Chaotic Image Encryption with Hash Keying as Key Generator

ABSTRACT

This paper proposes an image encryption algorithm using Hash key as key generator for permutation and diffusion. SHA-1 algorithm is used to generate symmetric secret key for encryption/decryption process. One-dimensional Logistic map periodic window problem is addressed by employing multiple chaotic maps. In the permutation process, the permutation order is generated in bitwise using Logistic-Sine maps. For diffusion process, the diffusion bits are generated by Logistic-Tent and Tent-Sine maps. Multiple chaotic maps are used for permutation and diffusion to encrypt the images. The image encryption is repeated for four rounds and in each round, different keys are selected to resist chosen plain text attack. The image is encrypted for both gray and color images and satisfactory level of security is achieved. Simulation results are tested for key space analysis, key sensitivity analysis, histogram analysis, quantity analysis, correlation coefficient and average correlation analysis, information entropy analysis and differential attack analysis. The performance analysis tests revealed that the proposed algorithm is robust against cryptanalysis attacks.

KEYWORDS:

• Chaotic image Encryption
• Chosen plain text attack
• Hash key
• Logistic map
• LSM
• LTM
• Multiple chaotic map
• Sine map
• Tent map
• TSM

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

T. Gopalakrishnan

T. Gopalakrishnan received the BE degree in electrical and electronics engineering in 1998 from the Bharathiar University, Coimbatore, and the ME degree in applied electronics in 2003 from the Bharathiar University, Coimbatore. He is currently pursuing his PhD degree in the area of digital image processing at Anna University, Chennai, India.

He has 13 years of teaching experience and 5-year industry experience, working as an assistant professor (senior scale) in the Department of Electronics and Instrumentation Engineering, at Dr. Mahalingam College of Engineering and Technology, Pollachi, India. He is the Life Member of ISTE and Member of IACSIT. He has published 18 papers in international and national conferences proceedings. He has published three papers in international journals. His areas of research include digital image processing, watermarking, image compression and image encryption techniques.

E-mail: [email protected]

S. Ramakrishnan

S. Ramakrishnan received the BE degree in electronics and communication engineering in 1998 from the Bharathidasan University, Trichy, and the ME degree in communication systems in 2000 from the Madurai Kamaraj University, Madurai. He received his PhD degree in information and communication engineering from Anna University, Chennai in 2007.

He has 14 years of teaching experience and 1-year industry experience. He is a professor and the Head of the Department of Information Technology, Dr. Mahalingam College of Engineering and Technology, Pollachi, India.

Dr Ramakrishnan is a reviewer of 25 international journals such as IEEE Transactions on Image Processing, IET journals (formally IEE), ACM Computing Reviews, Elsevier Science Journals, Springer Journals, Wiley Journals, International Journal of Vibration and Control, etc. He is in the editorial board of seven international journals. He is a guest editor of special issues in three international journals including Telecommunication Systems Journal of Springer. He has published 129 papers in international, national journals and conference proceedings. Dr S. Ramakrishnan has published a book on wireless sensor networks for CRC Press, USA and two books on speech processing for InTech Publisher, Croatia and a book on computational techniques for Lambert Academic Publishing, Germany. He has also reviewed three books for McGraw Hill International Edition and 11 books for ACM Computing Reviews. He was the convenor of IT board in Anna University of Technology- Coimbatore Board of Studies (BoS). He is guiding 10 PhD research scholars. His biography has been included in Marquis Whos's Who in the World 2012 and 2016 editions. His areas of research include digital image processing, soft computing and human–computer interaction.

E-mail: [email protected]