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Novel structures of chaos-based parallel multiple image encryption and FPGA implementation.

Thang Manh Hoang1, Pham Quang Anh2, Manh-Hai Hoang3

  • 1School of Electrical and Electronic Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, 11600, Hanoi, Vietnam. thang.hoangmanh@hust.edu.vn.

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Summary
This summary is machine-generated.

This study introduces novel chaos-based multiple image encryption methods that overcome limitations of existing algorithms. The new cryptosystems efficiently encrypt and decrypt images of varying sizes and bit depths separately, enhancing security and performance.

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Area of Science:

  • Cryptography
  • Image Processing
  • Computer Science

Background:

  • Massive image data generation necessitates efficient and confidential encryption methods.
  • Chaos-based image encryption offers effective data correlation reduction and confidentiality.
  • Existing multiple image encryption algorithms often require same-sized images and simultaneous decryption, leading to inefficiencies.

Purpose of the Study:

  • To propose novel chaos-based multiple image encryption structures that address limitations of current algorithms.
  • To enable encryption and decryption of image cohorts with varying sizes and bit depths.
  • To allow separate decryption of selected ciphertext images from a cohort, improving efficiency.

Main Methods:

  • Developed three novel structures for chaos-based multiple image encryption integrating permutation, substitution, and diffusion processes in different orders.
  • Employed a perturbed chaotic map and a linear-feedback shift register to generate session keys with image-content dependency.
  • Utilized session keys for enhanced security through image-content dependency.

Main Results:

  • Proposed cryptosystems successfully handle image cohorts with different sizes and bit representations.
  • Individual ciphertext images can be decrypted separately, saving time and energy.
  • Statistical analysis (NIST randomness test, entropy, histogram, correlation) and security analysis (key space, sensitivity) confirm effectiveness.
  • Hardware implementation on FPGA demonstrated high throughput and efficiency.

Conclusions:

  • The proposed chaos-based multiple image encryption structures offer significant improvements in flexibility, security, and efficiency over existing methods.
  • These novel approaches are suitable for practical applications requiring high-speed and confidential processing of diverse image data.
  • The findings pave the way for more robust and adaptable image encryption solutions in various domains.