Days before that she gave a talk on legal issues faced by Internet service providers (ISP) at the Black Hat Briefings, a more serious set of meetings for security professionals and law enforcement officials that precedes the more festive Def Con.

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But apps written to the protocol can be vulnerable to denial-of-service, session hijacking, and man-in-the middle attacks over the Internet, as well as an attacker actually able to "watch" the transactions, says David Goldsmith, CEO of Matasano Security, who will present the firm's new research on FIX at the upcoming Black Hat USA briefings later this month.

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