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Re: Idea: The ultimate CD/DVD auditing tool (meow)
by Tyler Durden 10 Jul '03

10 Jul '03

Somebody wrote... >Yes this is for localization ---clicks are broadband, you need to >identify which freq components are used. I still think >humans can't discriminate the phase of a tone. An interesting thing to try is to play with the "phase" button on many high-end gear. This supposedly matters for low frequencies, but despite my unarguably golden ears, I'm still not convinced I can hear the difference. My Thiel speakers, however, claim to be "phase coherent", and that seems to be an entirely different matter. In other words, the different frequency components of a sound are transmitted in correct phase relationships (ie, true to the original sound), and the result is a (sometimes) astonishing level of spacial detail. Of course, non-audiophiles will poo-poo that claim, but even they will hear that the Thiels are far more accurate than the crap that's sold in Circuit City or whatever. So I figure I may as well believe Jim Thiel's claim that phase coherence is important in a speaker. -TD >From: Mike Rosing <eresrch(a)eskimo.com> >To: "cypherpunks(a)lne.com" <cypherpunks(a)lne.com> >Subject: Re: Idea: The ultimate CD/DVD auditing tool (meow) >Date: Wed, 9 Jul 2003 14:32:53 -0700 (PDT) > >On Wed, 9 Jul 2003, Major Variola (ret) wrote: > > > Yes this is for localization ---clicks are broadband, you need to > > identify which freq components are used. I still think > > humans can't discriminate the phase of a tone. In fact, MP3s > > use this to cut bits. > >They can tell relative phase, but it takes a lot of training. > > > After the experiments, the cats > > will be ok, as I assume they're sufficiently > > plastic, unless you do brain staining on them. :-( Or your policy is > > the > > Tim McVeigh treatment. > >both. They spend a year training the cats, then a year or 2 collecting >data, then brain stain, then vaporize. Each cat is worth about $1M when >it's all done, and it's got a lot of skull missing while it's alive. >But it's well protected with a lot of aluminum and epoxy :-) > > > Cool stuff, though my domestic feline wants to know where you live. > > > > PS: have you identified the "can opener sound" brain-center yet? > >I think you better keep it far away! And no, they don't play with >higher order systems. The low level stuff is hard enough!! > > > Cats manage biometrics and reputation better than most human systems.. > >:-) > >Patience, persistence, truth, >Dr. mike _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

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Slashdot | Russians Order Mobile Phone Encryption Removed (fwd)
by Jim Choate 10 Jul '03

10 Jul '03

http://slashdot.org/articles/03/07/10/0036232.shtml?tid=158&tid=99 -- ____________________________________________________________________ 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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Slashdot | Webcaster Alliance Threatens To Sue RIAA (fwd)
by Jim Choate 10 Jul '03

10 Jul '03

http://yro.slashdot.org/yro/03/07/09/2037258.shtml?tid=123&tid=99 -- ____________________________________________________________________ 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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pegasus
by netkita＠earthlink.net 09 Jul '03

09 Jul '03

How do i use my privite and public keyrings to encrypt email. I think that I have the file part and then use as an attatchment ok Thanks

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[9fans] security hole (fwd)
by Jim Choate 09 Jul '03

09 Jul '03

---------- Forwarded message ---------- Date: Wed, 9 Jul 2003 20:07:05 -0400 From: David Presotto <presotto(a)closedmind.org> To: 9fans(a)cse.psu.edu Subject: [9fans] security hole I plugged a security hole in Plan 9. It involved the state of a process after it did a newns(). Newns() is used to create a new namespace, usually after a process has changed uid (like when someone attaches to a server: telnet, ssh, ...). Newns opens a file, called a namespace file, that describes the new namespace and then follows the instructions inside (see /lib/namespace). Newns(2) creates a new namespace, but until the process calling newns does a chdir through /, it's local directory is still in the old name space. If the process then navigates the name space using relative commands (chdir(".."), open("../lib/profile")) it is walking the space using the priviledges of the OLD user id. Because of the way namespaces are usually set up, this doesn't normally happen. All the normal namespace files themselves do a chdir to /usr/$user effectively leaving the old namespace before newns returns. However, if either there wasn't such a chdir in the namespace file, i.e., if you've removed it for your installation or /usr/$user (and also /usr/none) doesn't exist then it was possible for a user to log in (for example via telnet or ssh) and end up in a directory like /usr/bootes in which they still had the rights of bootes. Neither situation applied to the labs since we have a /usr/none but one user in Japan (YAMANASHI Takeshi <uncover(a)beat.cc.titech.ac.jp>) discovered it when he created an account with no home dir. I changed newns() to fix the problem. It now always leaves you chdir'd into a directory in the current namespace. It does that by first seeing if the namespace file has already caused a chdir through the root. If not, it effectively does a chdir(getpwd). If that fails, it does a chdir("/"). This is a change in semantics. I haven't found (by inspection) any programs that would be bothered by it but please tell me if you see anything fishy since I'm about to update sources with the change. I've been running our servers here with the change for a few days and all seems well.

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Re: Idea: The ultimate CD/DVD auditing tool (meow)
by Major Variola (ret) 09 Jul '03

09 Jul '03

At 11:45 AM 7/9/03 -0700, Mike Rosing wrote: >On Wed, 9 Jul 2003, Major Variola (ret) wrote: >> Actually I thought humans are insensitive to phase relations, modulo >> inter-aural timing at low frequencies for spatial location. Perhaps >> that >> is what you meant? But spatial location isn't the same as the >> frequency-fetishing >> audiophiles go for. To do that well you need casts of the outer ear >> too. > >No, if you put 2 clicks out that are 10 usec's apart on right and >left, most people can pick out which side came first. 90% of the >time anyway. Yes this is for localization ---clicks are broadband, you need to identify which freq components are used. I still think humans can't discriminate the phase of a tone. In fact, MP3s use this to cut bits. >> You doing owl-type studies on auditory localization? Audio-visual >> mapping >> and plasticity? Making the cats wear funky glasses? > >Yup. they sew coils into their eyes. For humans they use contacts :-) >PETA is definitly a problem :-) Gaak. I was thinking prism-glasses maybe bolted on that translate the vis field. Its ok for undergrads so its ok for cats. After the experiments, the cats will be ok, as I assume they're sufficiently plastic, unless you do brain staining on them. :-( Or your policy is the Tim McVeigh treatment. Cool stuff, though my domestic feline wants to know where you live. PS: have you identified the "can opener sound" brain-center yet? ---- Cats manage biometrics and reputation better than most human systems..

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Re: Idea: The ultimate CD/DVD auditing tool
by Tyler Durden 09 Jul '03

09 Jul '03

"Actually I thought humans are insensitive to phase relations, modulo inter-aural timing at low frequencies for spatial location. Perhaps that is what you meant? But spatial location isn't the same as the frequency-fetishing audiophiles go for." Au contrare...frequency accuracy vs spatial resolution is the classic Uncertainty principal in high end. A real high-end system present the ear with a truly 3-D soundscape...some instruments are clearly in the foreground, some are clearly in the background, and some are even higher than others. With a good recording, the hall ambience is also there. Put a great live recording on a great high-end sound system and "you are there". -TD >From: "Major Variola (ret)" <mv(a)cdc.gov> >To: "cypherpunks(a)lne.com" <cypherpunks(a)lne.com> >Subject: Re: Idea: The ultimate CD/DVD auditing tool >Date: Wed, 09 Jul 2003 10:59:39 -0700 > >At 07:15 PM 7/8/03 -0700, Mike Rosing wrote: > >To produce 65kHz (for cats) my present boss prefers a 1 MHz sample >rate. > >Do cats buy a lot of audiophile equiptment :8=|| > > >The human hearing system is capable of noticing phase relations at >100kHz > >rates. > >Actually I thought humans are insensitive to phase relations, modulo >inter-aural timing at low frequencies for spatial location. Perhaps >that >is what you meant? But spatial location isn't the same as the >frequency-fetishing >audiophiles go for. To do that well you need casts of the outer ear >too. > >You doing owl-type studies on auditory localization? Audio-visual >mapping >and plasticity? Making the cats wear funky glasses? _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

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Re: Idea: The ultimate CD/DVD auditing tool
by Major Variola (ret) 09 Jul '03

09 Jul '03

At 07:15 PM 7/8/03 -0700, Mike Rosing wrote: >To produce 65kHz (for cats) my present boss prefers a 1 MHz sample rate. Do cats buy a lot of audiophile equiptment :8=|| >The human hearing system is capable of noticing phase relations at 100kHz >rates. Actually I thought humans are insensitive to phase relations, modulo inter-aural timing at low frequencies for spatial location. Perhaps that is what you meant? But spatial location isn't the same as the frequency-fetishing audiophiles go for. To do that well you need casts of the outer ear too. You doing owl-type studies on auditory localization? Audio-visual mapping and plasticity? Making the cats wear funky glasses?

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Re: [CI] Re: Finding collision resistant hash functions
by Major Variola (ret) 09 Jul '03

09 Jul '03

At 02:59 AM 7/9/03 -0700, Sarad AV wrote: >hi, >> MV: >>There's nothing gained by >> increasing >> the input entropy (compressing > >I was looking for such a compression function such >that the chances of collision in the message digest >obtained by hashing these 2^80 messages is collision >free or very low probability of collision or in other >words I dont want the birthday attack to work on it. > >If i hash 2^80 messages they should be equidistibuted >in such a manner that it does not affect the security >of the algorithm. Again, unless you know something about the distribution of your input AND their interaction with your chosen hash function, you gain nothing by remapping (compression or otherwise) your input. And again, a good hash function will disperse your input randomly, regardless of its clustering. So pick a crypto-like hash function (which guarantees random dispersion) and use it. You can't do better unless you "cheat" and know your input before you pick a hash function. And picking pathological inputs (to cause collisions) will be hard. e.g., hash=0 while (input) hash = hash ^ DES( input, fixed_key ) return hash The only reason to compress would be to cut down the number of DES operations, useful only if compression is cheaper than DES.

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Grey-World
by Steve Schear 09 Jul '03

09 Jul '03

An excellent site for those interested in tunneling, covert channels, network related steganographic methods developments. http://gray-world.net/ "There is no protection or safety in anticipatory servility." Craig Spencer

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