On 1/31/14, Daniel Kahn Gillmor <[email protected]> wrote: > i'd be curious to know what other people's intuitions are on this. I > haven't done signal-processing work in years, and i know very little > about speech timing analysis mechanisms.
If (a) the users will tolerate enough latency for the MITM box to buffer about a word of speech, and (b) the attacker can get some advance information about the users' dialect, it sounds like a fun problem for a grad student. My understanding is that the major part of speaker recognition is the ‘glottal pulse’ (which can easily be extracted from any voiced phoneme), and the next most likely thing that a human would notice is general pronunciation of words (e.g. general American vs. New York accent vs. British Received Pronunciation). Once you know how the user speaks in general, just detect the magic word and stomp it with a synthesized replacement. Robert Ransom _______________________________________________ Messaging mailing list [email protected] https://moderncrypto.org/mailman/listinfo/messaging
