Date of Award
5-2010
Document Type
Thesis
Degree Name
Master of Science (MS)
Legacy Department
Computer Engineering
Committee Chair/Advisor
Brooks, Richard R
Committee Member
Schalkoff , Robert J
Committee Member
Russell , Harlan B
Abstract
In most secure communication standards today, additional latency is kept to a minimum to preserve the Quality-of-Service. As a result, it is possible to mount side-channel attacks using timing analysis. In this thesis we discuss the viability of these attacks, and demonstrate them by inferring Hidden Markov Models of protocols. These Hidden Markov Models can be used to both detect protocol use and infer information about protocol state. We create experiments that use Markov models to generate traffic and show that we can accurately reconstruct models under many circumstances. We analyze what occurs when timing delays have enough jitter that we can not accurately assign packets to bins. Finally, we show that we can accurately identify the language used for cryptographically protected interactive sessions - Italian or English - on-line with as few as 77 symbols. A maximum-likelihood estimator, the forward-backward procedure, and confidence interval analysis are compared.
Recommended Citation
Bhanu, Harikrishnan, "Timing Side-Channel Attacks on SSH" (2010). All Theses. 781.
https://tigerprints.clemson.edu/all_theses/781