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Audit Information systems & and IT Security

Information System audit and IT Security

Definitions and Terminology

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keystream


pseudorandom sequence of symbols, intended to be secret, used by the encryption and decryption algorithms of a stream cipher. If a portion of the keystream is known by an attacker, then it shall be computationally infeasible for the attacker to deduce any information about the remainder of the keystream.

source: ISO18033-1, 2005

pseudorandom sequence of symbols, intended to be secret, used by the encryption and decryption algorithms of a stream cipher. If a portion of the keystream is known by an attacker, then it shall be computationally infeasible for the attacker to deduce any information about the remainder of the keystream. [ISO/IEC 18033-1:2005]

source: ISO18033-4, 2005


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