A Novel Approach of Text Steganography based on null spaces

Abstract

Steganography is the art and science of covered or hidden writing. The purpose of steganography is covert communication to hide the existence of a message from an intermediary. Digital Steganography algorithms have been developed by using texts, images and audio etc as the cover media. In this approach, a security model is proposed which imposes the concept of secrecy over privacy for text messages. In the recent years, we have plenty of security tools which are developed to protect the transmission of multimedia objects. But approaches for the security of text messages are comparatively less. In this approach we present a new approach on text steganography through the null space in the cover message for hiding the secret message. In this method, hiding bits of secret message is done through adding extra null spaces in the plaintext of the cover file. These null spaces placed, when the binary bit of secret message is equal to 1 in plaintext of the cover file. And null space remains unchanged when the binary bit of the secret message is equal to 0.