Signcryption is a cryptogaphic protocol that combines both the functions of confidentiality and authentication in a logical step

and the computational costs and communication overheads should be lower than the traditional signature-then-encryption approach.So signacryption has good prospects in the direction of e commerce.Based on bilinear pairing on Elliptic Carve

a new mufti-signacryption scheme is proposed.11te scheme could decrease the cost of building and managing public key infrastructures; the expense of the users' management of public-key and their certificates is avoided.We had a safety of analysis

that the proposed scheme is proved to be secure aesuming the bilinear Diffle-Hellem problem is hard.