大数据-算法-用于重要电子文件保护的数字水印和数字指纹算法研究.pdf
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等级 labels into electronic files, which can indicate the importance of the documents and provide a foundation for hierarchical protection. The watermark algorithm should have high capacity and robustness against tampering. A novel watermarking algorithm based on Wavelet Packet Transform (WPT) and Discrete Cosine Transform (DCT) with CDMA (Code Division Multiple Access) technology is proposed. This algorithm enhances watermark embedding capacity through CDMA's spreading spectrum technique, while embedding watermarks in the low-to-medium frequency regions obtained from WPT to ensure both robustness and imperceptibility. To address geometric distortions, the image correction method utilizing Scale-Invariant Feature Transform (SIFT) feature points is adopted, ensuring the watermark's robustness against geometric attacks. Digital fingerprint technology, on the other hand, is used to prevent collusion attacks within the intranet. When the number of colluders is no more than two, the fingerprint algorithm should be able to identify all the colluding users. A cascaded coding approach is employed to design a digital fingerprint algorithm based on IPP (Identifiable Parent Property) codes. It constructs a 2-anti-framing code first, then a 2-safe code, and combines them with a chaotic sequence to form an inner code. An IPP code serves as the outer code, allowing the detection of colluding users with high probability without falsely accusing innocent users. When the number of colluders exceeds two, a TXiibo-based fingerprint algorithm is designed using a Turbo code as the outer code and a MIMO (Multiple-Input Multiple-Output) code as the inner code, with modifications to the outer code's decoding algorithm. This enhances the accuracy in identifying and tracking colluders compared to existing algorithms based on MIMO codes, providing better resistance to collusion attacks with shorter fingerprint code lengths. The research in digital watermarking and digital fingerprinting technologies has resulted in significant theoretical and practical achievements. These advancements contribute positively to the safeguarding of critical electronic documents and enhancing the overall information security within intranets. Key terms include: digital watermarking, digital fingerprinting, wavelet packet transform, discrete cosine transform, geometric attack, cascaded coding, and collusion attack.
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