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    Area of Science:

    • Cryptography
    • Optical Engineering
    • Information Security

    Background:

    • Existing optical cryptosystems often use amplitude information for plaintext.
    • Equal Modulus Decomposition (EMD) is a technique used in generating cryptosystem masks.
    • Security enhancements in optical cryptosystems are crucial for protecting sensitive data.

    Purpose of the Study:

    • To evaluate the security of a novel optical cryptosystem combining full phase encoding with EMD.
    • To identify and exploit potential security vulnerabilities in the enhanced cryptosystem.
    • To propose new attack methodologies to assess the system's robustness.

    Main Methods:

    • The study analyzes a cryptosystem where phase-encoded plaintext is used as input for EMD-based mask generation.
    • Two novel iterative attacks are developed, employing normalization operators and phase-retrieval techniques.
    • Numerical simulations are conducted to validate the proposed attack strategies.

    Main Results:

    • The security-enhanced optical cryptosystem, despite initial assumptions of improved security, is found to be susceptible to attacks.
    • The proposed iterative attacks, utilizing normalization and phase-retrieval, effectively demonstrate the system's security risks.
    • The number of constraints in iterative attacks was reduced, but this did not eliminate security vulnerabilities.

    Conclusions:

    • The investigated full phase encoding and EMD-based optical cryptosystem presents significant security risks.
    • The proposed iterative attacks are feasible and effective in compromising the security of the enhanced scheme.
    • Further research is needed to develop more secure optical cryptosystem designs.