[01] Isiaka A. Alimi, Department of Electrical and Electronics Engineering, School of Engineering and Engineering Technology, Federal University of Technology, Akure, Nigeria. [02] Oluyomi Aboderin, Department of Engineering and Space Systems, National Space Research and Development Agency, Abuja, Nigeria.

There have been significant developments in computer networking which have result in high rate of internet and multimedia application usage. However, transmission of images and other relevant information over such network can be compromised if adequate security is not employed. Consequently, security is a technical challenge in transmission and storage of digital images. Therefore, image encryption has been noted to be an efficient means of securing digital images and various encryption methods have been proposed in the literature. One of such method is chaos based image encryption technique in which random sequence is employed. This technique is relatively an efficient means of achieving fast and reliable encryption. Nevertheless, it has limited precision which necessitate an improved scheme to be developed. This paper presents image encryption algorithm with improved precision, confidentiality and security that exploits the existing algorithms. The effectiveness of the algorithm is evaluated by comparing the plaintext and the decrypted text using MATLAB®. The simulation results show that, the proposed scheme is viable and offers a reasonable degree of security. Also, there is no loss in the quality of digital images during the process.

Cryptography, Encryption, Decrypting, Key, Chaotic Map, Security

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