A synchronous password token must keep up with the receiver's speed. To put it another way, the token must proceed to the next random number at the same time as the recipient. The two units will not always be exactly aligned due to clock imprecision; for example, the token's clock can operate 1 second every day slower than the receiver's. The cumulative disparity may be important over time. Suggestions on how the receiver can sense and compensate for token clock drift are welcome.

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