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Related Experiment Video

Updated: May 2, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

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A Complementary Approach for Securing and Anti-Counterfeiting of Valuable Documents Based on Encryption of

Zakaria E Ahmed^1,2, Rania M Abdelazeem³, Yasser A Attia¹

¹Laser Applications in Metrology, Photochemistry, and Agriculture Department, National Institute of Laser Enhanced Science, Cairo University, Giza 12613, Egypt.

Sensors (Basel, Switzerland)

|April 26, 2025

Summary

This study introduces a new method to secure documents by encrypting computer-generated holograms (CGHs) using XOR encryption. This approach offers robust protection against attacks, enhancing document security and anti-counterfeiting measures.

Keywords:

anti-counterfeiting computer-generated holograms document security

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Area of Science:

Optics and Photonics
Cryptography and Information Security
Digital Imaging

Background:

Traditional document security methods face challenges with digital and physical document protection.
Computer-generated holograms (CGHs) offer a unique medium for data embedding.
Existing encryption techniques may not fully address the vulnerabilities of holographic data.

Purpose of the Study:

To develop and evaluate a novel encryption method for computer-generated holograms (CGHs) to secure valuable documents.
To assess the effectiveness of XOR encryption combined with phase-only CGHs for document security.
To analyze the cryptographic robustness of the proposed approach against common attacks.

Main Methods:

Generation of phase-only CGHs using the iterative Fourier transform algorithm (IFTA).
Securing CGHs via binary phase randomization using symmetric XOR encryption.
Digital reconstruction using a decryption key and inverse Fourier transform (IFFT).
Physical document reconstruction involving printing and scanning.
Evaluation of reconstruction quality using speckle signal-to-noise ratio (SSNR).
Quantitative security analysis against plaintext and brute-force attacks.

Main Results:

The proposed method successfully generates and encrypts phase-only CGHs for document security.
Digital reconstruction quality was assessed via SSNR for grayscale and binary CGHs.
XOR-encrypted CGHs demonstrated robust protection against cryptographic attacks.
The combined approach offers effective security for both digital and physical documents.

Conclusions:

The integration of phase CGHs with XOR encryption provides a strong cryptographic solution for valuable document protection.
This novel approach enhances document security and offers significant potential for anti-counterfeiting applications.
The method is adaptable for securing both digital and physical document formats.