Quantum conference key agreement using photonic graph states

2021 ◽  
Author(s):  
Joseph Ho ◽  
Massimiliano Proietti ◽  
Federico Grasselli ◽  
Alexander Pickston ◽  
Peter Barrow ◽  
...  
Keyword(s):  
Key Agreement ◽  
Graph States

scholarly journals Multi-partite quantum cryptographic protocols with noisy GHZ states

2007 ◽  
Vol 7 (8) ◽  
pp. 689-715
Author(s):  
K. Chen ◽  
H.-K. Lo
Keyword(s):  
Bipartite Graph ◽  
Wide Class ◽  
Key Agreement ◽  
Bell Inequalities ◽  
Cryptographic Protocols ◽  
Entangled States ◽  
Threshold Values ◽  
Initial State ◽  
Graph States ◽  
Ghz States

We propose a wide class of distillation schemes for multi-partite entangled states that are CSS-states. Our proposal provides not only superior efficiency, but also new insights on the connection between CSS-states and bipartite graph states. We then apply our distillation schemes to the tri-partite case for three cryptographic tasks---namely, (a) conference key agreement, (b) quantum sharing of classical secrets and (c) third-man cryptography. Moreover, we construct ``prepare-and-measure'' protocols for the above three cryptographic tasks which can be implemented with the generation of only a single entangled pair at a time. This gives significant simplification over previous experimental implementations which require two entangled pairs generated simultaneously. We also study the yields of those protocols and the threshold values of the fidelity above which the protocols can function securely. Rather surprisingly, our protocols will function securely even when the initial state does not violate the standard Bell-inequalities for GHZ states.

Two Party Certificateless Key Agreement Schemes

2011 ◽  
Vol 22 (11) ◽  
pp. 2843-2852
Author(s):  
Wen-Hao LIU ◽  
Chun-Xiang XU
Keyword(s):  
Key Agreement

Enhanced Attribute-Based Authenticated Key Agreement Protocol in the Standard Model

2014 ◽  
Vol 36 (10) ◽  
pp. 2156-2167
Author(s):  
Qiang LI ◽  
Deng-Guo FENG ◽  
Li-Wu ZHANG ◽  
Zhi-Gang GAO
Keyword(s):  
Standard Model ◽  
Key Agreement ◽  
Authenticated Key Agreement ◽  
Key Agreement Protocol ◽  
The Standard Model

scholarly journals Secure multiparty quantum key agreement against collusive attacks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hussein Abulkasim ◽  
Atefeh Mashatan ◽  
Shohini Ghose
Keyword(s):  
Key Agreement ◽  
Sensitive Information ◽  
Quantum Key Agreement ◽  
Key Agreement Protocol ◽  
Proposed Model ◽  
Shared Key ◽  
Agreement Protocols ◽  
Collusive Attacks ◽  
Attack Strategy ◽  
Collusive Attack

AbstractQuantum key agreement enables remote participants to fairly establish a secure shared key based on their private inputs. In the circular-type multiparty quantum key agreement mode, two or more malicious participants can collude together to steal private inputs of honest participants or to generate the final key alone. In this work, we focus on a powerful collusive attack strategy in which two or more malicious participants in particular positions, can learn sensitive information or generate the final key alone without revealing their malicious behaviour. Many of the current circular-type multiparty quantum key agreement protocols are not secure against this collusive attack strategy. As an example, we analyze the security of a recently proposed multiparty key agreement protocol to show the vulnerability of existing circular-type multiparty quantum key agreement protocols against this collusive attack. Moreover, we design a general secure multiparty key agreement model that would remove this vulnerability from such circular-type key agreement protocols and describe the necessary steps to implement this model. The proposed model is general and does not depend on the specific physical implementation of the quantum key agreement.

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