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Related Concept Videos

Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...

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Quasi-light Storage for Optical Data Packets
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Secure coherent optical communication via QKD-based parallel SHA-256 stream cipher with dual-randomized affine

Ying Zhang, Wenxiang Yao, Jiaqi Wang

    Optics Express
    |May 4, 2026
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    Summary

    This study introduces a novel stream cipher encryption scheme combining quantum key distribution (QKD) and Secure Hash Algorithm 256 (SHA-256) to boost key generation rates for secure communication.

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    Area of Science:

    • Cybersecurity
    • Quantum Information Science
    • Cryptography

    Background:

    • Quantum Key Distribution (QKD) offers information-theoretic security but suffers from low key generation rates.
    • High-speed classical optical communication demands faster encryption methods than traditional QKD alone can provide.

    Purpose of the Study:

    • To develop a high-speed, secure encryption scheme by integrating QKD with SHA-256.
    • To enhance the key generation rate while maintaining robust security.

    Main Methods:

    • A novel group-wise dual-randomized affine construction is proposed.
    • The scheme utilizes configurable grouping, parallel processing, dynamic initial vectors (IV), and variable full-domain strides.
    • A linear mapping is applied to data groups for deep orthogonalization of the hash input space.

    Main Results:

    • The proposed scheme achieves high-strength security protection and real-time communication performance.
    • Statistical analysis shows high ciphertext entropy, negligible autocorrelation, and high key sensitivity.
    • The effective computational search space is expanded beyond the 2^256 bound, countering pre-computation attacks.

    Conclusions:

    • The integrated QKD and SHA-256 stream cipher scheme effectively bridges the gap between QKD's security and classical communication's speed requirements.
    • The innovative affine construction ensures both security and performance, making it suitable for high-speed secure communication links.