Characterizing and Detecting Malicious Crowdsourcing

摘要

Popular Internet services in recent years have shown that remarkable things can be achieved by harnessing the power of the masses. However, crowd-sourcing systems also pose a real challenge to existing security mechanisms deployed to protect Internet services, particularly those tools that identify malicious activity by detecting activities of automated programs such as CAPTCHAs. Thus they would perform poorly or be easily bypassed when attacks are generated by real human workers inside a crowd-sourcing system.