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    A new analytic method reveals vulnerabilities in optical cryptosystems using phase-shifting interferometry (PSI). This known-plaintext attack (KPA) allows perfect decryption key recovery, demonstrating a significant security flaw.

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    Area of Science:

    • Optics
    • Cryptography
    • Information Security

    Background:

    • Optical cryptosystems offer secure data transmission.
    • Phase-shifting interferometry (PSI) is a technique used in some optical encryption methods.
    • Known-plaintext attacks (KPA) are a common cryptanalytic threat.

    Purpose of the Study:

    • To introduce a novel analytic approach for known-plaintext attacks (KPA).
    • To assess the security of optical cryptosystems employing phase-shifting interferometry (PSI).
    • To demonstrate the vulnerability of PSI-based optical cryptosystems to KPA.

    Main Methods:

    • Development of a new analytic attack strategy.
    • Application of the analytic method to a PSI-based optical cryptosystem.
    • Simulation and analysis of attack outcomes.

    Main Results:

    • The proposed analytic method successfully recovers exact decryption keys.
    • Perfect attack results were achieved, confirming the method's efficacy.
    • The study demonstrates that PSI-based optical cryptosystems are susceptible to KPA.

    Conclusions:

    • Optical cryptosystems utilizing PSI are vulnerable to known-plaintext attacks.
    • The developed analytic approach provides a powerful tool for cryptanalysis of these systems.
    • This research highlights the need for enhanced security measures in PSI-based optical encryption.