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mase76 | hi all! | 17:44 |
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mase76 | anybody there? | 17:49 |
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mase76 | i just wanted to introduce myself. i am the maintainer of cups. | 17:56 |
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SpeedEvil | DocScrutinizer51: 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 |
DocScrutinizer51 | lol | 19:58 |
DocScrutinizer51 | sounds to me like they are ignoring transitions completely | 20:00 |
SpeedEvil | yes, it looked more interesting in preview than it actually was. | 20:00 |
DocScrutinizer51 | gsm 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 that | 20:02 |
SpeedEvil | yes. | 20:03 |
SpeedEvil | But feeding random bits into a GSM decoder, to see what voice-like signal it puts out is novel. | 20:04 |
DocScrutinizer51 | it's like trying to find the best snow/noise patterns for video to transmit data over mpeg2 or whatever | 20:04 |
SpeedEvil | And seeing how that compares to the input signal. | 20:04 |
SpeedEvil | Err - output signal | 20:04 |
DocScrutinizer51 | aaah, they decode random noise | 20:05 |
DocScrutinizer51 | via gsm codec | 20:05 |
SpeedEvil | Yes. | 20:05 |
DocScrutinizer51 | yeah that's nifty | 20:05 |
SpeedEvil | In practice, you'd need to have some nasty frame-edge tracker too. | 20:05 |
SpeedEvil | Which makes it much more annoying. | 20:05 |
DocScrutinizer51 | indeed | 20:06 |
SpeedEvil | And the code->decode->pstn->encode->decode cycle will make that much more so. | 20:06 |
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