A New Image Block Encryption Method Based on Chaotic Map and DNA Encoding

Feature extraction in image encryption is a selective encryption method that has emerged in recent years. In this paper, significant detection is used to extract important information from the image, and we can pre-encrypt this information. The pre-encryption process uses an image block encryption algorithm based on Chen chaotic system and DNA coding. Secondly, the discrete wavelet transform (DWT) is used to encrypt the reference image. Finally, the pre-encrypted image is combined with transformed image which obtained from the reference image. After that, a visually meaningful encrypted image can obtain by inverse discrete wavelet transform. Because this final image is very similar to an ordinary image, it is not vulnerable to attack. This method effectively protects the plaintext image.