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An Image Encryption Algorithm Based on Time-Delay and Random Insertion.

Xiaoling Huang1, Guodong Ye1

  • 1Faculty of Mathematics and Computer Science, Guangdong Ocean University, Zhanjiang 524088, China.

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This study introduces a novel image encryption algorithm using a chaotic map. The permutation-insertion-diffusion (PID) method enhances security by linking keystream generation to secret keys and image data.

Keywords:
chaotic mapimage encryptioninformation entropyrandom insertiontime-delay

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Area of Science:

  • Computer Science
  • Cryptography
  • Image Processing

Background:

  • Traditional image encryption relies on permutation-diffusion structures.
  • Existing methods often have limitations in keystream dependency and security strength.

Purpose of the Study:

  • To present a novel image encryption algorithm that enhances security.
  • To improve upon traditional permutation-diffusion methods by integrating secret keys and image data into the keystream generation.

Main Methods:

  • The proposed algorithm utilizes a chaotic map for encryption.
  • A permutation stage incorporates a middle parameter for temporal delay.
  • A diffusion stage involves inserting random numbers (acting as a one-time pad) into the permuted image.

Main Results:

  • The algorithm generates a keystream dependent on secret keys and pre-processed image data.
  • The permutation and diffusion stages are intertwined, strengthening overall security.
  • Experimental results demonstrate superior performance for secure image communications.

Conclusions:

  • The permutation-insertion-diffusion (PID) algorithm offers a robust approach to image encryption.
  • The integration of chaotic maps, secret keys, and image data enhances encryption security.
  • The PID algorithm is well-suited for secure image communication applications.