Watchguard Firebox X1000 Reference Manual page 147

Reference Guide
Packet filtering is one technique, among many, for implementing
security firewalls.
passive mode FTP
See active mode FTP.
passphrase
An easy-to-remember phrase used for better security than a single
password; key crunching converts it into a random key.
password
A sequence of characters or a word that a user submits to a system
for purposes of authentication, validation, or verification.
password caching
The storage of a user's username and password in a network
administrator database or encrypted file on a computer.
Password Authentication Protocol (PAP)
An authentication protocol that allows PPP peers to authenticate
one another. It does not prevent unauthorized access, but
identifies the remote end.
PCI (peripheral component interconnect)
A unique network interface card slot on the motherboard of a
computer.
PCMCIA (Personal Computer Memory Code International
Association) card
A standard compact physical interface used in personal
computers. The most common application of PCMCIA cards is for
modems and storage.
perfect forward secrecy (PFS)
A cryptosystem in which the cipher text yields no possible
information about the plain text, except possibly the length.
PEM
See Privacy Enhanced Mail.
peer-to-peer
A network computing system in which all computers are treated
as equals on the network.
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