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Novel asymmetric cryptosystem based on distorted wavefront beam illumination and double-random phase encoding.

Honghao Yu, Jun Chang, Xin Liu

|April 26, 2017

Summary

This study introduces a novel optical security method using wavefront aberrations as keys to enhance double-random phase encoding (DRPE) cryptosystems against attacks. Simulations confirm its superior resistance capabilities.

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Area of Science:

Optics
Information Security
Cryptography

Background:

Conventional double-random phase encoding (DRPE) optical cryptosystems face security vulnerabilities.
Existing methods require enhancement to resist sophisticated attacks.

Purpose of the Study:

To propose a new security-enhancing method for DRPE optical cryptosystems.
To improve the resistance of DRPE systems against various attacks by employing wavefront aberrations as optical keys.

Main Methods:

Exploiting a beam-expander afocal-reflecting system with a deformable mirror to generate diverse wavefront aberrations.
Reconstructing wavefront aberrations using Zernike polynomial surface fitting.
Utilizing reconstructed aberrations as asymmetric vector keys, with ideal and distorted wavefronts serving as private and public keys.
Incorporating wavelength and focal length of the Fourier lens as additional keys.

Main Results:

Demonstrated the generation of controllable wavefront aberrations using a deformable mirror in an afocal-reflecting system.
Successfully reconstructed aberrations and employed them as novel asymmetric vector keys.
Simulations using ZEMAX and MATLAB validated the enhanced security and resistance of the proposed cryptosystem.

Conclusions:

The proposed method effectively enhances the security of DRPE optical cryptosystems.
Wavefront aberrations offer a robust mechanism for creating novel asymmetric keys.
The system shows improved resistance against known attacks on DRPE, highlighting its practical potential.