Patent ID: 11965971
Assignee: HOPTROFF LONDON LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method for generating a trusted timestamp comprising:
(a) receiving, at an edge device, a first time signal from a trusted time source at a first time;
(b) transmitting, by the edge device, a message back to the trusted time source at a second time, wherein the message comprises the first time and the second time;
(c) determining a transmission latency between the trusted time source and the edge device based at least in part on the first time signal, the first time, the second time, and a third time at which the message is received by the trusted time source;
(d) calculating, by the trusted time source, a clock offset between the trusted time source and a local time source at the edge device, wherein the clock offset is calculated based on the transmission latency determined in (c), the second time and the third time;
(e) transmitting, from the trusted time source to the edge device, the clock offset calculated in (d) and the transmission latency determined in (c) along with a hash code; and
(f) generating, by the local time source at the edge device, a trusted timestamp for an event occurred at a fourth time, wherein the trusted timestamp is generated based at least in part on the clock offset received in (e) and the fourth time.