Time stamping method employing user specified time
First Claim
1. A computer-implemented method for time stamping a document comprising:
- receiving a time stamp receipt at an outside agency, said time stamp receipt including identifying data associated with said document and a time indication;
validating said time stamp receipt at said outside agency by comparing the time indication in said time stamp receipt to the current time; and
if said time stamp receipt is valid, binding at said outside agency said identifying data and said time indication using a cryptographic binding scheme.
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Accused Products
Abstract
A method for time stamping a digital document is disclosed. The document originator creates a time stamp receipt using the document and the current time. The time stamp receipt is submitted to a time stamping authority having a trusted clock. The time stamping authority validates the time stamp receipt by comparing the time value specified in the time stamp receipt to the current time. If the time value specified in the time stamp receipt is within a predetermined time window, the time stamping authority cryptographically binds the time value and document, or the time value and some representation of the document, e.g., by signing the time stamp receipt with its private signature key.
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Citations
24 Claims
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1. A computer-implemented method for time stamping a document comprising:
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receiving a time stamp receipt at an outside agency, said time stamp receipt including identifying data associated with said document and a time indication; validating said time stamp receipt at said outside agency by comparing the time indication in said time stamp receipt to the current time; and if said time stamp receipt is valid, binding at said outside agency said identifying data and said time indication using a cryptographic binding scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A computer-implemented method for time stamping a document comprising:
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creating a time stamp receipt including identifying data associated with said document and a time indication; transmitting said time stamp receipt to an outside agency; validating said time stamp receipt at said outside agency by comparing the time indication in said time stamp receipt to the current time; and if said time stamp receipt is valid, binding at said outside agency said identifying data and said time indication using a cryptographic binding scheme to generate a certified time stamp receipt. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification