For the past three years, the uptake of smartcard technology has been hindered by the discovery of a number of non-invasive attacks. In these attacks, a modified terminal device can extract cryptographic key material from a smartcard by observing the details of the transaction timing or power consumption, or by inserting spurious signals into the power or clock lines. The publicity generated by some of these attacks, such as differential power analysis, has seriously eroded confidence in smartcards. Rendering such attacks obsolete requires novel circuit techniques and we believe that self-timed circuits have a key role to play.
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