Fast and Fair Handling of Multimedia CAPTCHA Flows

Ageliki N Tsioliaridou, Chi Zhang, Christos K Liaskos

Abstract


Multimedia CAPTCHAs play a crucial role in bot filtering policies for VoIP applications. Network flows carrying CAPTCHA content have a very small lifespan and require high transmission quality, making for special handling at transport layer. The present study introduces an analysis-derived, rapidly converging control mechanism for CAPTCHA flows. Instead of relying on generic heuristics, the novel scheme enables the flows to estimate their deviation from the equilibrium and adapt to it in a single step. Simulations demonstrate the high efficiency and convergence speed of the scheme, highlighting its unique fitness for the appointed task.

Keywords


congestion control, VoIP, CAPTCHA, fairness, convergence speed

Full Text:

PDF



International Journal of Interactive Mobile Technologies (iJIM) – eISSN: 1865-7923
Creative Commons License
Indexing:
Scopus logo IET Inspec logo DBLP logo EBSCO logo Ulrich's logo MAS logo