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Turbo-code has been applied in many fields except for the field of secret communication since its appearance. This paper presents a method on designing soft encrypting wireless channel based on turbo-code. The method utilizes existing wireless transmitting channel to realize secret communication based on turbo-code en-decoders. This paper also presents the encrypting method, which has the compositive elements of turbo-code en-decoders as secret key to realize encryption. The structures of encrypting system and decrypting system and the idea of encryption are also discussed in the paper. This paper simulates on the method with audio and image signal to check the effect of encryption and the validity of the method according to the designed program. This paper shows that the encrypting method can be extended into the design of channel codecs for wireless data transmission.

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