Patent ID: 11948031
Assignee: NANJING UNIVERSITY
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. The authentication method according to claim 2, characterized in that the method for measuring the persistence time comprises the following steps:
data are written by the reader into the volatile memory of multiple target tags, and need to be maintained by charging;
the reader is turned off, and waits for the time t before querying the volatile memory for the data: if there are tags with changed data, the current waiting time is taken as the persistence time of the volatile memory of the corresponding tags; if there are no tags with changed data, the waiting time t is updated with the step time Δt before returning to the operation of writing the data; and
if there are still tags with unchanged data, the waiting time t is updated with the step time Δt before returning to the operation of writing the data, until the persistence time of the volatile memory of all the target tags is acquired.