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Conference Papers Year : 2011

Analyzing Key-Click Patterns of PIN Input for Recognizing VoIP Users

Ge Zhang
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Abstract

Malicious intermediaries are able to detect the availability of VoIP conversation flows in a network and observe the IP addresses used by the conversation partners. However, it is insufficient to infer the calling records of a particular user in this way since the linkability between a user and a IP address is uncertain: users may regularly change or share IP addresses. Unfortunately, VoIP flows may contain humanspecific features. For example, users sometimes are required to provide Personal identification numbers (PINs) to a voice server for authentication and thus the key-click patterns of entering a PIN can be extracted from VoIP flows for user recognition. We invited 31 subjects to enter 4-digital PINs on a virtual keypad of a popular VoIP user-agent with mouse clicking. Employing machine learning algorithms, we achieved average equal error rates of 10-29% for user verification and a hitting rate up to 65% with a false positive rate around 1% for user classification.
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hal-01567602 , version 1 (24-07-2017)

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Ge Zhang. Analyzing Key-Click Patterns of PIN Input for Recognizing VoIP Users. 26th International Information Security Conference (SEC), Jun 2011, Lucerne, Switzerland. pp.247-258, ⟨10.1007/978-3-642-21424-0_20⟩. ⟨hal-01567602⟩
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