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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

¹School of Electronics Engineering, Vellore Institute of Technology (VIT), Vellore, 632 014, India.

Scientific Reports

|August 30, 2025

Summary

This summary is machine-generated.

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.

Keywords:

Chaotic maps Confusion-diffusion Digital security Image encryption Multimedia protection SHA-512

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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.