Michał Zalewski - Polish "White Hat" Hacker, computer security expert.
In 2011, Zalewski authored The Tangled Web: A Guide to Securing Modern Web Applications, also published by No Starch Press.
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In 2005, Zalewski authored Silence on the Wire: A Field Guide to Passive Reconnaissance and Indirect Attacks, a computer security book published by No Starch Press and subsequently translated to a number of languages.