Timing Cryptanalysis Attack

[Armadillo Remailer]

Simon Spero <ses at tipper.oit.unc.edu> writes:

>My gut & scribble-on-the-back-of-a-napkin feeling about this class of
>attack is that it could be a problem for smartcards (almost certainly)

Is it a problem to create smartcards that do their calculations in
fixed time? I'd guess it should be easier than on multi-purpose
hardware.

Does the attack work for existing smartcards?