Volume 8 - Issue 1
A novel Dynamic Key based chaotic image encryption
- R.Vidhya
Department of Computer science and Engineering, National Institute of Technology ,Trichy, India
vidhu.cs111@gmail.com
- M.Brindha
Department of Computer science and Engineering, National Institute of Technology ,Trichy, India
brindham@nitt.edu
Keywords: Hyper chaos, Dynamic keys, Image encryption, Security
Abstract
Many encryption algorithms are proposed based on chaos and many of them have been shown to be
successful because of the adapting nature of the traditional confusion-diffusion architecture. Still few
problems have been identified. The plain image is not related with the cipher image which induces
the chosen /known plain text attack. Further the keys used for the encryption is always fixed and is
not chosen dynamically. In order to reduce these flaws, a novel chaotic encryption is proposed with
dynamic keys selected from plain image itself. For the key generation, hyper chaos system is used
along with the sum of the intensity values to encrypt the image with high security. The pixel change
rate and changed intensity values are as high as 99.7123 and 33.4432 respectively which exhibit the
resistance against chosen/known plain text attack. Simulations are performed for histogram analysis,
correlation between adjacent pixels, entropy analysis and sensitivity analysis which reveals that the
proposed scheme have good security which in turn can be adopted for secure communication applications.