Author(s): Subhashini.D, Nalini.P, Chandrasekhar.G
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Vol.1 - Issue 4 (June- 2012)
Steganography plays an important role in the past few years due to the increasing need for providing secrecy in an open environment like the internet. Many techniques are used to secure information such as Cryptography that aims to scramble the information sent and makes it unreadable while steganography is used to conceal the information so that no one can sense its existence. In most algorithms, to secure information both steganography and cryptography are used together to secure a part of information. Steganography has many technical challenges such as high hiding capacity and imperceptibility. In this paper we compared two proposed techniques, one with wavelet transforms and other with block truncation coding. First method hides secret data in the integer wavelet coefficients of the cover image with the optimum pixel adjustment (OPA) algorithm. The coefficients used are selected according to a pseudorandom function generator to increase the security of the hidden data. The OPA algorithm is applied after embedding secret message to minimize the embedding error. Second method hides information by Block truncation coding (BTC) by using two quantization levels and a bit plane. Here hiding capacity is independent of the compressed codes. Comparison between two techniques is done by Mean Square Error (MSE), Peak Signal to Noise Rate (PSNR), length of secret message and received hidden secret message.
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