CAPTCHA is a simple challenge-response tool to determine whether the user is a bot or human. The user must answer required text, calculate questions, or choose some images from the provider’s choice. D portal site, which is one of the most famous web portal site in Korea, asks text response in CAPTCHA image when joining a cafe group, but this CAPTCHA is structured in a very regular format which can be read very simply if used repeatedly. We can read the text characters by bot with very high accuracy through some easy steps, among 2,000 sample CAPTHCAs.
|Title of host publication||Information Security Applications - 18th International Conference, WISA 2017, Revised Selected Papers|
|Editors||Brent ByungHoon Kang, Taesoo Kim|
|Number of pages||10|
|Publication status||Published - 2018|
|Event||18th World International Conference on Information Security and Application, WISA 2017 - Jeju Island, Korea, Republic of|
Duration: 2017 Aug 24 → 2017 Aug 26
|Name||Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)|
|Other||18th World International Conference on Information Security and Application, WISA 2017|
|Country/Territory||Korea, Republic of|
|Period||17/8/24 → 17/8/26|
Bibliographical noteFunding Information:
Acknowledgments. This work was supported by Defense Acquisition Program Administration and Agency for Defense Development under the contract (UD060048AD).
ASJC Scopus subject areas
- Theoretical Computer Science
- Computer Science(all)