We study a model of proxy voting where the candidates, voters, and proxies are all located on real line, instead directly, each voter delegates its vote to closest proxy. The goal is find set that theta-representative, which entails for any anywhere favorite candidate within distance theta This property guarantees strong form representation as voters not required be fixed in advance, or even fi...

A proxy signature scheme enables a proxy signer to sign messages on behalf of the original signer. In this paper, we demonstrate that a number of discrete logarithm based proxy signature schemes are vulnerable to an original signer’s forgery attack. In this attack, a malicious original signer can impersonate a proxy signer and produce a forged proxy signature on a message. A third party will in...

The t-out-of-n threshold proxy signatures allow an original signer to delegate his signing capability to a group of proxy signers, and t or more proxy signers can generate valid signatures by cooperating. Recently, Liu and Huang proposed a variant of threshold proxy signature scheme in which all proxy signers remain anonymous. The authors claimed their construction satisfies unforgeability, pro...