Harakrishnan Bhanu

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Protocol tunneling is widely used to add security and/or privacy to Internet applications. Recent research has exposed side channel vulnerabilities that leak information about tunneled protocols. We first discuss the timing side channels that have been found in protocol tunneling tools. We then show how to infer Hidden Markov models (HMMs) of network(More)
Recent research has exposed timing side channel vulnerabilities in many security applications. Hidden Markov models (HMMs) have used timing data to extract passwords from cryptographically protected communications tunnels. We extend that work to show how HMM models of protocols can be extracted directly from observations of protocol timing artifacts with no(More)
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