Watchguard Firebox X1000 Reference Manual page 137

Reference Guide
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IANA (Internet Assigned Number Authority)
The central authority charged with assigning parameter values to
Internet protocols. For example, IANA controls the assignment of
well-known TCP/IP port numbers. Currently IANA manages
port numbers 1 through 1023.
ICMP (Internet Control Message Protocol)
A protocol used to pass control and error messages back and forth
between nodes on the Internet.
identity certificate
A signed statement that binds a key to the name of an individual
and therefore delegates authority from that individual to the
public key.
IDS
See Intrusion Detection System.
IETF
See Internet Engineering Task Force.
IKE (Internet Key Exchange)
A protocol used with IPSec virtual private networks. Automates
the process of negotiating keys, changing keys, and determining
when to change keys.
implicit trust
A condition reserved for pairs located on a local keyring. If the
private portion of a key pair is found on a user's keyring, PGP
assumes that user is the owner of the key pair and implicitly trusts
himself or herself.
initialization vector
A block of arbitrary data that serves as the starting point for a
block cipher using a chaining feedback mode. See also cipher block
chaining.
initialize
To prepare a disk for information storage.
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