1 / 24

Recent Developments on Multimedia and Secure Networking Technologies

Recent Developments on Multimedia and Secure Networking Technologies. Chair Professor Chin-Chen Chang Feng Chia University National Chung Cheng University National Tsing Hua University. Multimedia (Watermarking). Classifications: Visible watermarking Invisible watermarking

grazia
Download Presentation

Recent Developments on Multimedia and Secure Networking Technologies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Recent Developments on Multimedia and Secure Networking Technologies Chair Professor Chin-Chen Chang Feng Chia University National Chung Cheng University National Tsing Hua University

  2. Multimedia (Watermarking) • Classifications: • Visible watermarking • Invisible watermarking • Robust watermarking • Semi-fragile watermarking • Fragile watermarking

  3. Multimedia (Watermarking) (Cont.) • Visible watermarking • Easy to embed • Clear to see watermark

  4. Multimedia (Watermarking) (Cont.) • Invisible watermarking • Requirements: • Good visual quality of watermarked image • Robustness Watermarking Original image Watermarked image Watermark

  5. Multimedia (Image authentication) • Requirements: • Detect the tampered area • Try to restore the tampered area • Solutions: • Hamming codes Tampered image Detected image Restored image Image

  6. Multimedia (Steganography) • Classification: • The target of modification • Frequency domain (e.g. DCT, DWT, DFT) • Spatial domain (e.g. pixel values) • Compression domain (e.g. VQ, LAC, SOC) • Stego image restoration • Irreversible data hiding • Reversible data hiding

  7. Multimedia (Steganography) (Cont.) • Irreversible data hiding • Requirements: • High capacity • Good visual quality of stego images • Solutions: • Using Sudoku • Using wet paper codes concept • Using Hamming codes

  8. Multimedia (Steganography) (Cont.) • Reversible • Requirements: • Fully reconstructing cover image • Good visual quality of stego image • High capacity • Solutions: • Data hiding in VQ indices • Data hiding in LAC codes • Data hiding in SOC codes • …

  9. Multimedia (Secret sharing) • Classification: • Meaningless shadows • Meaningful shadows • Meaningless shadows • Requirements: • Unexpected user can not see the secret image • Good visual quality of reconstructed secret image

  10. Multimedia (Secret sharing) (Cont.) Sharing Shadow size: 256  256 Image size: 512  512 Reconstructing (2,4)-threshold secret sharing scheme PSNR=24 dB

  11. Multimedia (Secret sharing) (Cont.) • Meaningful shadows • Requirements: • Good visual quality of stego image • Secret image extraction and reconstruction • Solutions: • Applying steganography techniques • Applying image authentication mechanisms

  12. Multimedia (Secret sharing) (Cont.) Reconstructing Hiding Stego-image Reconstructed secret image Secret image Stego-image (n,2)-threshold secret sharing scheme Stego-image

  13. Multimedia (Visual cryptography) • Requirements: • Secret message delivery • Unexpected user can not see the message from an individual share • Solutions: • Using shadow patterns • Using meaningful shadow images • Using Circle Shares

  14. Multimedia (Visual cryptography) (Cont.) Staking Shadow 1 Shadow 2 Secret

  15. Multimedia (Visual cryptography) (Cont.) Staking Shadow 1 Shadow 2 Secret

  16. Multimedia (Visual cryptography) (Cont.) Rotating 40o Staking Staking Share 2 Share 1 Secret 1 “VISUAL” Secret 2 “SECRET”

  17. Multimedia (Threshold) • Requirements: • Segment the objects on image • Low computation cost Threshold value T=53 Class 1 Class 2 Original image Segmented image Histogram

  18. Secure Networking • Fast Computation Algorithms for Cryptography • Requirements: • Large number computations • Low computation cost • Solutions: • Fast division algorithm using residue number system (RNS) • Fast conversion algorithms in RNS using Aryabhata remainder theorem (ART) • Fast RNS modular multiplication and exponentiation algorithms

  19. Secure Networking (Cont.) • Secure Communication • Secure E-mail protocols • Requirements • Reduce the computation cost of client devices • Achieve perfect forward secrecy • Solutions: • Using low cost functions (e.g. one-way hash functions)

  20. Secure Networking (Cont.) • Anonymity for Roaming Service • Requirements: • Avoid possible attacks (e.g. replay attacks, forgery attacks, known-key attacks) • Achieve the property of anonymity • Solutions: • Using low cost functions • Using smart card • Using nonce to replace timestamp

  21. Secure Networking (Cont.) • Authentication in WLAN • Requirements: • Prevent impersonation attacks • Protect personal privacy • Solutions: • Using mutual authentication • Feasible computational complexity • Using session keys

  22. Secure Networking (Cont.) • Key Exchange Remote Server Authentication Center (AC) IC Card Issuing Center 2. Service request 3. Authentication and key exchange 1. Issue an IC card Users

  23. Secure Networking (Cont.) • Requirements: • Freely choose identity and password • Password modification • Mutual authentication • Common session key distribution • Reduce computation cost

  24. Secure Networking (Cont.) • E-commerce Application • Electronic check • Payer’s identity appending • E-checks generation • Payer and payee verification • E-traveler’s check • Unique identity for the e-traveler’s check • E-traveler’s check can only be generated by check –issuing bank or an authorized organization

More Related