A Novel Image Encryption Technique using Multi-Coupled Map Lattice System with Generalized Symmetric Map and Adaptive Control Parameter

Syed Muhammad Unsub Zia, M McCartney, Bryan Scotney, Jorge Martinez Carracedo, Ali Sajjad

Research output: Contribution to journalArticlepeer-review


The advent of high-speed internet has enabled ac- cess to multimedia to be considerably easier for the users. The use of image and video communication allows more in- formation to be shared while simultaneously presents higher risks in terms of data security. Image data has inherent prop- erties such as redundancy amongst the pixel values and bulk data capacity. These particular characteristics make tradi- tional encryption algorithms to require extensive computing resources and yet provide insufficient security. Unlike plain- text, an image comprises of a two-dimensional matrix where pixel intensity values that are integers in [0,255], leading to data redundancy problems. The use of conventional encryp- tion techniques can leave a pattern that could be exploited if a value is repeated several times in the ciphertext. These facts lead to the need of developing a cryptosystem able to encrypt every pixel value using a unique key and able to generate random patterns in the ciphertext. In this paper, a novel coupled map lattice system based cryptosystem us- ing generalised symmetric maps to generate pseudo-random sequences has been proposed. The generalization of sym- metric maps allows the user to choose the source of pseudo- random sequence generation by varying a single control pa- rameter. Other adaptive control parameters ensure an ad- equate degree of randomness in the generated sequences. The proposed encryption system relies on three indepen- dent sources of pseudo-random sequence generators, which are further re-randomized before the final encryption pro- cess. Comprehensive experimentation has been performed to test the proposed system against various attack models on publicly available datasets. A detailed and fair compar- ative analysis has also been conducted with existing state of the art image encryption techniques. Results show that the proposed algorithm provides high information entropy, negative correlation, large key space, high sensitivity to key variations, and is resistant to various types of attacks includ- ing chosen-text, statistical and differential attacks.
Original languageEnglish
Article number81
Pages (from-to)4
JournalSN Computer Science
Early online date6 Dec 2022
Publication statusPublished online - 6 Dec 2022


  • Encryption
  • Lattice
  • Symmetric Map
  • Coupled map lattice
  • Generalised symmetric map
  • Cryptography
  • Image encryption


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