Na Ren

Title: Innovations of Na Ren in Watermarking Technologies

Introduction

Na Ren is a prominent inventor based in Nanjing, China, known for his contributions to watermarking information security technologies. He holds a total of four patents, showcasing his expertise and innovative approach in this specialized field. His work focuses on developing methods that enhance the security and robustness of data through advanced watermarking techniques.

Latest Patents

Na Ren's latest patents include a zero-watermarking method and device for Building Information Modeling (BIM) data. This invention addresses the limitations of existing zero-watermarking methods that are vulnerable to primitive attacks. By utilizing the vertical stability of a model, he constructs a mapping relationship between primitive clusters and watermarking bits. The method calculates norms of primitives within each cluster and employs the positivity and negativity of norm skewness measurements as eigenvalues to create a binary sequence. This sequence undergoes an XOR process with the original watermarking sequence to establish a secure zero-watermarking for BIM data. Experimental results demonstrate that this method possesses uniqueness, robustness, and security.

Another significant patent is the dual watermarking method for trajectory data, which combines robust and fragile watermarking techniques. This method employs an encryption algorithm to create robust watermark information. It identifies a farthest pair of feature points within a minimum convex hull as constant points. Utilizing quantization index modulation technology, robust watermark information is embedded into angles formed by feature points and constant points. The method groups trajectory points based on angles and distance ratios, embedding fragile watermark bits into these ratios. The watermark detection process aligns with the embedding, ensuring high robustness against translation, rotation, and scaling attacks.

Career Highlights

Na Ren has worked with notable institutions, including Nanjing Normal University and the Third Surveying and Mapping Institute of Hunan Province. His experience in these organizations has contributed to his development of innovative watermarking solutions.

Collaborations

Na Ren has collaborated with colleagues such as Changqing Zhu and Qianwen Zhou, who have supported his research and development efforts in watermarking technologies.

Conclusion

Na Ren's innovative work in watermarking technologies has significantly advanced the field of information security. His patents reflect a commitment to enhancing data protection through robust and secure methods. His contributions continue to influence the development of watermarking techniques in various applications.