US 12,341,880 B2
Quantum key token
Koon Tong Goh, Singapore (SG); Chee Ping George Loh, Singapore (SG); and Ci Wen Lim, Singapore (SG)
Assigned to NATIONAL UNIVERSITY OF SINGAPORE, Singapore (SG)
Appl. No. 18/255,911
Filed by NATIONAL UNIVERSITY OF SINGAPORE, Singapore (SG)
PCT Filed Nov. 30, 2021, PCT No. PCT/SG2021/050737
§ 371(c)(1), (2) Date Jun. 5, 2023,
PCT Pub. No. WO2022/124984, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 10202012172Q (SG), filed on Dec. 7, 2020.
Prior Publication US 2024/0097890 A1, Mar. 21, 2024
Int. Cl. H04L 9/08 (2006.01); G06F 7/58 (2006.01)
CPC H04L 9/0852 (2013.01) [G06F 7/588 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of using a quantum random number generator (QRNG) for security applications, the method comprising the steps of:
generating one or more quantum keys using the QRNG, including one or more quantum encryption keys;
storing, using a secure network, corresponding sets of the quantum keys in a server located at a controlled access location and in a quantum key token (QKT) for a user, respectively; and
using the corresponding sets of quantum keys for secure transmission between the server and a user device comprising the QKT when outside the secure network or for access control to the controlled access location,
wherein generating the quantum encryption keys comprises limiting a length of the quantum encryption keys to be not greater than the quantum entropy of the keys generated by the QRNG via a randomness extractor.