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The emerging Cross-Technology Communication (CTC) has enabled the direct communication among different protocols, which will greatly enhance the spectrum efficiency. However, it will also bring security challenges to end IoT devices since the attacks can be from heterogeneous devices. Current deployed security mechanisms cannot be applied among heterogeneous devices. This work proposes a new mechanism to verify the legitimacy of signal source so that only the signals from legal CTC devices can be further processed. We verify the legitimacy of devices by embedding authorization codes into the packets at the sender side and verify them at the receiver side. Theoretical analysis and experiments show that this mechanism can provide effective protection on heterogeneous communication pairs.