Taking into account the secure communication and privacy protection in heterogeneous cryptography  systems, we propose a heterogeneous aggregate signcryption scheme from certificateless cryptosystems to identity-based cryptography systems, which allows multiple senders to communicate securely with multiple recipients. The scheme makes the senders anonymous in the system, and only trust agencies can track the senders’ real information. For the receivers, the disclosure of the legitimate recipients’ user information to unauthorized users is prevented by applying the Lagrange interpolation formula. In the random oracle model, it is proved that the scheme possesses indistinguishability against adaptive chosen ciphertext attacks and existential unforgeability against adaptive chosen-message attacks. Experimental results show that the scheme effectively improves the computational efficiency of the system.