Just as important as what's revealed each summer at the Black Hat hacker confab in Las Vegas may be what isn't. Among the talks conspicuously absent from this year's schedule: a presentation exposing security vulnerabilities in banks' high-speed trading systems.The talk, planned by security researchers Varun Uppal and Gyan Chawdhary, would have dealt with methods for hiding risky unauthorized trades in high-speed trading applications, as well as demonstrating a "sniffing" software tool capable of siphoning trading information to a faraway hacker to allow a high-tech form of real-time insider trading. But Uppal tells us that the talk has been cancelled after concerns were raised by a financial industry client of the security auditing firm he works for, Information Risk Management."One of our customers, a main Wall Street bank, wasn't comfortable with what we were presenting," says Uppal.

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