A VISUAL INFORMATION ENCRYPTION SCHEME BASED ON VISUAL
CRYPTOGRAPHY AND D-H KEY AGREEMENT SCHEME
ABSTRACT
Visual cryptography is one kind of image encrypting. It is different from traditional
cryptography, because it does not need complex computation to decrypt. In current technology,
most of visual cryptography are embedded a secret using two shares is limited. Visual
Cryptography is based on cryptography where n images are encoded in a way that only the
human visual system can decrypt the hidden message without any cryptographic computations
when all shares are stacked together. It reduces the noise in the cover images without adding any
computational complexity.
This project presents a new visual cryptography scheme for secure digital
transmission. Visual cryptography can be seen as a one-time pad system. Then, it cannot be
reused. In this project, we apply Diffie and Hellman (D-H) key agreement method and toral auto
orphism (TA) such that visual cryptography can be reused. Both secret and symmetry-key are
represented in binary image. The proposed scheme is simple and easy to be implemented for
shadow images. Therefore, it can be used in many electronic business applications.
INTRODUCTION
In the present era of computers and fast communication, one needs to protect communicated
information (message or plain text) from unauthorized user, while sending it through any
electronic media. So, security of visual data is an important issue in the design of communication
systems. Data hiding techniques and visual cryptography are used to introduce confidentiality
and security when visual data are transmitted through unsecured communication channels. Data
hiding techniques try to embed data in digital media and transmit it in an imperceptible way.
Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad
www.kresttechnology.com, E-Mail : krestinfo@gmail.com , Ph: 9885112363 / 040 44433434
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The private-key and the public-key are the two well-known cryptosystems, using these we enable
to keep the secret data securely in such a way that that invader cannot able to understand what
the secret data means. The data encryption standard (DES) and Rivest, Shamir, Adleman (RSA)
and Advanced Encryption Standard (AES) are three representative methods. Apart from
cryptography, steganography provides another way to keep the data secure. The Steganography
consists of techniques to allow the communication between two persons. It hides not only the
contents but also the existence of the communication in the eyes of any observer. These
techniques use a second perceptible message, with meaning disjoined by the secret message.
This second message works as a “Trojan horse”, and is a container of the first one. The new
technologies and, in special way, the information networks require more and more sophisticated
strategies in order to prevent the message privacy. In this context, digital images and audio is
excellent candidate to turn into containers of the messages, since the bits of a secret text message
can be superimposed, as slight noise, to the bits employed for coding a digital image.
REFERENCES:
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[2] R. L. Rivest and A. Shamir, “How to expose an eavesdropper”, Communications of
the Association for Computing Machinery, vol. 27, no. 4, pp. 393-395, 1984.
[3] R. Lukac and K. N. Plataniotis, “Bit-level based secret sharing”, Patter Recognition,
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[4] S. Blake-Wilson and A. Menezes, “Authenticated Diffie- Hellman Key Agreement
Schemes”, SAC '98: Proceedings of the Selected Areas in Cryptography, pp. 339-361,
1999.
[5] U. Maurer, “Towards the equivalence of breaking the Diffie-Hellman scheme and
computing discrete logarithms”, Advances in Cryptology - Crypto '94, Springer-Verlag,
pp.271-281, 1994.
Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad
www.kresttechnology.com, E-Mail : krestinfo@gmail.com , Ph: 9885112363 / 040 44433434
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