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Ciphertext-only attack on a joint transform correlator encryption system.

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    This study introduces a ciphertext-only attack (COA) for joint transform correlator (JTC) encryption. The method transforms the attack into a phase retrieval problem, successfully demonstrated through simulations.

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    Area of Science:

    • Optical Cryptanalysis
    • Information Security
    • Signal Processing

    Background:

    • Joint Transform Correlator (JTC) systems are used in optical encryption.
    • Ciphertext-only attacks (COAs) pose a significant threat to cryptographic systems.
    • Phase retrieval is a challenging problem in signal processing.

    Purpose of the Study:

    • To propose a novel ciphertext-only attack (COA) for Joint Transform Correlator (JTC) encryption systems.
    • To reframe the JTC encryption attack as a phase retrieval problem.
    • To demonstrate the feasibility of the proposed optical cryptanalysis method.

    Main Methods:

    • A ciphertext-only attack (COA) strategy is developed for JTC encryption.
    • The attack is reformulated as a phase retrieval problem using single intensity measurements.
    • The Hybrid Input-Output (HIO) algorithm is applied with signal domain support and frequency domain constraints.

    Main Results:

    • The proposed COA effectively addresses the JTC encryption vulnerability.
    • Numerical simulations validate the accuracy and feasibility of the phase retrieval approach.
    • The method successfully reconstructs information from intensity measurements.

    Conclusions:

    • The presented optical cryptanalysis technique offers a viable method for attacking JTC encryption.
    • Phase retrieval provides a powerful framework for solving JTC-based cryptanalytic problems.
    • The study highlights potential security weaknesses in JTC encryption systems.