Secure Authentication Scheme for Images using Double Random Phase Encoding and JSTEG Steganography
10 Pages Posted: 4 Oct 2019
Date Written: October 3, 2019
This paper aims at developing a new multimedia authentication scheme using the optical encoding technique – Double Random Phase Encoding (DRPE) and steganography techniques. The watermark image is encrypted using the DRPE technique, from the result of which only the phase values are preserved, neglecting the amplitude part. The phase values are further quantified using four levels and are embedded in the host media such as an image using the JSTEG steganographic algorithm. The receiver de-embeds the quantized values from the watermarked data and maps them to a set of four phase values, which is then decrypted using the inverse DRPE technique. Further, a nonlinear cross correlation between the decrypted watermark image and the original watermark image is used for authenticating the host image or video. The proposed scheme adds an additional layer of security in the fact that the watermarking image is unrecognizable even after decryption but can still be authenticated at the receiver. The proposed algorithm is tested for strength using various attacks including noise attacks, compression and occlusion of the watermarked media and the key sensitivity of the algorithm proposed is tested.
Keywords: Steganography, JSTEG, Multimedia, Double Random Phase Encoding
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