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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His father says his son was a happy-go-lucky session man, but in the week after he started taking Chantix he became combative over what used to be minor business details.

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"Many of the systems we have built for authentication and session maintenance assume no man-in-the-middle attack, " he said.

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Meanwhile, British reigning world champions Nicola Minichiello and Gillian Cooke had a mixed training session ahead of the women's two-man bobsleigh event, which starts on Wednesday (0100 GMT).

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But his hopes appear to have faded after he was the slowest man out on the soaking Interlagos surface once the second session restarted following a 70-minute delay due to horrendous weather.

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If you're lucky, Dan Hawkins may even make an appearance on your record, with Norfolk-based act Magnet Man already receiving the pleasure of the renowned guitarist walking in on his session.

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