1.1

By Philip Zimmermann

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Armut und Bischofsherrschaft

By Zimmermann Philip Historian

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"Die vorliegende Studie fragt nach dem frühmittelalterlichen Verständnis von Armut und untersucht insbesondere die Armenfürsorge der Bischöfe der Merowingerzeit. Durch Herausarbeitung der religiöse...

Barri de Ribera el

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Sanctus Sonorensis

By Philip Zimmermann

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Swamp Monsters

By Philip Zimmermann, Mike Slack

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Melt

By Philip Zimmermann

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.