A Secure Image Steganography Using Advanced Encryption Standard and Discrete Cosine Transform

Ashraful Tauhid, M. Tasnim, Saima Noor, Nuruzzaman Faruqui, M. Yousuf
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引用次数: 12

Abstract

Cryptography and Steganography are two prominent techniques to obtain secure communication over the shared media like the Internet. Steganography is slightly ahead of cryptography because of its stealthy characteristics. In this paper, a new method has been proposed which combines cryptography and steganography to ensure even more secure communication. The Advanced Encryption Standard (AES) in spatial domain of the carrier/cover image and Least Significant Bit (LSB) replacement in the transformed domain of the same image has been used after performing a Discrete Cosine Transform (DCT) on the pixels. An additional layer of security has been introduced by applying XOR operation on the AES encrypted message with the pixel values of the carrier image. The Peak Signal to Noise Ratio (PSNR) of the proposed algorithm is better than most of the similar algorithms. With better PSNR, the proposed method depicts a three layer of security of the information and error free decryption.
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基于高级加密标准和离散余弦变换的安全图像隐写
密码学和隐写术是在互联网等共享媒体上获得安全通信的两种突出技术。隐写术由于其隐秘的特性而略微领先于密码学。本文提出了一种将密码学和隐写术相结合的新方法,以确保更安全的通信。在对像素执行离散余弦变换(DCT)之后,使用了载体/覆盖图像的空间域中的高级加密标准(AES)和同一图像的变换域中的最低有效位(LSB)替换。通过对具有载体图像的像素值的AES加密消息应用XOR运算,引入了额外的安全层。该算法的峰值信噪比(PSNR)优于大多数同类算法。由于具有更好的PSNR,该方法描述了信息的三层安全性和无错误解密。
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