A New Cryptic Steganographic Approach using Video Steganography

Abstract

Nowadays, Data transmission over internet is not at all secure and they are vulnerable to various attacks. So in order to prevent our valuable information we require special security measures. One of the methods for secure data transmission is cryptography where the information is protected by transforming it into unintelligible format. But we can ensure more security if the existences of the hidden message itself is concealed. Steganography is one such method in which the message may be hidden in image, audio, video, text etc. In this paper a sequential hybrid method to integrate cryptography and steganography in order to provide more than one level security is being proposed. And it is proposed to use video steganography in order to store high capacity data. The secret information is encrypted using the standard encryption algorithm AES. Then the encrypted message is embedded in the motion vector of the compressed video. The motion vector for embedding data is selected based on their associated macro block prediction error. Then the secret message is embedded in both horizontal and vertical component of the motion vector. At the same time in each GOP, the control information for data extraction will be embedded in I frame. At the receiving end the control information in I frame should be extracted first then the encrypted message can be extracted from P and B frames accordingly. The original message is retrieved back by applying decryption algorithm