A Controllable Quantum Sequential Signature and Vote Scheme

In order to realize digital signature and vote validly and reliably in multi-user environment, a controllable quantum sequential signature and vote scheme is put forward. The signature of cryptograph and users validation are achieved by using the property of quantum entanglement swapping in Bell states;The choice of target users and the transmission of signature-information between users are implemented by controllable quantum teleportation; The quantum key and one-time pad ensures the safety of our scheme. The verification for each terminal and the center is required in this scheme, so it can position where the error happens accurately; The signature-user is ensured unknown to other users in this scheme, and the same to the comment by the signature-user. It has better performance in confidentiality and practicability compared with previous work.