July 2003 - cypherpunks-legacy

New Quantum Crypto Tested Over 100km, Sets New Record (fwd)
by Jim Choate 09 Jul '03

09 Jul '03

http://www.idg.net/ic_1326014_9720_1-5072.html -- ____________________________________________________________________ We are all interested in the future for that is where you and I are going to spend the rest of our lives. Criswell, "Plan 9 from Outer Space" ravage(a)ssz.com jchoate(a)open-forge.org www.ssz.com www.open-forge.org --------------------------------------------------------------------

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Re: Idea: The ultimate CD/DVD auditing tool
by Peter Fairbrother 08 Jul '03

08 Jul '03

okay I'm a bit pissed now. actually i'm raging pissed! Wheeee!!! the nyquist/lindquist/someone-else-who-was-pissed sampling theorems are based on the possibility of mathematically extracting frequencies from digital information in a STEADY_STATE situation. That doesn't mean that a speaker will properly reproduce those frequencies. Consider the dynamics of energy transfer. A digital signal at near-1/2-sampling frequency will have two datum points. The transitiion between them will be dramatic! the possibilities of energy transfer will not be comparable to an analogue sinusoidal waveform. And that's why good analogue is better then good digital. Doug Self etc. did some work on ultra-fast analogue systems in the mid 90's, and designed some amps that were and are regarded as pretty good - but afaik he didn't get the theory right. YAAAAHHH!-- Peter Fairbrother

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Re: Idea: The ultimate CD/DVD auditing tool
by Peter Fairbrother 08 Jul '03

08 Jul '03

I wrote: the nyquist/lindquist/someone-else-who-was-pissed sampling theorems are based on the possibility of mathematically extracting frequencies from digital information in a STEADY_STATE situation. That doesn't mean that a speaker will properly reproduce those frequencies. Consider the dynamics of energy transfer. A digital signal at near-1/2-sampling frequency will have two datum points. The transitiion between them will be dramatic! the possibilities of energy transfer will not be comparable to an analogue sinusoidal waveform. .... and i missed a bit or two. Consider the entropic uncertainty of a signal that has two-and-a-bit datums, against a sine wave. Start from zero, and go to such a waveform. Is it a constant-amplitude sine wave at frequency z? or a decaying sine at a frequency (z-at)? There's more, and it's to do with the limits of fourier and sampling theory. Say you have a wave at a frequency of z that's sampled according to nyquist theory. can you distinguish it from a wave of a frequency z - delta z? It can be done, but it takes a while, and a good few samples to do it. And a good analogue system will do it quicker. someone (hopefully not me, i haven't the time just now) can probably apply wavelet theory and get all this from steady-state theory, and tie it up in a nice package. -- Peter Fairbrother

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Re: Idea: The ultimate CD/DVD auditing tool
by Major Variola (ret) 08 Jul '03

08 Jul '03

At 03:14 PM 7/8/03 -0700, Tim May wrote: >As for hearing heterodyning in 28 KHz and 30 KHz signals, maybe. CD >players have brickwall filters to of course block such frequencies. >Some analog groove-based systems can have some kind of signal up there >at those frequencies, but not much. Regular vinyl is (was) also recorded with all kinds of filters, too, including the lowpass ones. If you cut vinyl (or metal) through a signal chain that didn't impose the filtering, perhaps the ultrasonics would remain, which is perhaps the analogophiles claim. You would need a special vinyl cutter though. Some of the filtering imposed on vinyl was to not fry the cutter, or otherwise deal with its inertia. (BTW, I thought your Monster USB cable was a prank.. its not.. some folks just don't get digital..)

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pegasus
by netkita＠earthlink.net 08 Jul '03

08 Jul '03

How do add the name of a person or group to the information folder that holds all my email addresses of persons that I email to on a regular basis . ` D

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RE: Idea: The ultimate CD/DVD auditing tool
by Anonymous via the Cypherpunks Tonga Remailer 08 Jul '03

08 Jul '03

> > As an audiophile (Krell+Levinson+Thiel gear at home), I definitely don't > > want to grab an analog signal. Doing that the signal is sure to retain > > characteristics of the extracting gear. But the vast majority of P2P kids > > won't care one iota that their file was analog for half a second. > > > > -TD > > > I'll ditto that - my brother is an extremist audiophile - he writes > reviews for the high-end stuff (google "Mike Trei"). Many (by > no means all) top end audophiles prefer all-analog equipment, > and direct-cut vinyl records (ie, the master disk was cut directly > at the performance, without a magtape master). I've listened to > some of this stuff, and it just blows digital away. What else do you expect, when any audiophile who denies that inaudible frequencies make the music "warmer" proves himself to be a philistine with ears of tin? Remember, it was the fashion and clothing EXPERTS who were the most insistent that the emperor's new clothes were absolutely marvelous.

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Re: Idea: The ultimate CD/DVD auditing tool
by Nomen Nescio 08 Jul '03

08 Jul '03

Tyler Durden leaves the fight club and writes: > Do you have a reference? I don't remember reading that SACD was encrypted. > What I DO remember is that the reason there's no standard SACD or DVD-A > digital interface is because the Industry wants that digital interface to be > encrypted. The detailed technical specs are apparently secret, but an overview of the multi-layered SACD copy protection is at http://www.sacd.philips.com/b2b/downloads/content_protection.pdf. If you don't like PDFs, most of the same information is at http://www.disctronics.co.uk/technology/dvdaudio/dvdaud_sacd.htm. Alan Clueless writes: > Furthermore, people have come to expect that they should be able to play > whatever disc shaped media in their computer. At some point there will > need to be a software based player. Both of the documents above specifically deny that software based players will be allowed. I get the impression that the decryption will always be done in hardware, and if a PC is ever able to play one of these gadgets, it will be a Palladium system or something similar that can be locked down. Steve Shear writes: > If you believe the article "Myths and Misconceptions about Hardware > Hacking," > http://www.cptwg.org/Assets/Presentations/ARDG/ARDGHardware_hack05-28-03.pdf > , recently posted to the Content Protection Technical Working Group, access > to affordable commercial technology for reverse engineering has given > hardware hackers the upper hand. That's mostly about how hardware hackers can use modern chips and custom PC boards without spending more than a few hundred dollars. Fine, but it's a long way from that to being able to pull an algorithm and/or device key out of a chip which has been designed to make that difficult.

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Re: Idea: The ultimate CD/DVD auditing tool
by Billy 08 Jul '03

08 Jul '03

On Tue, Jul 08, 2003 at 03:52:54PM -0400, Trei, Peter wrote: > Billy [SMTP:billy@dadadada.net] wrote: > > Bullshit detector buzzing. > > Is this *really* true? Have you tried it? > > Not personally, but The Net holds all knowledge. >... > http://www.bostonaes.org/archives/2003/Jan/ > http://www.acoustics.org/press/133rd/2pea.html Very interesting.. Thanks!

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RE: Idea: The ultimate CD/DVD auditing tool
by Trei, Peter 08 Jul '03

08 Jul '03

> Billy[SMTP:billy@dadadada.net] > > > On Tue, Jul 08, 2003 at 01:26:46PM -0400, Trei, Peter wrote: > > While the ear can't hear above 22KHz, signal above that *can* > > effect the perceived sound, by heterodyne effects. For example, > > if you play a single tone of 28KHz, or a single tone of 30 KHz, > > you can't hear them. Play them together, however, and you > > *can* hear a beat frequency of 2KHz. > > Bullshit detector buzzing. > Is this *really* true? Have you tried it? > > The beat frequency is an amplitude envelope around the 30kHz tone > (think AM). No part of its spectrum falls within audible range. > It shouldn't be audible at all. > Not personally, but The Net holds all knowledge. People are making real products using this technique. For example.... Here's a neat application - 'audio spotlights'. The directionality of a speaker is a function of the ratio of its diameter to the wavelength of the sound produced - by using an ultrasonic speaker with audible beat frequencies, you can make a small, very directional speaker: http://www.bostonaes.org/archives/2003/Jan/ http://www.acoustics.org/press/133rd/2pea.html Peter Trei

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RE: DNA of relative indicts man, cuckolding ignored
by Vincent Penquerc'h 08 Jul '03

08 Jul '03

> When AAA Insurance meets with Joe Sixpack to discuss his > health or life > or earthquake insurance, they seek to collect enough information to > have a reasonable chance of turning a profit on the deal. Else why > would they exist as a business? But there is a necessary asymmetry here. If you could determine with good precision whether someone will be affected by an illness, when, how much, etc, then this wouldn't work, save for superstition on the part of Joe Sixpack. Since the contract is based on a bet on the likelihood of premium/payouts balance, the more you can find out about the future of the insured person's organism future, the closer the premiums will match the payouts, reliably. *IF* you can determine this, of course. So the goal will be for the insurer to get access to as much info as possible to assess how to set the premiums, while preventing the insured from knowing as much, so there is still the uncertainty and the value of "peace of mind" gotten by the insured, and that's worth something too. The converse is also true. And both raise the problem of assessment of the data - how does the insurer get the data (getting DNA from the would be insured ? with the insured's knowledge or not ? From the contract clause that subordinates the insurance to the supplying of the data by the insured ? Will credit bureaus expand to cover this kind of thing ?) If there is total symmetry, insurance loses its point entirely. Could we see a gradual disappearance of some sorts of insurance for events that cease to be probabilistic ? Just musing. All of it already happens, but I'm curious about the limit of it (in the mathemetical sense) when the precision of the prediction tends towards infinity. -- Vincent Penquerc'h

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