Dictionary of Information Security

characteristics include the identities and locations of

the source(s) and destination(s), and the presence,

amount, frequency, and duration of occurrence. Also,

analysis of pizza deliveries to the Pentagon.

traffic padding generation of spurious instances of com-

munication, spurious data units, and/or spurious

data within data units, intended to defeat traffic

analysis. (The CIA orders pizza even when nothing

is going on.)

tranquility security model rule stating that the security level

of an object cannot change while the object is being

processed by a system. Also, a state never achieved by

a security practitioner.

transponder transmitter that only operates having received

(and usually been powered by) a radio signal. Most

“contactless” identity cards ...