Color Image Restoration for an Effective Stegaography

Vol.4 No.3

Year: 2010

Issue: January - March

Title: Color Image Restoration for an Effective Stegaography                            

Author Name: Dwarkoba Gaikwad, S.J. Wagh   

Synopsis:   

The word steganography comes from the Greek Steganos, which mean covered or secret and graphy mean writing or drawing. There are many techniques in steganography such as least significant bit insertion (LSB), masking and filtering, and transformation techniques. The LSB technique is common, which randomly select the pixels of the cover-object that is used to hide the secret message. It is possible to combine the techniques by encrypting message using cryptography and then hides the encrypted message using steganography. The resulting stego-image can be transmitted without revealing that secret information is being exchanged. Furthermore, even if an attacker were to defeat the steganographic technique and detect the message from the stego-object, he would still require the cryptographic decoding key to decipher the encrypted message. In this paper we proposed the image restoration technique in Stenography. In this paper we blur image before hiding the message image using special Point Spread Function and randomly generated key. We have used two input key values as parameters of PSP. At the time of blurring the image, the different new third key value is generated for different message images. These keys are used at the time of the deblurring of  the message image which are kept secrete. For recovering the real message image we need to get image from stego image and then restore it. It is very difficult to restore message image without knowing PSF and third key value. We found, this technique is less time consuming, simple and robust.