Comment by santaragolabs

That work is great. A related paper on earlier work where traffic analysis on skype was being done and where the researchers were able to extract individual phonemes and then reconstruct speech that way. It's one of my favorite papers. It's titled "Phonotactic Reconstruction of Encrypted VoIP Conversations" and you can find it here: http://www.cs.unc.edu/~fabian/papers/foniks-oak11.pdf