In addition he said that 22 of the 49 internet protocol (IP) addresses involved in the incidents matched those used in attacks blamed on the North over the past five years.

BBC: Cyber researcher in Seoul

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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