Threshold Proxy Re-signature Scheme

The paper proposes a new threshold proxy re-signature scheme.In the standard proxy re-signature scheme,a semi-trusted proxy can transform Alice’s signature into Bob’s signature on the same message,but in this scheme there are n semi-trusted proxies between the two signers and the re-signature generation can be performed if and only if there are at least t proxies.This scheme holds the features of proxy re-signature and threshold signature,so it is especially suitable for some complicated checking and voting system.