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

Claim 5:
6. 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;
the reader queries the volatile memory for the data: if there are target tags with changed data, the corresponding total discharge time is taken as the persistence time of the volatile memory of the corresponding target tags; if there are no target tags with changed data, the reader keeps querying the target tags; and
if there are still tags with unchanged data, the reader will repetitively query, until the persistence time of the volatile memory of all the target tags is acquired;
wherein the volatile memory therein is the S1 inventoried flag.