A Lightweight Image Encryption Algorithm Based on Chaotic Map and Random Substitution.

Area of Science:

• Cryptography and Information Security
• Applied Mathematics
• Computer Science

Background:

• Chaotic map-based image encryption is a decade-long research area.
• Existing methods often face trade-offs between encryption speed and security.
• Need for lightweight, secure, and efficient image encryption algorithms persists.

Purpose of the Study:

• To propose a novel, lightweight, secure, and efficient image encryption algorithm.
• To leverage logistic map, permutations, and AES S-box for enhanced encryption.
• To address the limitations of existing chaotic map-based encryption techniques.

Main Methods:

• Utilizes a logistic map for chaotic random number generation.
• Employs permutations and AES S-box for substitution operations.
• Generates initial logistic map parameters using SHA-2, pre-shared key, and initialization vector (IV).

Main Results:

• The proposed algorithm demonstrates significant speed improvements, up to 15.33x faster than contemporary methods.
• Comprehensive analysis using metrics like correlation coefficient, chi-square, and entropy confirms high security and quality.
• Evaluations include resistance to noise, data loss attacks, and key space analysis.

Conclusions:

• The developed algorithm offers a superior balance of speed, security, and efficiency for image encryption.
• It presents a viable solution for applications requiring robust and fast image data protection.
• The method effectively overcomes the speed-security trade-off in chaotic map-based encryption.