In order to securely and efficiently transmit the privacy information to authorized users’ set through the unsafe channel and avoid key escrow, a new type certificateless broadcast signcryption scheme was put forward by using the cryptographic techniques on conic curve.First, correction of the scheme was analyzed and then the scheme was proven to have the properties of stronger unforgeability and confidentiality by using the hard problems of large number factorization and discrete logarithm on conic curve. Finally, the efficiency of the scheme was analyzed. It was shown that it has the high efficiency in computation cost for signcryption and designcryption, which improves the efficiency of network operation.
