| 摘要 |
An owner timestamps data f by generating a set of domain names D from the data f and the 'timestamping' time t. The owner then sends resolution requests for the domain names D to one or more DNS servers. To verify a timestamp, a verifier generates a set of domain names D from the data f and the 'timestamping' time t, sends resolution requests for the domain names D to the same DNS servers as the owner, receives resolution responses comprising TTL values, retrieves reference TTLs for the DNS servers and compares the current time with the 'timestamping' time t and, for each resolution response, the TTL and the reference TTL. If a predetermined ratio of comparisons match, then the timestamp is verified. Also provided are devices and computer program products.
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