Data Security Using LSB & DCT Steganography In Images
Deepak Singla, Rupali Syal · 2012
Steganography is a technique of hiding information in digital media. In contrast to cryptography, it is not to keep others from knowing the hidden information but it is to keep others from thinking that the information even exists.In this paper, we propose a LSB & DCT-based steganographic method for hiding the data. Each bit of data is embedded by altering the least significant bit of low frequency DCT coefficients of cover image blocks. There are some techniques to utilizes the idea of SSB-4 technique in modifying the other bits (i.e, 1 st , 2nd, 3rd and/or 4th), to obtain the minimum variation between the original and the modified coefficient. The experimental results show that this algorithm has better PSNR value and high capacity in comparison to other techniques such as LSB, modulus arithmetic, SSB4-DCT. It also maintains satisfactory security as secret message cannot be extracted without knowing the decoding algorithm. This is achieved using a Public Private key. It combined both feature of Steganography and cryptography.