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Secure Image Encryption Using Chaotic, Hybrid Chaotic and Block Cipher Approach.

Nirmal Chaudhary1,2, Tej Bahadur Shahi1,2, Arjun Neupane2

  • 1Central Department of Computer Science and IT, Tribhuvan University, Kathmandu 44600, Nepal.

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|June 23, 2022
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Summary
This summary is machine-generated.

This study compares chaos-based and Advanced Encryption Standard (AES) methods for secure image encryption. The hybrid chaotic map offers superior robustness against attacks, while AES provides stronger resistance to statistical analysis.

Keywords:
AESArnold cat mapblock cipherchaos theoryimage encryptionlogistic map

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Area of Science:

  • Computer Science
  • Cryptography
  • Information Security

Background:

  • Secure image transmission is critical in the digital age.
  • Encryption techniques are vital for protecting image data during transit.
  • Analyzing different encryption algorithms is essential for robust security.

Purpose of the Study:

  • To implement and analyze chaos-based and Advanced Encryption Standard (AES) image encryption techniques.
  • To evaluate the performance and security strengths of each method.
  • To compare their robustness against various types of cryptanalytic attacks.

Main Methods:

  • Chaos-based encryption using Arnold cat map and a hybrid chaotic map (logistic map).
  • Block cipher encryption using the Advanced Encryption Standard (AES).
  • Performance evaluation using Peak Signal to Noise Ratio (PSNR), Number of Pixels Change Rate (NPCR), Unified Average Changing Intensity (UACI), histogram analysis, and computation time.

Main Results:

  • The hybrid chaotic map demonstrated superior NPCR and UACI values, indicating higher robustness against differential and chosen-plaintext attacks.
  • The Arnold cat map showed computational efficiency.
  • AES exhibited lower PSNR values and greater histogram variation, suggesting stronger resistance to statistical attacks.

Conclusions:

  • Chaos-based encryption, particularly the hybrid approach, offers strong protection against specific attack vectors.
  • AES provides a robust defense against statistical analysis, crucial for data confidentiality.
  • The choice of encryption method depends on the specific security requirements and threat models.