This paper describes a system, based on cryptographic … system. Unlike conventional escrow schemes, this system is … or she holds the key to a particular … [via a 'check file'] and the owner of the key can verify [via a use counter and optional time stamps], when the escrow period is ended, that the escrow agent … [p. 34] past possession of the card conveys no … [since the escrowed keys are never revealed] …
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