MATLAB scripts for analyzing and breaking the UTS-CAPTCHA scheme proposed in the following paper. Note that the name UTS-CAPTCHA was not used by the authors of the following paper, but was proposed by us (a group of researchers: Carlos Javier Hernandez-Castro, Shujun Li and Maria D. R-Moreno).

Shinil Kwon and Sungdeok Cha. 2016. A Paradigm Shift for the CAPTCHA Race: Adding Uncertainty to the Process. IEEE Software 33, 6 (Nov 2016), 80-85. DOI:10.1109/MS.2016.32

To cite our work, use the following information:

Carlos Javier Hernández-Castro, Shujun Li and María D. R-Moreno, "All About Uncertainties and Traps: Statistical Oracle-based Attacks on a New CAPTCHA Protection Against Oracle Attacks," Computers & Security, Volume 92, Article Number 101758, 2020
https://doi.org/10.1016/j.cose.2020.101758
http://www.hooklee.com/Papers/CompSec2020.pdf
https://kar.kent.ac.uk/80266/

@ARTICLE{HcLRm:CAPTCHA:CompSec2020,
  author =       {Hernández-Castro, Carlos Javier and Li, Shujun and R-Moreno, María~D.},
  title =        {All About Uncertainties and Traps: Statistical Oracle-based Attacks on a New {CAPTCHA} Protection Against Oracle Attacks},
  journal =      {Computers \& Security},
  year =         {2020},
  volume =       {92},
  articleno =    {101758},
  numpages =     {12},
  pages =        {101758:1--101758:12},
  doi =          {10.1016/j.cose.2020.101758},
}