发明名称 |
Method and apparatus for verifying secure document timestamping |
摘要 |
According to one embodiment of the invention, a method is provided for receiving a timestamp from a caller via a telephone connection; receiving a device identifier from the caller, in which the device identifier identifies a device; determining a cryptographic key based on the device identifier; determining an indication of a time based on the timestamp and the cryptographic key; providing the indication of the time to the caller; determining an account; and charging a fee to the account.
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申请公布号 |
USRE41960(E1) |
申请公布日期 |
2010.11.23 |
申请号 |
US20050293790 |
申请日期 |
2005.12.02 |
申请人 |
WALKER DIGITAL, LLC |
发明人 |
WALKER JAY S.;SCHNEIER BRUCE;JORASCH JAMES A.;ALDERUCCI DEAN P. |
分类号 |
H04L9/00;G07D7/00;H04L9/32;H04N1/44 |
主分类号 |
H04L9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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