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Alice and Bob do n't ( yet ) trust each other , but they do trust the KDC , which facilitates distributing the session key to both of them . His major contribution to creating Tri-Met was to basically bludgeon the business community into accepting the payroll tax for transit , but they were just building up cash balances because he wanted to get enough money to build the transit mall . " These measures will surely enhance public security , but they wo n't catch the next Mohamed Atta . At first , the FBI did not believe John Ellwood about Daniel involvement , but they continued to investigate . For this reason , mirrors are occasionally employed in place of lenses in complex optical instruments , but they cannot replace lens elements entirely because other mirror aberrations are more difficult , if not impossible , to correct .