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This paper proposes a new joint error correction and encryption scheme based on turbo codes, which can be called as turbo-based encryption. The new scheme should have high error-correcting capability as well as security. In order to encrypt information by turbo code, two measures are adopted: 1) The interleaver of turbo code is improved, therefore it can be controlled by a secret key; 2) Another interleaver is added to the first output of turbo encoder, which is also controlled by a secret key. Simulations show that the new scheme has good performances in error-correcting capability and security. At last, this paper gives an application of the turbo-based method in image encryption.