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Introduction to AAA Server
RADIUS Overview
Chapter 1 7
Shared Secret
Encrypting the transmission of the User-Password in a request is
accomplished by a shared secret. The shared secret is used to sign
RADIUS data packets to ensure they are coming from a trusted source.
The shared secret is also used to encrypt user passwords with certain
authentication methods such as PAP. The HP-UX AAA Server uses the
clients configuration file to associate a secret to each client (or server)
that is authorized to make use of its services.