Introduction and
Security Projects
Distributed Applications
Preventing massive automated access to Web resources      

Automated web tools are used to achieve a wide range of different tasks, some of which are legal activities, whilst others are considered attacks to the security and data integrity of online services. For this reason, effective solutions to counter the threat represented by such programs are required.
We have studied the problem of massive automated access to web resources and we have developed MosaHIP, a Mosaic-based Human Interactive Proof (HIP, also known as CAPTCHA). Properties of the proposed solution grant an improved security over usual text-based and picture-based HIPs, whereas the user-friendliness of the system alleviates the user from the discomfort of typing any text before accessing to a web content.

Papers (selection)  

A. Basso, S. Sicco, Preventing massive automated access to Web resources Comput. Secur. (2009), Vol. 28 No. 3-4, pp. 174-188, DOI: 10.1016/j.cose.2008.11.002, Elsevier 2009. [ pdf ]

A. Basso, Protecting Web resources from massive automated access Technical report RT114/08 - Computer Science Department, University of Torino, 2008. [ pdf ]

Software and Links  

MosaHIP Demo

More info? Contact person is Francesco Bergadano: bergadano[at]


Dept. of
Computer Science
University of
Web Technology
Web Technology