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Structural Digital Signature for Image Authentication: An Incidental Distortion Resistant Scheme

This report discusses a Structural Digital Signature scheme for image authentication that is robust against distortions. It explores scenarios during the authentication process, utilizing wavelet coefficients for authentication. The study presents experimental results, discussions on scalability, complexity, and sensitivity, and concludes highlighting the scheme's effectiveness in distinguishing malicious tampering from incidental alterations.

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Structural Digital Signature for Image Authentication: An Incidental Distortion Resistant Scheme

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  1. Structural Digital Signature for Image Authentication: An Incidental Distortion Resistant Scheme Source: IEEE Transactions on Multimedia, Vol. 5, No. 2, pp. 161-173, 2003 Authors: Chun-Shien Lu and Hong-Yuan Mark Liao Reporter: Jen-Bang Feng

  2. Outline • Digital Signature • Scenarios During the Authentication Process • SDS Based on Interscale Relation of Wavelet Coefficients • Ex. Results • Discussions • Conclusions

  3. Examples of Digital Signature

  4. Possible Scenarios During the Authentication Process

  5. Parent-children Pair

  6. Structural Digital Signature (SDS) • Parent-children pair in Wavelet Trans. SDS(I): 0 <= i,j <= 1, o is the position index

  7. Structural Digital Signature (SDS) Symbol I: p > 0, c > 0 Symbol II: p > 0, c < 0 Symbol III: p < 0, c > 0 Symbol IV: p < 0, c < 0 Record the Symbols as the signature

  8. Verification Completeness of SDS:

  9. Ex. Results 22~4 scales when σ = 256 22~4 scales when σ = 128

  10. Ex. Results 22~4 scales when σ = 256 22~4 scales when σ = 128

  11. Ex. Results

  12. Ex. Results

  13. Ex. Results

  14. Discussions • Num. of scales • Complexity • False Positive & False Negative • Relation between σ and robustness • Relation between σ and sensitivity • If image intensity is changed • If the selected parent-children pair are known and changed

  15. Conclusions • Threshold value determines the size of the authentication message. • Malicious tampering is distinguished from incidental modifications. • Tampered regions are localized. • The recovery of the tampered region is not provided.

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