Berkeley CSUA MOTD:Entry 18283
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2000/5/16-18 [Science/GlobalWarming, Computer/SW/Security] UID:18283 Activity:high
5/16    http://www.wired.com/news/politics/0,1283,36339,00.html

        Question: How exactly can you distinguish Voice traffic
                  from other traffic, esp. when you can tunnel it
                  over another protocol like http or you encrypt
                  it using SSL and such?
                  What the hell do the telco's want regulated?
        \_ It's just political clap trap noise.
           \_ But, technically, unencrypted voice traffic is hella
              easy to detect, regardless of protocol.  Anyone who
              knows basic signal processing can write the code.  -blojo
              \_ what's the easy trick? does the spectrum for speech look very
                 specific? -ali
                 \_ What you would basically do is: (a) look for signals
                    that have most of their energy in the 500Hz-4KHz range.
                    (b) The amount of energy and its centroid oscillate /
                    fluctuate with periods that are O(.25 seconds).
                    Basically you can look at docs for any of the recent
                    vocoders and see what circumstances they focus on
                    reproducing... fortunately recognition that something
                    is probably a voice is a lot easier than recognizing
                    what the voice is saying.   -blojo
                    \_ Key phrase: unencrypted.  Solution: encrypt it.
                        \- you know the NSA has a patent on automatically
                        IDing FAX and some other kinds of traffic. --psb
                    \_ i've got something that fluctuates at 4 Hz right down
                       here. -ali
                       \_ Wow.  That sounds painful...or unsatisfying.  Not
                          sure which....
ERROR, url_link recursive (eces.Colorado.EDU/secure/mindterm2) 2025/05/24 [General] UID:1000 Activity:popular
5/24    

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