Aiming at the sensitive information leakage problem when the intelligent terminals collecting users' electricity information frequently in smart grid to achieve the forecast and scheduling functions

a novel certificateless ring signcryption scheme is proposed to preserve the users' privacy. The new scheme eliminates the computational cost of bilinear pairing and exponentiation by using the modular multiplication on elliptic curves. The security analysis proves that this scheme can satisfy the unconditional anonymity

confidentiality and unforgeability. The experimental result shows that the proposed scheme has the lower computational overhead and is more suitable for complex and efficient smart grid comparing with the existing schemes.