Chapter 5. Electronic mail security. Outline. Pretty good privacy S/MIME Recommended web sites. Pretty Good Privacy. Philip R. Zimmerman is the creator of PGP. PGP provides a confidentiality and authentication service that can be used for electronic mail and file storage applications.
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Electronic mail security
PGP source : http://www.pgp.com/developers/sourcecode/
See Table 15.2 (W. Stallings)
Class Identity Checks Usage
1 name/email check web browsing/email
2 + enroll/addr check email, subs, s/w validate
3 + ID documents e-banking/service access