Final published version
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
| Publication date | 2010 |
|---|---|
| Host publication | Proceedings of the 3rd European Workshop on System Security, EUROSEC'10 |
| Place of Publication | New York |
| Publisher | ACM |
| Pages | 36-41 |
| Number of pages | 6 |
| ISBN (print) | 9781450300599 |
| <mark>Original language</mark> | English |
| Event | 3rd European Workshop on System Security, EUROSEC'10 - Paris, France Duration: 13/04/2010 → 13/04/2010 |
| Conference | 3rd European Workshop on System Security, EUROSEC'10 |
|---|---|
| Country/Territory | France |
| City | Paris |
| Period | 13/04/10 → 13/04/10 |
| Conference | 3rd European Workshop on System Security, EUROSEC'10 |
|---|---|
| Country/Territory | France |
| City | Paris |
| Period | 13/04/10 → 13/04/10 |
CAPTCHA is a standard security technology that presents tests to tell computers and humans apart. In this paper, we examine the security of a new CAPTCHA that was deployed until very recently by Megaupload, a leading online storage and delivery website. The security of this scheme relies on a novel segmentation resistance mechanism. However, we show that this CAPTCHA can be segmented using a simple but new automated attack with a success rate of 78%. It takes about 120 ms on average to segment each challenge on a standard desktop computer.