PRNG permanent compromise attack

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A type of PRNG state compromise extension attack in which an attacker compromises the state of the PRNG at some arbitrary time t. From t, all future and past states of the PRNG become vulnerable to attack [1].


In 1999, Reliable Software Technologies was able to crack the card shuffling algorithm used in an online Texas Hold 'Em card game (using software developed by ASF Software Inc.). By identifying the seed value used by ASF's PRNG algorithm, Reliable was able to identify how the cards would be shuffled and, hence, the contents of the deck [2].

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