Threshold proxy signatures

A (t, n) threshold proxy signature scheme allows t or more proxy signers fr om a designated group of n proxy signers to sign messages on behalf of an o riginal signer. The authors review both Zhang's threshold proxy signature s cheme and Kim's threshold proxy signature scheme. They show that Zhang's sc heme suffers from some weaknesses and Kim's scheme suffers from a disadvant age. Based on Zhang's scheme, they propose a new threshold proxy signature scheme to defeat the weaknesses of Zhang's scheme and the disadvantage of K im's scheme.