Paper 2007/004

Cryptanalysis of Hwang-Chang’s a Time-Stamp Protocol for Digital Watermarking

Jue-Sam Chou, Yalin Chen, and Chung-Ju Chan

Abstract

In 2005, Hwang et al. [17] proposed a time-stamping protocol for digit watermarking. They claimed that their scheme is secure against attacks. However, in this article, we will show that their scheme is not secure enough for that when the owner of the image sends both the encrypted session key and image to the TSS, the attacker can intercept these transmitted data. Then, he can launch an off-line attack to analyze these intercepted data. We will describe the attacker’s action in this article. After that, we propose an improved scheme to prevent this off-line attack.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Published elsewhere. Unknown where it was published
Keywords
Digital watermarksCopyright protectionTime-stamping
Contact author(s)
jschou @ mail nhu edu tw
History
2007-01-04: received
Short URL
https://ia.cr/2007/004
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2007/004,
      author = {Jue-Sam Chou and Yalin Chen and Chung-Ju Chan},
      title = {Cryptanalysis of Hwang-Chang’s a Time-Stamp Protocol for Digital Watermarking},
      howpublished = {Cryptology ePrint Archive, Paper 2007/004},
      year = {2007},
      note = {\url{https://eprint.iacr.org/2007/004}},
      url = {https://eprint.iacr.org/2007/004}
}
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