June 2002 - cypherpunks-legacy

RE: PGP and Speak Freely (fwd)
by Eugen Leitl 08 Jun '02

08 Jun '02

-- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> ______________________________________________________________ ICBMTO: N48 04'14.8'' E11 36'41.2'' http://www.leitl.org 57F9CFD3: ED90 0433 EB74 E4A9 537F CFF5 86E7 629B 57F9 CFD3 ---------- Forwarded message ---------- Date: Sat, 08 Jun 2002 03:42:12 -0500 From: "Benjamin T. Moore, Jr." <btmoore(a)iname.com> To: ed(a)kapitein.net, speak-freely(a)fourmilab.ch Subject: RE: PGP and Speak Freely -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ok, let me see if I can maybe clarify what the issue is... Speak Freely offers the ability to encrypt your voice conversations in real time. If you have the "Crypto capable" version, when you've made a connection to someone, you both can enter an agreed upon key and your conversation will be secure from that point forward. This of course creates several problems. If someone is listening in, monitoring your conversation/traffic or packet sniffing, if for instance, you were to say in the conversation, lets use the word "monkey" for an IDEA key and you both typed in the word "monkey," your conversation would be encrypted using "monkey" as an IDEA key. The problem of course is, if someone is monitoring your conversation, they'd of heard you agree upon a key and they'd simply enter in the same key and continue to monitor. Thus, you need a method of securely exchanging either an agreed upon key or a generated key - Speak Freely will generate keys that you may copy and paste into any of the various windows for the various encryption algorithms. PGP, Pretty Good Privacy, is one damn good method of securely exchanging those keys. You may of course e-mail the key in an encrypted e-mail or file to the intended recipients or you could even send the encrypted file using several of the Instant Messaging Clients with a file transfer protocol. These methods will certainly work very well. However, take this example which happened to me just last evening. A friend and I were needing to set up a secure conversation. After we couldn't get Speak Freely to handle the key exchange, we decided to e-mail the key in a PGP encrypted e-mail. Trouble was, the mail server was down on his ISP. He could neither receive or send mail. If he hadn't had an auxiliary web-based e-mail account, things might have been more complex than they were. If Speak Freely were functioning correctly... let me amend that, IF we KNEW how to make Speak Freely handle the key exchange as described in the help file... It would have been a simple matter for us to allow Speak Freely to handle the key exchange. What is supposed to happen is... in the "connection" tab, you should be able to type the key identifier for the person(s), Speak Freely will then launch PGP - which it does - encrypt the generated key and transmit it to the intended recipients. This would automate secure communications. - -- Benjamin T. Moore, Jr. - <btmoore(a)iname.com> ICQ UIN - 8159114 *The Price of Freedom is Self-Reliance! The Cost is Education!* - -----Original Message----- From: owner-speak-freely(a)fourmilab.ch [mailto:owner-speak-freely@fourmilab.ch]On Behalf Of ed(a)kapitein.net Sent: Friday, June 07, 2002 6:14 AM To: btmoore(a)iname.com; speak-freely(a)fourmilab.ch Subject: Re: PGP and Speak Freely Hi, I have used PGP with speakfreely on unix. it worked just fine ( in command line mode, not with the GUI ). I did not used a key exhange option, you can just sent (by e-mail) your pgp public key to te recipient and ask him to email you his public key. I don't know of any need for keyexchange within SF itself. am I missing something ? please give some more detail on the needed key exchange option. Kind regards, @ On Fri, 07 Jun 2002 04:30:26 -0500 "Benjamin T. Moore, Jr." <btmoore(a)iname.com> wrote: >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >Anyone gotten Speak Freely to do a PGP key exchange? Using Speak Freely >version 7.2 and PGP 658... > >- -- >Benjamin T. Moore, Jr. - <btmoore(a)iname.com> ICQ UIN - 8159114 >*The Price of Freedom is Self-Reliance! The Cost is Education!* > >-----BEGIN PGP SIGNATURE----- >Version: 6.5.8ckt http://www.ipgpp.com/ > >iQA/AwUBPQB9MnDnKKP6IdMiEQK8UwCfbzRmIrXrxTRgAkaW3JebiATGF7gAoLgv >w7ferAcCgAcm42xY9Cg6fydm >=GDim >-----END PGP SIGNATURE----- > > > * * * > >To unsubscribe from this mailing list, send E-mail containing >the word "unsubscribe" in the message body (*not* as the >Subject) to speak-freely-request(a)fourmilab.ch > > * * * To unsubscribe from this mailing list, send E-mail containing the word "unsubscribe" in the message body (*not* as the Subject) to speak-freely-request(a)fourmilab.ch -----BEGIN PGP SIGNATURE----- Version: 6.5.8ckt http://www.ipgpp.com/ iQA/AwUBPQHDY3DnKKP6IdMiEQLTyACfSBRs+lR7R249Q+IWzE3nSjgIrDwAoPnX qOJLi95gXvufiwkq04ccm++5 =c9YJ -----END PGP SIGNATURE----- * * * To unsubscribe from this mailing list, send E-mail containing the word "unsubscribe" in the message body (*not* as the Subject) to speak-freely-request(a)fourmilab.ch

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08 Jun '02

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08 Jun '02

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NYT: Jim Bell = Osama bin Laden
by R. A. Hettinga 08 Jun '02

08 Jun '02

http://www.nytimes.com/2002/06/07/opinion/07KRIS.html?pagewanted=print&posi… June 7, 2002 All-American Osamas By NICHOLAS D. KRISTOF KALISPELL, Mont. We Americans have conjured so specific a vision of terrorists - swarthy, glowering Muslims mumbling fanatically about Allah - that we're missing the threat from home-grown nuts, people like David Burgert. Mr. Burgert, a 38-year-old who last made a living renting out snowmobiles here in this spectacularly beautiful nook of northwestern Montana, had a terror plan that made Osama bin Laden's look rinky-dink. Not content merely to kill a few thousand people, Mr. Burgert's nine-member militia was planning a violent revolution and civil war to overthrow the entire United States government. The plan, according to Sheriff James Dupont, was for the militia to use its machine guns, pipe bombs and 30,000 rounds of ammunition to assassinate 26 local officials (including Mr. Dupont), and then wipe out the National Guard when it arrived. After the panicked authorities sent in NATO troops, true American patriots would rise up, a ferocious war would ensue, and the U.S. would end up back in the hands of white Christians. "The good thing is that most of the people who would do it are so stupid that they would kill themselves first," said Sheriff Dupont, who runs the law here in rugged Flathead County, which is bigger than all of Connecticut and has lots more grizzly bears. But the litany of domestic militia plots, failed ones, is still sobering. In Michigan, militia members planned to bomb two federal buildings. Missourians planned to attack American military bases, starting with Fort Hood, Tex., on a day it opened to tens of thousands of visitors. California militia members planned to blow up a propane storage facility. Most unnerving, a Florida militia plotted to destroy a nuclear power plant. If these were Muslims who were forming militias and exchanging tips for making nerve gas, then we'd toss them in prison in an instant. But we're distracted by our own stereotypes, searching for Muslim terrorists in the Philippine jungle and the Detroit suburbs and forgetting that there are blond, blue-eyed mad bombers as well. We're making precisely the mistake that the Saudis did a few years ago: dismissing familiar violent fanatics as kooks. In fact, militia members and Al Qaeda members are remarkably similar. Both are galvanized by religious extremism (America's militias overlap with the Christian Identity movement, which preaches that Jews are the children of Satan and that people of color are sub-human), both see the United States government as utterly evil, and both are empowered by the information revolution that enables them to create networks, recruit disciples and trade recipes for bio- and chemical weapons. It would be a mistake to put one's faith in the militias' eternal incompetence. Jessica Stern of Harvard has written about an anti-government activist named James Dalton Bell, who earned a degree in chemistry from M.I.T. and is unquestionably brilliant. By age 14, he says, "I was studying the isomerization of benzyl thiocyanate to the isocyanate." Weren't we all? But Mr. Bell, who is now in jail, is also believed by the authorities to have manufactured sarin, a nerve gas, in his basement. He led a chemical attack against an I.R.S. office and wrote an Internet book called "Assassination Politics," which outlines a very clever scheme to pay for contract killings of federal officials with digital cash in a way that preserves anonymity at both ends. There is also evidence that Mr. Bell talked "hypothetically" of poisoning a city's water supply. The things you learn in Montana: According to militia members here, the World Trade Center attacks were a plot by the Feds to declare an emergency and abolish the Bill of Rights; the Columbine school shootings were a federal test of new mind-control technology; a map on a Kix cereal box shows the occupation zones Americans will be herded into after the United Nations takes over. Another thing you learn here is how to deal with grizzlies. Don't be so focused on a distant moose that you ignore the bear behind you. And if it charges, stand your ground until it's 10 feet away, then shoot pepper spray into its eyes, and - very quickly - step aside. Right now, I'm afraid that the Bush administration is so focused on the distant moose that we're oblivious to the local grizzlies like Dave Burgert creeping up on us. Copyright 2002 The New York Times Company | Permissions | Privacy Policy -- ----------------- R. A. Hettinga <mailto: rah(a)ibuc.com> The Internet Bearer Underwriting Corporation <http://www.ibuc.com/> 44 Farquhar Street, Boston, MA 02131 USA "... however it may deserve respect for its usefulness and antiquity, [predicting the end of the world] has not been found agreeable to experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'

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08 Jun '02

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Re: Degrees of Freedom vs. Hollywood Control Freaks
by Major Variola (ret) 07 Jun '02

07 Jun '02

At 01:42 PM 6/6/02 -0700, Tim May wrote: >Someone said something earlier about tube/valve amps giving a boost to >the high end, for older, hearing-damaged rockers. Mr. Elloi wrote first about the fashion for "valve" audio amps and then mentioned that some yahoos listen with Dolby emphesis. I commented that the latter was for the old deaf. This is unrelated to the fashion for valves. I don't think the >frequency response has evern been an issue...tube amps are said to have >a "warmer" sound, and to have more odd harmonic distortion than >transistor amps, but the frequency response of _any_ transistor or tube >amp is vastly beyond what even high-end speakers and headphones can >typically deliver. > >A modern solid state amp is essentially "flat" from 20 Hz to 20 KHz. Yes, in the linear part of their operation. But its the *distortion* (large signal behavior) which differs ---tubes distort differently when "overdriven". I believe the difference when driven with a square wave is that tubes have a more RC-like output function, vs. a sharper (faster slew) transistor reproduction. One little known fact is that humans actually prefer a small amount of distortion in their listening. The THD of amps with a lot of decimal-zeroes, is a good technical spec (easily attainable, cheaply, nowadays), but is totally a marketing scam. First you can't hear the difference between .01 and .001 % THD, and second you prefer ~ .1% Now back to your regularly scheduled decay of civilization..

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by jerry3702g34＠aol.com 07 Jun '02

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07 Jun '02

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Re: More of Ben's blinding
by Anonymous 07 Jun '02

07 Jun '02

Jason Holt writes: > Anybody know of other patents which might get in the way? I'm worried > about Chaum's blind signature and undeniable signature patents, and want to > present as patent-free a system as possible. There was extensive discussion on coderpunks about possible patent implications of Wagner blinding. Using the g^b blinding makes things potentially a little worse, because it requires the server to publish g and g^k. This can be considered a public key, and brings the situation closer to the blind signature patent. Wagner blinding can be thought of as a blinded undeniable signature. It is like a blind signature in that the server doesn't see what it is "signing". And it is like an undeniable signature in that the validity can only be checked with the aid of the server. It seems likely that Wagner could have patented his blinding along these lines if he had wanted to. So the problem is, if this is a blind + undeniable signature, doesn't that suggest that it infringes on both the blind and the undeniable signature patents? To answer this you have to look at the claims in detail. You can differentiate from the undeniable signature patent in that there is no repudiation protocol in the ecash system - no way for the server to prove that a purportedly signed value is actually bad. (Of course this lack is a weakness in an ecash system, since the bank might like to be able to prove that bogus cash is just that; but if it were remedied then Wagner blinding would almost certainly infringe the undeniable signature patent.) Differentiation from the blind signature patent is done simply by asserting that this is not a signature. That's why we are always careful to put "sign" into quotes when referring to server operations. It's not a signature because there is no way to independently verify it, which one can argue is a de facto requirement for something to be considered a signature. But of course, by this definition the undeniable signature is not a signature either. Yet we call it a kind of signature. If the undeniable signature is a signature, then so is the Wagner blinding, and so it is covered by the blind signature patent. As you can see, the situation is murky. One salvation is that the blind signature patent will expire in about 3 years, and it is unlikely that you will be successful enough in any project that it would be worthwhile to sue you within that time frame. Besides, everyone who takes control of the blind sig patent soon goes broke, so they probably can't afford a lawyer to sue you anyway. You should be aware too that there are a number of credential patents, which you can find by searching on the word credential. > One more thing. If the issuer returns the signature: > > (h1*g^b1 *h2*g^b2 *h3*g^b3...)^k > > Can I separate out any of the h^k values? My system relies on that > being hard. Seems safe by the DDH assumption, which is that it is hard to recognize that (g, g^a, g^b, g^ab) have the DH relationship. If we let m = g^b then this is (g, g^a, m, m^a). In other words, we can't tell whether two different values g and m are both being raised to the same power. In your case, you know h1, h2, (h1h2)^k. If you could then find h1^k, you could construct a DDH tuple (h1, h1^k, h1h2, (h1h2)^k), so you could violate the DDH assumption. This is a little hand-wavy and only deals with the two element case, but an argument along these lines will probably work. > If I replace h1 with (g^b0) and get the issuer to sign: > > ((g^b0)*g^b1 *h2*g^b2 *h3*g^b3...)^k > > I should be able to divide the two results and get h1^k. But part of > the cut-and-choose protocol will be to require that the n/2 checked documents > are all valid and different from any previous instances of the protocol. So > it should be extremely hard for the user to sneak lots of previously used > values and fake h's (which are really blinding factors) into the unrevealed > documents. But are there other ways to separate out signatures on individual > h's? You're really going to remember all the discarded h values from all the previous instances of credential issuing? Seems like it might be a lot of data. How many h values do you typically expect? Maybe you could say more about the details of your credential system. Such a system built on Wagner blinding might be very interesting.

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number of bits in bent funtion
by Sandy Harris 07 Jun '02

07 Jun '02

Is there a general rule for the number of set bits in a bent boolean function of n input bits? I know from the Mister and Adams paper at SAC 96: http://adonis.ee.queensu.ca:8000/sac/sac96/papers.html that any 8-bit bent function has either 120 or 136 bits set. That's (2^8)/2 +- 8. Does that generalise to (2^n)/2 +- n for any even n? Or is there some other general rule?

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