Do 'Digital Certificates' Hold the Key to Colleges' On-Line Activities?

Several institutions experiment with technology designed to identify who is using a computer

Facing a growing need to verify the identities of students and employees for on-line transactions, a handful of universities have begun issuing high-tech "digital certificates" that are nearly impossible for hackers to tamper with.

Because the portable electronic identifiers are highly efficient at proving to other computers that people are who their computers say they are, officials at

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