| 摘要 |
There is disclosed a method of verifiably time stamping a data set stored to a data storage medium, for example a tape, comprising generating a first checksum value uniquely identifying said data set, sending said checksum value to an independent trusted organization which adds an independently generated trusted time stamp data to said checksum value and encrypts said checksum value and said time stamp data using a key data generated by a certification authority. The receipt data is returned to a data storage device, which adds the receipt data to the data set for storage on the data storage medium. Verification of the data set read from the data storage medium comprises generating a first checksum value from the data set, and sending the first checksum value and the encrypted receipt data to a trusted verifying organization. The trusted organization decrypts the encrypted receipt data using its key data, and compares the received checksum value, with a checksum value determined from the receipt data, compares the two checksum values and depending upon the result of the comparison, verifies whether the time stamp data corresponds to the received checksum value or not. A verification result message is generated confirming either the time stamp data does or does not correspond to the received checksum value.
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