Research Of Certificateless Multi-Receiver Signcryption With Pre-judging Receiver

The advent of the big data era has led to a sharp increase in the amount of data during the communication process,and the efficiency and the security of the communication have been widely concerned by researchers.Certificateless multi-receiver signcryption,considered as one of the most promising and efficient methods to achieve the secure one-to-many communication in the big data era,enables the sender to generate the same signcryption ciphertext for multiple receivers only by one signcryption operation,and every receiver has the ability to independently decrypt and verify the signcryption ciphertext.However,none of the existing certificateless multi-receiver signcryption schemes enables the receiver to judge whether he/she is an authorized receiver or not before the ciphertext is decrypted,which increases the receiver's unnecessary computational burden in an unauthorized situation.At the same time,the majority of schemes only focus on the implementation of functions in design,and do not pay too much attention to the efficiency issue,and thus they are not high in computational efficiency.Besides,most of schemes do not simultaneously achieve the security attributes such as the receiver anonymity and the sender anonymity,and they are ill-conceived about the participants' privacy protection problem.With above problems considered,a lightweight certificateless multi-receiver signcryption scheme with pre-judging receiver is proposed in this paper.In the proposed scheme,the receiver can judge whether he/she is an authorized receiver or not before decrypting the ciphertext,thereby avoiding the unnecessary decryption operations in an unauthorized situation and reducing his/her computational burden.At the same time,we also regard the efficiency improvement as a design focus,and the designed scheme does not use the computationally complex bilinear pairing operations and reduces elliptic curve point multiplication operations,achieving the lightweight calculation.Moreover,introducing the polynomial to combine and hide multiple authorized receivers' identities,the proposed scheme protects the authorized receivers' privacy.After that,through the research on the designed scheme above,it is found that the above scheme has no ability to protect the sender's privacy.That is,the authorized receiver can obtain the sender's identity during the decryption process,leading to the disclosure of the sender's privacy.There also exists this problem in the existing certificateless multi-receiver signcryption schemes.For the purpose of protecting all participants' privacy during the communication process,a completely anonymous certificateless multi-receiver signcryption scheme with pre-judging receiver is proposed in this paper.In addition to achieving the receiver anonymity,the proposed scheme also implements the sender anonymity,and even the authorized receiver cannot obtain the sender's identity during the decryption process,which protects the privacy of all participants including the receiver and the sender.Moreover,on the premise that the sender's willingness is respected,it enables the sender's identity to be verified and realizes the revocability of the sender anonymity.Two proposed certificateless multi-receiver signcryption schemes with pre-judging receiver in this paper can solve the problem that the receiver cannot pre-judge whether he/she is an authorized receiver or not in the existing certificateless multi-receiver signcryption schemes.The former scheme achieves the lightweight in calculation and protects the multiple authorized receivers' privacy.The latter scheme simultaneously achieves the receiver anonymity and the sender anonymity,and solves the problem on the participants' privacy protection.They all have the provable security and the partial private key verification function,and meet the decryption fairness.They are suitable for application scenarios involving low-performance devices,such as sensor networks and mobile communications.