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
-
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},
url = {https://eprint.iacr.org/2007/004}
}
