| 摘要 |
<p>An owner (310) timestamps data f by generating (S11) a set of domain names D from the data f and the 'timestamping' time t . The owner then sends (S12) resolution requests for the domain names D to one or more DNS servers. To verify a timestamp, a verifier (340) generates (S21) a set of domain names D from the data f and the 'timestamping' time t , sends (S22) resolution requests for the domain names D to the same DNS servers as the owner (310), receives (S23) resolution responses comprising TTL values, retrieves (S24) reference TTLs for the DNS servers and compares (S25) 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.</p> |
