Watchguard Firebox X1000 Reference Manual page 150

CHAPTER 9: Glossary
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PPTP (Point-to-Point Tunneling Protocol)
A VPN tunnelling protocol with encryption. It uses one TCP port
(for negotiation and authentication of a VPN connection) and one
IP protocol (for data transfer) to connect the two peers in a VPN.
Pretty Good Privacy (PGP)
An application and protocol (RFC 1991) for secure email and file
encryption. PGP uses a variety of algorithms, like IDEA, RSA,
DSA, MD5, SHA-1, for providing encryption, authentication,
message integrity, and key management.
primary key (IPSec)
An IPSec key responsible for creating a security association.
Values can be set in time or data size.
principle of precedence
Rules that determine which permissions and prohibitions
override which others when creating a combination of security
policies.
Privacy Enhanced Mail (PEM)
A protocol to provide secure Internet mail (RFC 1421-1424),
including services for encryption, authentication, message
integrity, and key management. PEM uses ANSI X.509 certificates.
private key
The privately held "secret" component of an integrated
asymmetric key pair, often referred to as the decryption key.
protocol
A set of formal rules describing how to transmit data, especially
across a network. Low-level protocols define the electrical and
physical standards to be observed, bit- and byte-ordering, and the
transmission and error detection and correction of the bit stream.
High-level protocols deal with the data formatting, including the
syntax of messages, the terminal-to-computer dialog, character
sets, and sequencing of messages.
public key
The publicly available component of an integrated asymmetric
key pair, often referred to as the encryption key.
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