Secure Fractal Image Coding

TL;DR

This paper introduces a secure fractal image coding scheme that encrypts select parameters during encoding, ensuring image security without altering file format or incurring significant computational costs.

Contribution

The paper proposes a novel method for encrypting fractal image parameters during encoding, enhancing security while maintaining efficiency and compatibility.

Findings

Encrypted images can only be decrypted with the correct key.

The method preserves image quality and format.

Encryption incurs minimal computational overhead.

Abstract

In recent work, various fractal image coding methods are reported, which adopt the self-similarity of images to compress the size of images. However, till now, no solutions for the security of fractal encoded images have been provided. In this paper, a secure fractal image coding scheme is proposed and evaluated, which encrypts some of the fractal parameters during fractal encoding, and thus, produces the encrypted and encoded image. The encrypted image can only be recovered by the correct key. To keep secure and efficient, only the suitable parameters are selected and encrypted through in-vestigating the properties of various fractal parameters, including parameter space, parameter distribu-tion and parameter sensitivity. The encryption process does not change the file format, keeps secure in perception, and costs little time or computational resources. These properties make it suitable for secure image encoding or transmission.