초록 ▼

The invention relates devices and methods for creating a cryptographically assured timestamp that can be verified by a party that was not present during the creation of the timestamp. The timestamp is applied to physical documents, and other substrates capable of receiving an optically detectable ma

The invention relates devices and methods for creating a cryptographically assured timestamp that can be verified by a party that was not present during the creation of the timestamp. The timestamp is applied to physical documents, and other substrates capable of receiving an optically detectable mark, that are to be transmitted to temporally or spatially distant recipients.

대표청구항 ▼

[ What is claimed is:] [61.] A device for secure document timestamping, comprising:a time generator for transmitting a representation of a time;a computing device, including a computer processor and a memory, the memory storing a device identification, the computer processor and the memory coupled t

[ What is claimed is:] [61.] A device for secure document timestamping, comprising:a time generator for transmitting a representation of a time;a computing device, including a computer processor and a memory, the memory storing a device identification, the computer processor and the memory coupled to receive the representation of the time from the time generator and programmed to perform a cryptographic operation on the representation of the time to produce a timestamp including the device identification;an output device, coupled to the computing device, for outputting the timestamp in optically detectable form in response to a timestamp request; andmeans for rendering at least one of the time generator and the computing device resistant to tampering.