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Proxy Blind Distributed Signature Scheme and Treatment with Finite Queue, Multi Server, Poisson Queue Model

R. Anitha, R.S. Sankarasubramanian


In a blind signature scheme, a user A can obtain the signature of any given messag, from the other entity B without revealing any information about the message or its signature to B. In a proxy signature scheme, a potential signer delegates his signing capability to a proxy entity, who signs a message on behalf of the original signer. In a distributed proxy signature scheme the power of the proxy signer is distributed among a group of signers, in such a way that any subset of it with a minimum number (threshold) of signers can sign a message on behalf of the original signer. In this paper, we introduce a distributed proxy blind signature scheme based on Discrete Log Problem. This scheme combines the properties of distributed, proxy and blind signature schemes. The concept is introduced by taking into the mind that whenever a person delegating his signing authority to the intended person there is no guarantee that the proxy signer is in the position to do the work (signing). The system may be engaged with some other work or the system may be corrupted (due to some malicious programs) at that time. In this case if the system is modeled with proxy signature scheme then the original signer cannot achieve his goal. In this paper we distribute the delegation into a group of persons with a threshold version. This technique will overcome the problem of unavailability of the intended person or system in a proxy signature scheme. Also this distributed concept will increase the robusteness of the scheme. As an application of our scheme, we fit our model to a polling station based automated electronic voting scheme. The legal issues of e-voting, the need for the distributedness in e-voting and the significance of Queue to our model have been discussed.


Distributed, secret sharing, Blind signatures, Proxy signatures

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