Text and Audio Steganography Using Soft Computing

Abstract

Security of information has been always a critical issue but now days due to easily available newlinebroadband services and reach of mobile phones to almost each and every hand, information newlinesharing over the internet has been increased and the challenge related to security of these digital newlinedata over the network has also been increased. Many techniques are used to secure the valuable newlinedata over the common network and steganography is one of them. It is a technique used to newlineconceal a secret information within a normal appearing cover media in such a way that the newlineexistence of the message could not be noticeable to an unwanted person i.e. it makes the secret newlinemessage invisible for any unwanted recipient. If any suspicion arises about the presence of newlinemessage in the cover media then, the purpose of steganography fails. As we are dealing with newlinedigital steganography so, we are taking audio file as a cover media and text message as secret newlineinformation to be concealed in a cover audio file. When the secret information is embedded in newlinethe cover file it creates noise in it, but as we know the HAS cannot detect the sound less than newline20Hz or greater than 20000Hz, we have exploited this fact in our steganography procedure. To newlinemake our steganography algorithm more secure, here we are encoding the secret data within a newlinecover media using ASCII code after that GA has been applied in order to get an optimized newlineposition to hide the data in the audio samples and then the LSB algorithm is used to embed the newlinesecret information within the samples of the audio file. newlineWhile embedding secret text message in the audio file we have kep in our mind that the ratio of newlinesecret message and cover file should not exceed 1:10 ratio because if the size of the text message newlinewill be more then it may increase the noise in the cover file and the chances of suspicion toward newlinethe stego-cover file will be more. newline