| 摘要 |
A method and system for tracking the time spent by an employee at a job site. The employee is provided with an identification card which includes an encrypted representation of a biometric characteristic of the employee. When the employee arrives at, or leaves, the job site the biometric characteristic recorded on the identification card is compared to the characteristic as directly sensed from the employee and, if the comparison is successful, the approximate time as derived from a secure clock, is recorded.
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