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OwnerErik H. van der Kaay, David Tyo +2inventors
InventorsErik H. van der Kaay, David Tyo, David Robinson, Gregory L. Dowd
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A trusted time infrastructure system provides time stamps for electronic documents from a local source. The system comprises a trusted master clock, a trusted local clock, and a network operations center. The trusted master clock and network operations center are located within secure environments controlled by a trusted third party. The trusted local clock may be located in an insecure environment. The trusted master clock is certified to be synchronized with an accepted time standard, such as a national time server. The trusted local clock, which issues time stamps, is certified to be synchronized with the trusted master clock. Time stamps and certifications are signed by the issuing device using public key cryptography to enable subsequent authentication. The network operations center logs clock certifications and responds to requests for authentication of time stamps.
A time stamp certifying the existence of a digital document at a time, the time stamp comprising:
A method of creating an authenticatable time stamp certifying the existence of a digital document at a time, the method comprising:
A trusted clock configured to provide time, the trusted clock certified through a chain of at least one cryptographically signed certificates to be synchronized with an accepted standard, wherein each of the signed certificates certifies that two clocks have been determined to be synchronized.
A certificate certifying that two clocks are synchronized, the certificate comprising:
Dependencies are inferred from the claim text.