Abstract: In this paper, we proposed a reconfigurable secure image codec based on the Discrete Wavelet Transformation (DWT) and the Advanced Encryption Standard (AES) processor. Either, use of image coding with DWT or encryption using AES is well known. However, linking these two designs to achieve secure image coding is leading. The prominent feature of this method is a partial encryption of bass frequency (LL bands) by AES-128 (128-bit keys), or AES-192 or AES-256. Our approach provides considerable levels of security (key size, partial encryption, encryption mode), and has very limited adverse impact on the compression efficiency. The proposed codec can provide up to 9 cipher schemes within a reasonable software cost. Correlation, PSNR and compression rate results from these codec are analyzed.
Brief Intro: In the digital world nowadays, the security of digital images/videos becomes more and more important since the communications of digital products over network occur more and more frequently. Since digital video transmission system usually includes a compression module that aims to reduce the transmitted bit rate, the cryptography techniques have to be carefully designed to avoid potential adverse impact on the compression efficiency, and on the functionalists that the compression format provides. The past decade, several efforts have developed image-video encryption schemes for secure information transfer. These techniques can be classified into three types according to the target data selected from compression stages. The first one is named “Spatial Domain” schemes, which apply encryption to the original information directly like. The second scheme is named “Bit stream Domain”, which encrypts the code words of compressed Bit stream like. To reduce the amount of processing overhead, the third schemes as know “Frequency Domain” has been proposed, which utilize the results of DCT or DWT transformation and quantization stages of compression process. To deal with the amount of codec performance and intensive computation given by security mechanisms, this paper proposes a secure image codec configurable. We have proposed our codec by synthesis of the JPEG200 codec and the JPEG Codec.
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Index Keywords: AES, Band LL, DWT, Partial Encryption, Security Levels.
