A Secure and Robust Certificateless Public Key Steganography Based on SVD-DDWT

Security and undetectability are main goals of steganographic systems. This paper proposes a novel certificateless public key steganography that allows two parties that have no prior knowledge of each other to communicate covertly over public channel. Firstly, secure and high efficient rate of key distribution are provided. Secondly, proper stego and destego are introduced based on Distributed Discrete Wavelet Transform (DDWT) and Singular Value Decomposition (SVD).Thirdly, we present the Matlab analysis of the original and stego images, which proves the robustness of our scheme. Finally, the analyses demonstrate that our scheme meets all security requirements of steganographic system and resists various kinds of sophisticated attacks.