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    Area of Science:

    • Computer Science
    • Cryptography
    • Optical Engineering

    Background:

    • Traditional double random phase encoding (DRPE) optical cryptosystems offer a method for secure data transmission.
    • Implementing perfect forward secrecy (PFS) aims to enhance key management and session security in DRPE systems.
    • Analyzing the security vulnerabilities of enhanced DRPE schemes is crucial for robust cryptographic solutions.

    Purpose of the Study:

    • To evaluate the security of a DRPE-based optical cryptosystem incorporating perfect forward secrecy (PFS).
    • To identify specific attack vectors and vulnerabilities within the enhanced DRPE cryptosystem during a single session.
    • To assess the effectiveness of PFS in mitigating known plaintext attacks and the system's susceptibility to modified plaintext attacks.

    Main Methods:

    • Security analysis of a DRPE optical cryptosystem employing PFS.
    • Development and application of modified plaintext attack algorithms.
    • Validation of attack effectiveness through numerical simulations.

    Main Results:

    • The DRPE cryptosystem with PFS demonstrates advantages in key management.
    • The system is secure against conventional plaintext attacks.
    • Vulnerabilities exist against modified chosen and known plaintext attacks within the same session.
    • Proposed attack algorithms successfully retrieve the original plaintext.

    Conclusions:

    • While PFS improves key management in DRPE, it does not fully secure the system against all plaintext attacks.
    • The analyzed optical cryptosystem is susceptible to specific modified plaintext attacks, compromising data integrity.
    • Further research is needed to address identified vulnerabilities and enhance the overall security of DRPE-based optical cryptosystems.