Integer Wavelet based Secret Data Hiding by Selecting Variable Bit Length

Abstract

Steganography is a process of hiding secret information"s like image, video, audio, and text message in a carrier"s like image, video, and audio. Proposed method uses the secret information as a text message which is embedded in a color image. The existing methods hide the information using constant bit length in integer wavelet coefficients. This paper uses variable bit length based on integer wavelet coefficients to hide the data in a particular positions using secret key by LSB substitution method. Hence this algorithm increases the embedding capacity of the text message and obtained stego image is imperceptible for human vision. This technique embeds binary bit stream of secret text message into the 8 bit color image. The embedded confidential information can be extracted from stego image without the knowledge of original image by considering the same secret key. On average of 2.50 bits can be embedded in each wavelet coefficient of the input color image. Hence this method gives better results in both embedding capacity and PSNR than the existing methods.

Adaptive Steganography Based on Logistic Map

“…paper [14] proposes a method for image steganography. The chosen Variable Embedding Ratio [VER] is 4:2 that is 4 bits are embedded in edge pixels and 2 bits in other pixels.In [15] uses variable bit length based on integer wavelet coefficients to hide the data in a particular positions using secret key by LSB substitution method. In smooth areas they embed three bits of secret information.…”

Real-time implementation of steganography in medical images using integer wavelet transform

“…Steganography is used to hide a secret message within a cover image, thereby yielding a stego image such that even the trace of the presence of secret message cannot be detected. This methodology has been used to great effect in the past [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The piece of data that has the message embedded in it is visible to the world in the clear and appears as harmless and normal.…”

“…A message in cipher text arouses some sort of suspicion whereas invisible message embedded in clear text does not. This is the advantage of steganography [2].In digital steganography, electronic communications may include steganographic coding inside of the transport layer, such as a document file, image file, program such as in the header of a TCP/IP packet. Media files are ideal for steganographic transmission because of their large size facilitates easy embedding of data.…”

“…The more recent research has been focused on the DWT and the DFT. The secret message is embedded into the high frequency coefficients of the wavelet transform as changes are less likely to be noticed while leaving the low frequency coefficients sub band unaltered [2][3][4][5]. Wavelet transform based stego technique provides high capacity data hiding as the secret message is embedded into the high frequency and low frequency coefficients of the wavelet transform which allows it to have high hiding capacity, but it provides less PSNR at high hiding rate.…”

An Ideal Steganographic Scheme in Networks Using Twisted Payload

“…Sumanth Sakkara et al, [5] has presented proposed method that uses the secret information as a text message which is embedded in a color image. The existing methods hide the information using constant bit length in integer wavelet coefficients.…”