Countermeasure against estimation-based attacks of spread-spectrum watermarks
US7389421B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2002 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Jun 4, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Described herein is a technology for facilitating watermark detection. Spread-spectrum watermarking is a commonly employed technique for hiding data in digital goods (e.g., multimedia signals). Such watermarks may be potentially vulnerable to so-called “watermark estimation-based attacks.” At least one implementation, described herein, is an advancement over the traditional spread-spectrum watermark detector. At least one implementation, described herein, greatly discourages an estimation-based attack by an adversary. At least one implementation, described herein, determines whether a digital good has likely been subjected to an estimation-based attack and, at least, approximately reverses such attack. The scope of the present invention is pointed out in the appending claims.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.