AcknowledgmentsWe are grateful to Steve White and Dave Chess for several useful lunchtime and hallway conversations, from which the idea of an automatic signature extractor grew. Steve's first efforts goaded us into developing something a little more sophisticated. Dave's constant complaints about the functioning of the signature extractor/evaluator have helped to improve its performance greatly. We are also grateful to Greg Sorkin for new insights into how to improve the performance of the signature extraction algorithm, particularly in the case of compiled viruses, and for his invention of many of the automatic virus analysis techniques that will be incorporated into the computer immune system.
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