A new (t, n) threshold signature encryption scheme with the specified receiver

In this paper, first, a signature encryption scheme with the specified receiver verification is proposed. The scheme perfectly integrates digital signature scheme with public key cryptosystem. Compared with common digital signature scheme, it has authentication, secrecy, data integrity and privacy of the receiver. Then, we use threshold scheme to construct a (t, n) threshold signature encryption scheme which has more secrecy of data transmission, robustness, requires smaller communication cost and performs efficiently etc.