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This work presents quantum key distribution protocols (QKDPs) to safeguard security in large networks, ushering in new directions in classical cryptography and quantum cryptography. Two mediator protocols, one with implicit user authentication and the other with explicit mutual authentication, are proposed to demonstrate the merits of the new combination, which include the following:

1) security against such attacks as man-in-the-middle, eavesdropping and replay,

2) efficiency is improved as the proposed protocols contain the fewest number of communication rounds among existing QKDPs, and

3) two parties can share and use a long-term secret (repeatedly). To prove the security of the proposed schemes, this work also presents a new primitive called the Unbiased-Chosen Basis (UCB) assumption.



Processor : Intel Pentium IV

RAM : 512 MB

Hard Disk : 40GB


Operating System : Windows 98,2000,xp

Tools : jdk1.5.0

Technologies : J2SE (network,IO,Swings, Util,crypto)