用人脸特征生成32位密钥，实现安全加密解密
Gradient-based facial encoding for key generation to encrypt and decrypt multimedia data
- 通过HOG+SVM提取人脸特征生成32位加密密钥
- 在25种文件上验证，熵值达7.99，满足随机性要求
- 适合安全共享、在线交易等需生物认证的场景
依赖密码的安全系统易被遗忘、猜测或攻破；独立运行的生物识别系统则面临模板伪造和重放攻击风险。本文提出一种基于人脸识别的生物密码系统，利用先进加密标准（AES）对多种文件类型进行加解密。该系统通过方向梯度直方图（HOG）提取面部边缘特征，并由支持向量机（SVM）分类，生成唯一32位加密密钥。即使在低光条件下，HOG仍能有效识别关键面部特征，确保密钥可重复生成且难以复制。密钥用于AES加密文本、音频、视频等25种文件格式。实验通过相关性分析、香农熵、归一化汉明距离及雪崩效应验证系统安全性。结果表明，密钥熵值达7.99，具备强随机性，且对输入微小变化敏感。该系统适用于安全文件共享、在线交易与数据存档，结合人脸独特性与AES可靠性，提供可信的信息保护方案。
原文摘要 · Abstract (English)
Security systems relying on passwords are vulnerable to being forgotten, guessed, or breached. Likewise, biometric systems that operate independently are at risk of template spoofing and replay incidents. This paper introduces a biocryptosystem utilizing face recognition techniques to address these issues, allowing for the encryption and decryption of various file types through the Advanced Encryption Standard (AES). The proposed system creates a distinct 32-bit encryption key derived from facial features identified by Histogram of Oriented Gradients (HOG) and categorized using Support Vector Machines (SVM). HOG efficiently identifies edge-aligned facial features, even in dim lighting, ensuring that reliable biometric keys can be generated. This key is then used with AES to encrypt and decrypt a variety of data formats, such as text, audio, and video files. This encryption key, derived from an individual's distinctive facial traits, is exceedingly challenging for adversaries to reproduce or guess. The security and performance of the system have been validated through experiments using several metrics, including correlation analysis, Shannon entropy, normalized Hamming distance, and the avalanche effect on 25 different file types. Potential uses for the proposed system include secure file sharing, online transactions, and data archiving, making it a strong and trustworthy approach to safeguarding sensitive information by integrating the uniqueness of facial biometrics with the established security of AES encryption.
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