PGP and Kerberos
Authentication allows the recipient of a digital signal to have confidence in the integrity of the sender and the message. Authentication protocols can be based on either conventional private-key encryption systems like DES or on public-key systems like RSA. Authentication in public-key systems uses digital signatures.
PGP
Pretty Good Privacy (PGP) is a unique product in that it serves the dual role of a powerful encryption package and a sophisticated authentication package. PGP was written by Phil Zimmerman in 1990, using the RSA algorithm for encryption. Since then, PGP has attained popularity as a powerful encryption program for email and has become the de facto standard. PGP is considered to be strong encryption.
PGP uses ...
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