a Pictorial Guide to Cryptography

with Stories, Analogies and Meaningful Pictures

Since cryptography you need to know infrequently changes * . . .,
 learning how crypt protects your data & keys will likely serve you a lifetime.

Free stuff

printable book chapters §

separate links to our software/ videos/ puzzles→www.docrypt.com

* Without doubt, cryptography's most important change was the discovery of public/private key technology in the 1970s (wiki history)
That discovery took 1,000s of years (no typo). Centuries old secret key crypto methods are used in today's computer cryptography.

§ Addison-Wesley Pearson Ed Corp. has given us permission to post our book They request we include the following:

All rights reserved. No part of this publication may be reproduced, or transmitted in any form, or by any means electronic, mechanical, photocopying, recording, or otherwise, without prior consent of the publisher. Pearson Education 617 848 7047.