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A secure and adaptive block-based image encryption: a novel high-speed approach

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Abstract

In the era of digital communication, ensuring the security of transmitted images is paramount, particularly for online and real-time applications where data privacy and integrity are essential. This paper introduces a novel image encryption algorithm designed to address the rigorous demands of such contexts, prioritizing both security and speed. Employing SHA-512 as the secret key and leveraging block-based encryption techniques, the proposed algorithm offers security and adaptability to various image sizes and aspect ratios, catering to the diverse needs of modern applications. The algorithm enhances security by incorporating chaotic systems for key generation and permutation while maintaining high-speed encryption and decryption processes. Performance evaluation demonstrates the algorithm’s resilience against common cryptographic attacks, underscoring its effectiveness in safeguarding sensitive image data in dynamic online and real-time contexts. Notably, the algorithm achieves encryption speeds of up to 438.49 Mbps for images sized 1080 × 1920, with an encryption time of just 0.108 s as well as 0.26 s for an image sized 2611 × 1800. For a Lena color image sized 512 × 512, the proposed algorithm results in an entropy of 7.999252, an NPCR value of 99.6365, a UACI value of 33.4542 and encryption time of 0.0254 s. With adaptability to diverse image characteristics and a robust defense against potential threats, the proposed algorithm emerges as a promising contender for ensuring the integrity and confidentiality of digital images in today’s interconnected world.

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Data availability

The datasets and pseudo-code of the current study’s encryption and decryption are available from the corresponding author upon reasonable request.

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Funding

This work is supported by the Natural Science Foundation of Zhejiang Province, China, under No. LD24F020002 and partly supported by the National Natural Science Foundation of China under Grant Nos. 62072412, 61902359, 61702148, and 61672468, the Opening Project of Shanghai Key Laboratory of Integrated Administration Technologies for Information Security under Grant AGK2018001, the Program for Youth Innovation in Future Medicine, Chongqing Medical University, No. W0150 and the Natural Science Foundation of Chongqing, China, No. cstc2021jcyjmsxmX0132.

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  1. Collegeof Computer Science and Technology, Zhejiang Normal University, Jinhua, China

    Sajid Khan & Hao Peng

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Khan, S., Peng, H. A secure and adaptive block-based image encryption: a novel high-speed approach. Nonlinear Dyn 112, 16445–16473 (2024). https://doi.org/10.1007/s11071-024-09870-8

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