Patent ID: 11963068
Assignee: GUARDTIME SA
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 10:
11. The method of claim 1, further comprising obtaining the first digital signature by submitting the travel token as at least one parameter of an input record to a hash tree infrastructure, in which the first digital signature comprises a vector of sibling values enabling recomputation upward through the hash tree infrastructure to a first calendar value that is synchronized with time and represents an uppermost value of the hash tree infrastructure at a corresponding first calendar time, said first digital signature thereby encoding the both the mobile device and location device identity elements, as well as the first calendar time;
whereby a purportedly authentic representation of the travel token may be subsequently verified as being valid if, upon recomputing a hash tree path represented by the sibling values, from the purportedly authentic representation of the travel token through the hash tree, the same uppermost value is obtained as is contained in the first digital signature.