Optical single-channel cryptosystem based on the discrete wavelet transform and the chaotic standard map for...

Area of Science:

• Optics and Photonics
• Information Security
• Digital Image Processing

Background:

• Traditional cryptosystems struggle with efficient and secure multi-image encryption, especially for color images.
• Existing methods often lack robustness or require complex multi-channel processing.
• The need for enhanced security in digital image transmission is paramount.

Purpose of the Study:

• To propose a novel single-channel asymmetric cryptosystem for multi-image encryption in CMYK color mode.
• To leverage the inverse discrete wavelet transform (IDWT) for encoding CMYK images into a real-valued 2D format.
• To enhance security using a chaotic standard map for generating random phase masks.

Main Methods:

• Encoding CMYK color images into a real-valued 2D format using the inverse discrete wavelet transform (IDWT).
• Generating a chaotic standard phase mask (CSPM) utilizing the chaotic standard map for improved security and large key space.
• Encrypting the encoded 2D image in the linear canonical transform domain using the CSPM.

Main Results:

• Demonstrated the feasibility and effectiveness of the proposed optical cryptosystem through numerical simulations.
• Achieved single-channel implementation for CMYK color image encryption, a novel approach.
• The cryptosystem exhibits superior performance compared to existing relevant methods.
• The proposed scheme can be extended for direct encryption of multiple color images.

Conclusions:

• The proposed optical single-channel asymmetric cryptosystem offers a secure and efficient solution for multi-image encryption in CMYK mode.
• The integration of IDWT and chaotic standard map significantly enhances the security and performance of color image encryption.
• The method is robust, outperforms existing techniques, and has potential for broader applications in secure image transmission.