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This paper describes a voice encryption device that can be widely used in civil voice call encryption. This article uses a composite encryption method to divide the speech into frames, rearrange them in the time domain, and encrypt the content of the frames. The experimental results show that the device can complete the encryption normally under various analog voice call conditions, and the voice delay, quality, encryption effect, etc. are guaranteed. Compared with traditional time-domain encryption, it effectively solves the original voice information remaining in the encrypted information, and further increases the security of the voice.

FPGA-Based Voice Encryption Equipment under the Analog Voice Communication Channel