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US 6,895,507 B1Granted
Method and system for determining and maintaining trust in digital data files with certifiable time
AssigneeTime Certain, LLC
InventorSteven W. Teppler
Life of this patent
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AssigneeTime Certain, LLC
InventorSteven W. Teppler
Estimating the term…
A system and methods for proving dates of digital data files, which are accessed, created, modified, received, or transmitted by a computer includes a trusted time source in a tamperproof environment, a first subsystem for saving the file at a moment in time, a second subsystem for retrieving from the trusted time source a date and a time corresponding to the moment in time, a third subsystem for appending the date and the time retrieved from the trusted time source to the saved file, a fourth subsystem for signing the saved file with the date and the time retrieved from the trusted time source appended thereto, a fifth subsystem for hashing the signed file to produce a digest, a sixth subsystem for signing the digest with a key to produce a certificate, a seventh subsystem for appending the certificate to the saved file, and an eighth subsystem for saving the file with the certificate appended thereto. The trusted time source is a real time clock, which is not resettable, is independent of any system clock of the computer, and is installed locally relative to the computer.
A system for maintaining trust in content of a digital data file, comprising:
A method for maintaining trust in content of a digital data file with a computing means having installed therein a system clock, an operating systems means for operating the computing means, and an application means running on said operating system means, comprising:
Dependencies are inferred from the claim text.