Slides by Kent Seamons and Tim van der Horst Last Updated: Oct 8, 2012.

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Slides by Kent Seamons and Tim van der Horst Last Updated: Oct 8, 2012

Goals  Be able to describe how secure works to provide confidentiality, integrity, and authentication  Understand the different in trust models between PGP S/MIME  Gain experience using secure

PGP Background  Designed by Phil Zimmerman Originally designed as a human rights tool Published for free on the Internet in 1991 Phil was the target of a three year criminal investigation  Where to get PGP? ○ pgp.com ○ GnuPG (GPG)  In the 1990’s, one way to skirt federal export controls was to publish the source code in book form (this was allowed), ship the books to Europe, scan the source code using OCR technology to create the code. Laborious, but legal.  Trust model – web of trust

S/MIME  Secure Multipurpose Internet Mail Extension  Security extension to the MIME Internet format  What is the trust model? Hierarchical, top-down X.509 certificates

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