Security of data is one of the most challenging problems in today's technological world. In order to secure the transmission of secret data over the public network (Internet), numerous data security and hiding algorithms have been developed in the last decade. Steganography combined with cryptography can be one of the best choices for solving this problem. In this paper, the proposed framework is the dual layer of security, in which the first layer is to encrypt the secret text message using advanced encryption standard (AES) algorithm and in the second layer to embed this message using the indicator-based least significant bit (LSB) method which is used to hide the encrypted text message into the cover image. It differs from the LSB algorithm in that it does not embed the bytes of the cover data sequentially but it embeds into one bit or two bits at once. Actually, it depends on indicators to determine where and how many bits to embed at a time. The Mean Square Error (MSE) and Peak Signal to Noise Ratio (PSNR) measure the imperceptibility of the system. Experimental results show that the stego image is usually indistinguishable from the cover image.
advanced encryption standard (AES) algorithm, indicator-based least significant bit (LSB) method, encryption, embedding, MSE, PSNR
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