Reverse Engineering CAPTCHAs

@article{Hindle2008ReverseEC,
  title={Reverse Engineering CAPTCHAs},
  author={Abram Hindle and Michael W. Godfrey and Richard C. Holt},
  journal={2008 15th Working Conference on Reverse Engineering},
  year={2008},
  pages={59-68}
}
CAPTCHAs are automated Turing tests used to determine if the end-user is human and not an automated program. Users are asked to read and answer Visual CAPTCHAs, which often appear as bitmaps of text characters, in order to gain access to a low-cost resource such as webmail or a blog. CAPTCHAs are generated by software and the structure of a CAPTCHA gives hints to its implementation. Thus due to these properties of image processing and image composition, the process that creates CAPTCHAs can… CONTINUE READING

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