All about uncertainties and traps: Statistical oracle-based attacks on a new CAPTCHA protection against oracle attacks
All about uncertainties and traps: Statistical oracle-based attacks on a new CAPTCHA protection against oracle attacks
复制标题
关于不确定性和陷阱:基于统计预言机的攻击,针对新的验证码防范预言机攻击
DOI:
10.1016/j.cose.2020.101758
复制
发表时间:
2020
影响因子:
5.6
通讯作者:
Hernández-Castro C
中科院分区:
文献类型:
--
作者:
Hernández-Castro C
CAPTCHAs are security mechanisms that try to prevent automated abuse of computer services. Many CAPTCHAs have been proposed but most have known security flaws against advanced attacks. In order to avoid a kind of oracle attacks in which the attacker learns about ground truth labels via active interactions with the CAPTCHA service as an oracle, Kwon and Cha proposed a new CAPTCHA scheme that employ uncertainties and trap images to generateadaptiveCAPTCHA challenges, which we call “Uncertainty and Trap Strengthened CAPTCHA” (UTS-CAPTCHA) in this paper. Adaptive CAPTCHA challenges are used widely (either explicitly or implicitly) but the role of such adaptive mechanisms in the security of CAPTCHAs has received little attention from researchers.In this paper we present a statistical fundamental design flaw of UTS-CAPTCHA. This flaw leaks information regarding ground truth labels of images used. Exploiting this flaw, an attacker can use the UTS-CAPTCHA service as an oracle, and perform several different statistical learning-based attacks against UTS-CAPTCHA, increasing any reasonable initial success rate up to 100% according to our theoretical estimation and experimental simulations. Based on our proposed attacks, we discuss how the fundamental idea behind our attacks may be generalized to attack other CAPTCHA schemes and propose a new principle and a number of concrete guidelines for designing new CAPTCHA schemes in the future.
登录
查看更多内容
DOI:
--
发表时间:
2023
期刊:
影响因子:
--
作者:
Hiroaki Motohashi;Kien Nguyen;Hiroo Sekiya;池松泰彦
通讯作者:
池松泰彦
影响因子:
4.3
作者:
Mario Cagalj;T. Perković;M. Bugarić;Shujun Li
通讯作者:
Shujun Li
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
Carlos Javier Hernández Castro
通讯作者:
Carlos Javier Hernández Castro
DOI:
--
发表时间:
2017
期刊:
Future generations computer systems
影响因子:
--
作者:
Meriem Guerar;A. Merlo;M. Migliardi
通讯作者:
M. Migliardi
DOI:
10.1109/tifs.2017.2718479
发表时间:
2017-06
影响因子:
6.8
作者:
Margarita Osadchy;Julio Hernandez-Castro;S. Gibson;O. Dunkelman;Daniel Pérez-Cabo
通讯作者:
Margarita Osadchy;Julio Hernandez-Castro;S. Gibson;O. Dunkelman;Daniel Pérez-Cabo