Side-channel attack on labeling CAPTCHAs

08/08/2009
by   Carlos Javier Hernandez-Castro, et al.
0

We propose a new scheme of attack on the Microsoft's ASIRRA CAPTCHA which represents a significant shortcut to the intended attacking path, as it is not based in any advance in the state of the art on the field of image recognition. After studying the ASIRRA Public Corpus, we conclude that the security margin as stated by their authors seems to be quite optimistic. Then, we analyze which of the studied parameters for the image files seems to disclose the most valuable information for helping in correct classification, arriving at a surprising discovery. This represents a completely new approach to breaking CAPTCHAs that can be applied to many of the currently proposed image-labeling algorithms, and to prove this point we show how to use the very same approach against the HumanAuth CAPTCHA. Lastly, we investigate some measures that could be used to secure the ASIRRA and HumanAuth schemes, but conclude no easy solutions are at hand.

READ FULL TEXT
POST COMMENT

Comments

There are no comments yet.

Authors

page 11

01/26/2016

Polyhedron Volume-Ratio-based Classification for Image Recognition

In this paper, a novel method, called polyhedron volume ratio classifica...
06/08/2018

Provably Secure Integration Cryptosystem on Non-Commutative Group

Braid group is a very important non-commutative group. It is also an imp...
08/20/2021

Nonlinearity Attack against the Kirchhoff-Law-Johnson-Noise (KLJN) Secure Key Exchange Protocol

This paper introduces a new attack against the Kirchhoff-Law-Johnson-Noi...
06/21/2017

Uncertainty-Aware Organ Classification for Surgical Data Science Applications in Laparoscopy

Objective: Surgical data science is evolving into a research field that ...
11/09/2018

Mutual Heterogeneous Signcryption Schemes for 5G Network Slicings

With the emerging of mobile communication technologies, we are entering ...
10/12/2020

Vulgaris: Analysis of a Corpus for Middle-Age Varieties of Italian Language

Italian is a Romance language that has its roots in Vulgar Latin. The bi...
08/18/2021

Image Collation: Matching illustrations in manuscripts

Illustrations are an essential transmission instrument. For an historian...
This week in AI

Get the week's most popular data science and artificial intelligence research sent straight to your inbox every Saturday.