Audit Information systems & IT Security
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Audit Information systems & and IT Security

Information System audit and IT Security

Definitions and Terminology

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keystream generator



state-based process (i.e. a finite state machine) that takes as inputs a key, an initialization vector, and if necessary the ciphertext, and that outputs a keystream, i.e. a sequence of bits or blocks of bits, of arbitrary length.

source: ISO18033-4, 2005



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