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An efficient and compromise-resilient image encryption scheme for resource-constrained environments.

Abdul Nasir Khan1, Abid Mehmood2, Muhammad Nasir Mumtaz Bhutta2

  • 1COMSATS University Islamabad, Abbottabad Campus, Khyber Pakhtunkhwa, Pakistan.

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Summary
This summary is machine-generated.

This study presents a lightweight image encryption method using image tiling and chaotic sequences. It enhances security and efficiency by reducing computational load during encryption and decryption.

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Area of Science:

  • Computer Science
  • Cryptography
  • Image Processing

Background:

  • Current image cryptosystems using chaotic sequences face scalability issues with image size, increasing computational demands.
  • Existing lightweight schemes often compromise between privacy and efficiency, with some revealing patterns or imposing heavy computational loads.

Purpose of the Study:

  • To introduce a novel, lightweight image encryption scheme that addresses the computational burden and privacy concerns of existing methods.
  • To improve the efficiency and security of image encryption through a tile-based chaotic sequence generation approach.

Main Methods:

  • The proposed scheme partitions images into uniformly sized tiles.
  • A chaotic sequence is generated based on the tile size, significantly smaller than the original image dimensions.
  • This reduces the computational complexity associated with generating extensive chaotic sequences.

Main Results:

  • The developed scheme is confirmed to be lightweight and secure compared to state-of-the-art methods.
  • Sensitivity analysis yielded a high Normalized Pseudorandom Change Rate (NPCR) of 99.96% and a low Unified Average Changing Intensity (UACI) of 33.48%.
  • These metrics indicate strong resistance to differential attacks.

Conclusions:

  • The proposed tile-based chaotic sequence generation offers an efficient and secure solution for image encryption.
  • The scheme effectively balances privacy and computational efficiency, making it suitable for practical applications.
  • The demonstrated resistance to differential attacks validates its security robustness.