Analysis of tagging variants of Sequenced Tagged Captcha (STC)

Author

Raj, Aditya ; Jain, Ashish ; Pahwa, Tushar ; Jain, Abhimanyu

Author_Institution

Dept. of Inf. Technol., Netaji Subhas Inst. of Technol., New Delhi, India

fYear

2009

fDate

26-27 Sept. 2009

Firstpage

427

Lastpage

432

Abstract

CAPTCHAs, a form of Human Interactive Proof (HIP), are means of enforcing security on web systems. The resources of these web systems are misused by automated `bot´ programs which indulge in spamming and other unscrupulous activities. The objective of a CAPTCHA is to successfully identify and allow access to human users as against to these bots. To defeat all currently known CAPTCHA breaking techniques, the STC scheme was proposed. In this paper, we expand the STC scheme by identifying its variants based on the nature of `Tagging´. These variations occur in Tagging of characters and/or numbers in the CAPTCHA image. An in-depth analysis based on Readability and Security of the variant schemes is performed and concluded with a comparative result.

Keywords

Internet; identification technology; interactive systems; security of data; CAPTCHA breaking techniques; CAPTCHA image; Web systems; automated bot programs; character tagging; human interactive proof; readability; security; sequenced tagged Captcha; spams; Automatic testing; Discussion forums; Educational institutions; Hip; Humans; Information analysis; Information security; Information technology; Performance analysis; Tagging;

fLanguage

English

Publisher

ieee

Conference_Titel

Science and Technology for Humanity (TIC-STH), 2009 IEEE Toronto International Conference

Conference_Location

Toronto, ON

Print_ISBN

978-1-4244-3877-8

Electronic_ISBN

978-1-4244-3878-5

Type

conf

DOI

10.1109/TIC-STH.2009.5444461

Filename

5444461