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A lightweight multi round confusion-diffusion cryptosystem for securing images using a modified 5D chaotic system.

T Anujaa1, Afra Fathima Thajudeen Ali Ahamed1, Vedika Baranwal1

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This study introduces a novel image encryption algorithm using a modified 5D chaotic map and SHA-512 hashing. The system enhances digital image protection for secure communication in high-risk environments.

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Area of Science:

  • Cryptography
  • Information Security
  • Applied Mathematics

Background:

  • Modern communication systems face escalating threats to confidential information transmission.
  • Developing robust encryption methods is crucial for safeguarding sensitive data in digital environments.

Purpose of the Study:

  • To propose a novel image encryption algorithm utilizing a modified 5D chaotic map and SHA-512 hashing.
  • To enhance the security and randomness of digital image encryption for high-risk applications.

Main Methods:

  • A modified 5D chaotic map was developed and its chaotic properties analyzed using bifurcation diagrams and Lyapunov exponents.
  • A new image encryption algorithm was designed incorporating SHA-512 hashing and a confusion-diffusion architecture.
  • The randomness of the generated chaotic sequences was validated using the National Institute of Standards and Technology (NIST) test.

Main Results:

  • The modified 5D chaotic map demonstrated significant randomness, validated by NIST tests.
  • The encryption algorithm achieved high security metrics: NPCR of 99.6069% and UACI of 33.4284%.
  • High entropy value (7.99442) indicates strong resistance against statistical attacks.

Conclusions:

  • The proposed chaotic encryption system offers advanced security features for digital image protection.
  • The algorithm is suitable for multimedia, medical, and military applications requiring high-level data security.
  • This research highlights the effectiveness of chaotic systems in securing information in high-risk communication scenarios.