Content-based document signature: ongoing work
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1 Content-based document signature: ongoing work Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty L3i laboratory, University of La Rochelle GDR Sécurité Informatique réunion 31 Mai
2 Outline 1 Motivation 2 Context 3 Image Hashing Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 2/17
3 Motivation Counterfeit documents are created easily in paper and digital formats Paper document security: watermarking and ngerprinting [1],[2] Digital document security: electronic signature [3] Goal: study hybrid document security by hashing its content Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 3/17
4 Outline 1 Motivation 2 Context 3 Image Hashing Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 4/17
5 SHADES project SHADES: Semantic Hash for Advanced Document Electronic Signature Securing hybrid documents by hashing the document's content Partners: researchers from computer science and law domains Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 5/17
6 Scheme for SHADES Figure: Algorithm for content-based hashing [Eskenazi, Gomez-Krämer, Ogier 2015] Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 6/17
7 Example Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 7/17
8 Outline 1 Motivation 2 Context 3 Image Hashing Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 8/17
9 Perceptual Image Hash (PIH) PIH is a compact representation used to verify the integrity of an image Desirable properties of PIH Unpredictability Robustness against Content Preserving Operations Discrimination to Content Changeing Operations Compactness Two types of PIH Unkeyed PIH Keyed PIH Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 9/17
10 ASYCHA [Eskenazi, Bodin, Gomez-Krämer, Ogier 2017] Registration: reduce rotation and scale variations caused by print and scan, need second order moments and resolutions of two images Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 10/17
11 ASYCHA-Hash Generation Preprocessing: Inversion: want to compare the foreground Down-sampling: remove noise and small color variations caused by P&S Indexation on 32 colors: remove colorimetric noise caused by P&S Normalization: compensate for illumination variation caused by P&S Feature Extraction: Resolution produced by the scanner Second order moments Index matrix and its color mapping table Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 11/17
12 Improvement Advantages: High stability w.r.t. P&S Improvement: Security: keyed perceptual image hash Hash computation Digest compactness Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 12/17
13 Keyed Image Hashing Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 13/17
14 Ongoing work Keep the same features as those of ASYCHA algorithm Add a vector of pseudo random Key Compute and compress or quantizatize a hash Analyze the security and robustness of this hash Compute the dierential entropy of the hash function Use ROC curves to evaluate the robustness and discrimination Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 14/17
15 Example Features x 1, x 2,...x n Key K = K 1 K 2...K n, where K i is a pseudorandom variable that is normally distributed with mean µ and variance σ 2 [4] ith hash value h i = k i x i Dierential entropy of h i N(h i ) = ˆ E(h i ) = µx i Var(h i ) = σ 2 x 2 i h i log 2 1 h i dk = 1 2 [ log2 ( 2πeσ 2 x 2 i ) + 1 ] Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 15/17
16 References [1] Aravind et al.signature-embedding in printed documents for security and forensic applications.proc. SPIE 5306, Security, Steganography, and Watermarking of Multimedia Contents VI, (22 June 2004) [2] Ali al Haj et al. Copyright protection of e-government document images using digital watermarking,information Management (ICIM), rd International Conference on [3]Andrew David McCabe Thomas H. Gonser.Systems and methods for distributed electronic signature documents.us Patent US B2, 2015 [4]Swaminathan, A., Mao, Y., Wu, M.: Robust and secure image hashing. IEEE Transactions on Information Forensics and Security 1(2) (June 2006) Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 16/17
17 Thank you for your attention Anh Thu Phan Ho, Petra-Krämer Gomez and Mickaël Coustaty 17/17
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