| 摘要 |
PROBLEM TO BE SOLVED: To provide a time stamp compression apparatus, a verification apparatus, a request apparatus, a server, a control method, a program, and a storage medium, which prvent a sender from selecting mail with a delivery certificate at time t after the time in accordance with sender's convenience. SOLUTION: The time stamp compression apparatus includes, an input means, an output means, a calculation means, history Hist to be a storage device, a time stamp request receiving device, a time stamp request connection device, and a time stamp certificate disclosing device. COPYRIGHT: (C)2010,JPO&INPIT
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