This paper discusses the design of a Secure Time Stamp device used to securely timestamp digital data, such as computer documents, files, and raw binary data of arbitrary format. Thus, the device is used to prove two facts, Existence: That a file existed on a given date & time, and Data Integrity: That the file was not altered since the time it was stamped, These two facts are essential for a number of purposes, including but not limited to gathering and registering binary data to be used as forensic evidence, such as computer files, memory dumps, packet recorder data, security analysis logs, etc., Electronically “notarizing” the date and time of inventions and other time-critical documents, such as business plans, intellectual property, engineering documents, source code, contracts, etc., and Generating secure audit logs for financial transactions, crypto key generation and management, system management, etc.
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