Report

reCAPTCHA: Human-Based Character Recognition via Web Security Measures

Science  12 Sep 2008:
Vol. 321, Issue 5895, pp. 1465-1468
DOI: 10.1126/science.1160379

Log in to view full text

As a service to the community, AAAS/Science has made this article free with registration.

Subjects

Navigate This Article