A survey of hybrid signcryption

In hybrid signcryption,a signcryption key encapsulation mechanism(KEM)employs the public key technique to encapsulate a symmetric key,while a data encapsulation mechanism(DEM)makes use of the symmetric technique and symmetric key to encrypt arbitrary message.The security model of hybrid signcryption does have the advantage of allowing the security requirements of the asymmetric part and symmetric part to be completely independent,hence,we can study their security respectively.Compared with signcryption technique in public key setting,hybrid signcryption technique has higher flexibility and better security in cryptographic applications.We research and analyze the existing hybrid signcryption schemes,and then give the algorithm models,formally secure definitions and instance schemes for PKI-based hybrid signcryption,identity-based hybrid signcryption and certificateless hybrid signcryption.Moreover,we point out some possible future work.