Science: A New Way to STK Up Banks

With a wiretap, a computer and a little guile

It seemed harmless enough. The Britain-based Computer Fraud & Security Bulletin sponsored a "Think Like a Thief contest, encouraging readers to compete for a £100 ($215) prize by inventing plans for a computer-related fraud. But now there are international repercussions. In his winning entry, published in the Bulletin, Leslie Goldberg pinpointed an apparently fatal flaw in a new security technique recently proposed by major British banks and being considered by their foreign counterparts.

Goldberg, a London computer security expert, had been analyzing the new system, which is called the Standard Test Key (STK). Like...

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