IRC log of #maemo-devel for Thursday, 2011-03-17

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mase76hi all!17:44
mase76anybody there?17:49
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mase76i just wanted to introduce myself. i am the maintainer of cups.17:56
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SpeedEvilDocScrutinizer51: On that GSM crypto thing - on watching it - they haven't done it yet. Their only novel idea is finding a good codebook by feeding random bits into the GSM decoder, putting the outputs of that over a simulated channel, and comparing input and output bits.19:57
DocScrutinizer51lol19:58
DocScrutinizer51sounds to me like they are ignoring transitions completely20:00
SpeedEvilyes, it looked more interesting in preview than it actually was.20:00
DocScrutinizer51gsm codec is massive compression. compression is done by delta first instance. random noise is about worst thing to transmit. for example GSM might not allow arbitrary fast pitch/freq changes as human voice can't do that20:02
SpeedEvilyes.20:03
SpeedEvilBut feeding random bits into a GSM decoder, to see what voice-like signal it puts out is novel.20:04
DocScrutinizer51it's like trying to find the best snow/noise patterns for video to transmit data over mpeg2 or whatever20:04
SpeedEvilAnd seeing how that compares to the input signal.20:04
SpeedEvilErr - output signal20:04
DocScrutinizer51aaah, they decode random noise20:05
DocScrutinizer51via gsm codec20:05
SpeedEvilYes.20:05
DocScrutinizer51yeah that's nifty20:05
SpeedEvilIn practice, you'd need to have some nasty frame-edge tracker too.20:05
SpeedEvilWhich makes it much more annoying.20:05
DocScrutinizer51indeed20:06
SpeedEvilAnd the code->decode->pstn->encode->decode cycle will make that much more so.20:06
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