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Motivated by the demand to have secure signcryption scheme, even in quantum era, the concept of signcryption tag-KEM (key encapsulation machine) is extended to lattice cryptography in this paper. A lattice-based hybrid signcryption scheme is proposed by building a lattice-based signcryption tag-KEM. Based on the hardness of the learning with errors problem and the short integer solution problem, the proposed hybrid signcryption is provable secure in the random oracle model. Furthermore, according to the quantum intractability assumption about lattice problem, the proposed hybrid signcryption scheme is secure even on quantum computers.

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