Vulnerability Development mailing list archives
Re: Audio fingerprinting (was Re: hacksdmi?)
From: Lincoln Yeoh <lyeoh () POP JARING MY>
Date: Sun, 15 Oct 2000 15:41:10 +0800
At 02:02 AM 10/14/00 -0400, Geoff Schmidt wrote:
On the other hand, it only takes a couple of bits to store a watermark, and there's huge amounts of redundancy in audio, so the hide and seek game could go on for quite a while.
If you only need to write 32 bits into a 120 second long song it doesn't look too bad. But once you start trying to shove PKI type keys into it, woohoo. A bit a second at 90db S/N is probably noticeable to the "Golden Ears" folks out there, so good luck getting 10 bits a sec.... I think Shannon's famous formula will help tell you how much you have to play with given an acceptable signal level for music. It doesn't tell you how to do it, but at least it's easy to prove at which point it becomes very difficult. As you said audio compression will make things even more difficult. Cheerio, Link.
Current thread:
- Audio fingerprinting (was Re: hacksdmi?) Geoff Schmidt (Oct 13)
- Re: Audio fingerprinting (was Re: hacksdmi?) Thierry (Oct 14)
- Re: Audio fingerprinting (was Re: hacksdmi?) Geoff Schmidt (Oct 14)
- Re: Audio fingerprinting (was Re: hacksdmi?) Bluefish (P.Magnusson) (Oct 16)
- Re: Audio fingerprinting (was Re: hacksdmi?) Geoff Schmidt (Oct 14)
- Re: Audio fingerprinting (was Re: hacksdmi?) Lincoln Yeoh (Oct 15)
- Re: Audio fingerprinting (was Re: hacksdmi?) Geoff Schmidt (Oct 16)
- Re: Audio fingerprinting (was Re: hacksdmi?) Thierry (Oct 14)