231,265 research outputs found
Conference Key Agreement and Quantum Sharing of Classical Secrets with Noisy 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 consider the applications of our distillation schemes for two
cryptographic tasks--namely, (a) conference key agreement and (b) quantum
sharing of classical secrets. In particular, we construct
``prepare-and-measure'' protocols. Also we study the yield of those protocols
and the threshold value of the fidelity above which the protocols can function
securely. Surprisingly, our protocols will function securely even when the
initial state does not violate the standard Bell-inequalities for GHZ states.
Experimental realization involving only bi-partite entanglement is also
suggested.Comment: 5 pages, to appear in Proc. 2005 IEEE International Symposium on
Information Theory (ISIT 2005, Adelaide, Australia
Biometric identity-based cryptography for e-Government environment
Government information is a vital asset that must be kept in a trusted environment and efficiently managed by authorised parties. Even though e-Government provides a number of advantages, it also introduces a range of new security risks. Sharing confidential and top-secret information in a secure manner among government sectors tend to be the main element that government agencies look for. Thus, developing an effective methodology is essential and it is a key factor for e-Government success. The proposed e-Government scheme in this paper is a combination of identity-based encryption and biometric technology. This new scheme can effectively improve the security in authentication systems, which provides a reliable identity with a high degree of assurance. In addition, this paper demonstrates the feasibility of using Finite-state machines as a formal method to analyse the proposed protocols
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