See signal transfer point.

See signal transition.

1. A category of intelligence comprising, either individually or in combination, all communications intelligence, electronics intelligence, and foreign instrumentation signals intelligence, however transmitted. [JP 1-02]
2. Intelligence derived from communications, electronics, and foreign instrumentation signals. [JP 1-02]

[A] generic term encompassing communications security and electronic security. [NIS]

The entity that generates a digital signature on data. [After X9.31]

In secure communications, an agreed entity (usually a third party) that issues signatory certificates to organizations participating in this authorization system. [After X9.45]

In encryption, a certificate, issued by a signatory authority, that identifies the authorized signatories of an organization. [After X9.45]

1. The complete set of signals, usually electromagnetic or acoustic, received from a source such as an infrared object, a radio or radar transmitter, an aircraft, or a ship.
Note: Signatures may consist of analog or digital signals, or both, and may be analyzed to indicate the nature of their source and assist in its recognition.
2. The attributes of… (Read More →)

In the modulation of a carrier, one of the values of the signal parameter chosen to represent information.
Note 1: Examples of significant conditions are an electrical current, voltage, or power level; an optical power level; a phase value; or a frequency or wavelength chosen to represent a "0" or a "1"; or a "mark" or a "yyspace. "
Note… (Read More →)

In a representation of a number, a digit that is needed for a given purpose; in particular, a digit that must be kept to preserve a given accuracy or a given precision.