US 12,463,804 B2
Quantum key distribution-based quantum digital signature method and system including trusted node
Il Kwon Sohn, Daejeon (KR); Kwang Il Bae, Daejeon (KR); Eun Joo Lee, Daejeon (KR); and Won Hyuk Lee, Sejong-si (KR)
Assigned to KOREA INSTITUTE OF SCIENCE & TECHNOLOGY INFORMATION, Daejeon (KR)
Filed by KOREA INSTITUTE OF SCIENCE & TECHNOLOGY INFORMATION, Daejeon (KR)
Filed on Jun. 20, 2023, as Appl. No. 18/338,179.
Claims priority of application No. 10-2023-0003408 (KR), filed on Jan. 10, 2023.
Prior Publication US 2024/0235825 A1, Jul. 11, 2024
Int. Cl. H04L 9/08 (2006.01); H04L 9/14 (2006.01); H04L 9/32 (2006.01)
CPC H04L 9/0852 (2013.01) [H04L 9/0819 (2013.01); H04L 9/14 (2013.01); H04L 9/3247 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A quantum key distribution (QKD)-based quantum digital signature method using a trusted node, the QKD-based quantum digital signature method being performed by the trusted node and comprising:
sharing a first secret key with a message-sending node;
sharing a second secret key with a message-receiving node;
generating a first trusted-node signature by performing a partial QKD process together with the message-sending node;
generating a second trusted-node signature by performing a partial QKD process together with the message-receiving node; and
verifying a first message with the shared first and second secret keys and with the first and second trusted-node signatures,
wherein
the first trusted-node signature is a trusted-node bitstring having a first length,
the second trusted-node signature is a trusted-node bitstring having a second length, and
a difference between the first length and the second length is determined based on a loss rate of a quantum channel between the trusted node and the message-sending node.