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Updated: May 14, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Known-plaintext attack-based optical cryptosystem using phase-truncated Fresnel transform.

Sudheesh K Rajput¹, Naveen K Nishchal

¹Department of Physics, Indian Institute of Technology Patna, Patliputra, Patna, India.

|February 7, 2013

Summary

This summary is machine-generated.

This study enhances information security using a double random phase encoding framework. It introduces a novel method resistant to known-plaintext attacks, enabling secure image encryption and decryption.

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Area of Science:

Information Security
Optical Encryption
Cryptography

Background:

The basic double random phase encoding framework has limitations against known-plaintext attacks.
Existing methods require complex key generation and are vulnerable to cryptanalysis.

Purpose of the Study:

To propose an enhanced information security scheme with improved complexity and immunity against known-plaintext attacks.
To develop a robust encryption method using a phase-only mask (POM) and asymmetric keys.

Main Methods:

Utilizing a modified Gerchberg-Saxton algorithm to generate a phase-only mask (POM).
Employing the POM as a Fresnel domain key for encrypting data (random intensity mask - RIM) with a random phase mask.
Generating asymmetric keys through phase- and amplitude-truncation of the RIM.

Main Results:

Demonstrated successful encryption and decryption of multiple grayscale and color images.
Achieved high security with no crosstalk between encrypted images.
Validated the effectiveness of the known-plaintext attack concept for retrieving the POM using asymmetric keys.

Conclusions:

The proposed scheme offers enhanced security and robustness against known-plaintext attacks.
Decryption is straightforward and can be performed digitally or optically.
An optical setup for decryption has been proposed, highlighting practical applicability.