A low-cost attack on a Microsoft captcha

Jeff Yan, Ahmad Salah El Ahmad. A low-cost attack on a Microsoft captcha. In Peng Ning, Paul F. Syverson, Somesh Jha, editors, Proceedings of the 2008 ACM Conference on Computer and Communications Security, CCS 2008, Alexandria, Virginia, USA, October 27-31, 2008. pages 543-554, ACM, 2008. [doi]

@inproceedings{YanA08,
  title = {A low-cost attack on a Microsoft captcha},
  author = {Jeff Yan and Ahmad Salah El Ahmad},
  year = {2008},
  doi = {10.1145/1455770.1455839},
  url = {http://doi.acm.org/10.1145/1455770.1455839},
  researchr = {https://researchr.org/publication/YanA08},
  cites = {0},
  citedby = {0},
  pages = {543-554},
  booktitle = {Proceedings of the 2008 ACM Conference on Computer and Communications Security, CCS 2008, Alexandria, Virginia, USA, October 27-31, 2008},
  editor = {Peng Ning and Paul F. Syverson and Somesh Jha},
  publisher = {ACM},
  isbn = {978-1-59593-810-7},
}