3D Lorenz chaotic map to 4D hyperchaos: A comparison based on image encryption

Internet is playing a major role in the modern era of faster communication. Information communicated over internet must be secured with robust encryption scheme to assure confidentiality. Encryption schemes using chaotic maps provide high level of security to transmitted information. Robustness of cryptographic technique further improves with application of hyperchaos rather than lower dimensional chaotic maps. In this communication we have studied comparison between image encryption techniques developed based on 3D Lorenz chaotic system and 4D hyperchaos. Performance analysis of both the techniques are compared based on various parameters like key sensitivity analysis, key space analysis, histogram analysis, calculation of information entropy and correlation coefficients.