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Secure multi-party communication with quantum key distribution managed by trusted authority

United States Patent

July 9, 2013
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Techniques and tools for implementing protocols for secure multi-party communication after quantum key distribution ("QKD") are described herein. In example implementations, a trusted authority facilitates secure communication between multiple user devices. The trusted authority distributes different quantum keys by QKD under trust relationships with different users. The trusted authority determines combination keys using the quantum keys and makes the combination keys available for distribution (e.g., for non-secret distribution over a public channel). The combination keys facilitate secure communication between two user devices even in the absence of QKD between the two user devices. With the protocols, benefits of QKD are extended to multi-party communication scenarios. In addition, the protocols can retain benefit of QKD even when a trusted authority is offline or a large group seeks to establish secure communication within the group.
Nordholt; Jane Elizabeth (Los Alamos, NM), Hughes; Richard John (Los Alamos, NM), Peterson; Charles Glen (Los Alamos, NM)
Los Alamos National Security, LLC (Los Alamos, NM)
12/ 895,367
September 30, 2010
ACKNOWLEDGEMENT OF GOVERNMENT SUPPORT The United States government has rights in this invention pursuant to Contract No. DE-AC52-06NA25396 between the United States Department of Energy and Los Alamos National Security, LLC for the operation of Los Alamos National Laboratory.