Bric Tutkunlarina ve Ogrenmek Isteyenlere Mujde !!
Title: Anadolu Briç Klubü BRIÇ TUTKUNLARINA VE ÖGRENMEK ISTEYENLERE MÜJDE !! Briç tutkunlari yeni bir mekana kavustu: Anadolu Briç Kulübü.Kosuyolu'nda bahçe içindeki 3 katli bir binada faaliyete geçen kulüp her türlü konfora sahip. Son 6 yilin dördünde Istanbul sampiyonlugunu kazanan kulüp baskani Ümit Tarhan nezaretinde genis bir sampiyon hoca kadrosu tarafindan her yastan briç severlere özel dersler verilmektedir. Kulüpte cazip ödüllü günlük ve haftalik turnuvalar düzenlenmektedir. Ayni zamanda briç sporu meraklilari, yurtiçi ve yurtdisi tüm briç aktivitelerine katilabilmekte ve yakindan takip edebilmektedirler. SIK MEKANIMIZ, ZENGIN APERATIF MUTFAGIMIZ VE ÇOK EKONOMIK FIYATLARIMIZLA SADECE BRIÇ TUTKUNLARINA DEGIL, HOSÇA VAKIT GEÇIRMEK ISTEYEN HERKESE HIZMET VERMEKTEYIZ... SAMPIYON HOCALARDAN BRIÇ DERSLERI GÜNLÜK BRIÇ OYUNLARI DILERSENIZ DOSTLARINIZLA, DILERSENIZ SAMPIYON BRIÇ OYUNCULARIYLA YARISMA IMKANI ÖZEL ÖDÜLLÜ TURNUVALAR Adres : Kosuyolu Cad. Mahmut Yesari Sok. No.34, Kadiköy-Istanbul Tel. : 0216 - 327 59 67 0216 - 327 59 75 Fax : 0216 - 327 63 17 Web : www.anadolubric.com [EMAIL PROTECTED] E-mail Listesinden çikmak için « tiklayin« To unsubscribe from this list please click
Re: Auditing Source Code for Backdoors
Bill Franz: look at the IBM research report Thirty years later: lesons from the multics security evaulation paper by Karger Schell. They describe successfully inserting backdoors into an OS. The back doors were distributed (incl. to P-gon) and only discovered a year later. Cheers
Anarchists.Halloween equals war on the police state
...The perception of anarchists has long been of loners who hate government and break laws, an image fueled by protests and arrests here and around the world. Getting arrested for a good cause is a badge of honor, local anarchists say, and they are anti-authoritarian. But, they add, overthrowing capitalism requires organization and cooperation... http://www.infoshop.org/inews/stories.php?story=02/11/05/1953644 Where the Hett where you? An estimated 15,000 protesters converged on Boston Common yesterday for a three-hour rally to demonstrate against a possible US war with Iraq. The turnout, estimated by police, rivaled any Boston peace rally since the Gulf War, organizers said. Halloween Equals War on the Police State posted by Calamity Jayne on Monday November 04 EAST AURORA, NY: Was the cause of the riot a flyer distributed at the high school which read Halloween equals war on the police state? Police used tear gas and pepper spray early Sunday to quell a disturbance that escalated into bottle-throwing and looting during a Halloween party attended by an estimated 65,000 people http://www.infoshop.org/inews/stories.php?story=02/11/03/8092588
Re: patent free(?) anonymous credential system pre-print
Stefan Brands writes regarding http://eprint.iacr.org/2002/151/: The paper shows some promise but, apart from being insecure, has other drawbacks that should be addressed: ... My work... introduced by myself... my MIT press book... In addition to various other drawbacks pointed out by of Dr. Adam Back (see [EMAIL PROTECTED]/msg02752.html), the proposal does not offer a wallet-with-observer mode, discarding protection, anonymous recertification / updating, multi-application certificates, etcetera. And balanced against all these numerous shortcomings, there is one inescapable, overwhelming fact: THE AUTHORS ARE MAKING THE FRUITS OF THEIR LABOR AVAILABLE FREELY FOR THE WORLD TO USE. With all of your patents, and your writings, and your self-promotion, how many people are using your certificates in the real world? Think how much you could have accomplished, how much of a difference you could have made, if you had been willing to sacrifice the hope of great riches. Instead you have followed in the footsteps of your mentor Chaum, and both of you have withheld your talent from the world. What is it about cash and credential systems that everyone who works in the area thinks they should patent their results? All you have accomplished is to make sure that no implementations exist! What good are your great ideas if no one can use them? Look at Chaum! Is that where you want to be in 20 years? Bitter and barren? Cut off from the cryptographic community? Reduced to publishing via the government patent office? That's no life for a great mind. Creativity demands interaction with an active and vital intellectual community. You have to give in order to take. Building walls around your intellectual property shuts others out even as you shut yourself in. If you really want to accomplish something meaningful, rather than continuing to hype and shill for a system which no one can use without entering into delicate financial negotiations, why not make it available on some basis for people to experiment with? Maybe a non-commercial, open-source GPL implementation could be a starting point. There is considerable interest in reputation systems among the P2P community and credentials could be a part of that. You can still protect your commercial interests while letting people get familiar with the technology by making a non-commercial library available. That's just one possibility. The point is, your ideas are going nowhere using your present strategy. Either this technology won't be used at all, or inferior but unrestricted implementations will be explored, as in the recent work. If you want things to happen differently, you must change your strategy.
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[perry@piermont.com: The FBI Has Bugged Our Public Libraries]
This will come as no suprise to people on this list. - Forwarded message from Perry E. Metzger [EMAIL PROTECTED] - Delivered-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: The FBI Has Bugged Our Public Libraries From: Perry E. Metzger [EMAIL PROTECTED] Date: 05 Nov 2002 18:40:31 -0500 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 Precedence: bulk From Interesting-People Date: Tue, 05 Nov 2002 17:12:52 -0500 Subject: [IP] The FBI Has Bugged Our Public Libraries From: Dave Farber [EMAIL PROTECTED] From: Richard Forno [EMAIL PROTECTED] Subject: The FBI Has Bugged Our Public Libraries To: Dave Farber [EMAIL PROTECTED] Date: Tue, 05 Nov 2002 16:40:41 -0500 The FBI Has Bugged Our Public Libraries November 3, 2002 http://www.ctnow.com/features/lifestyle/hc-privacy1103.artnov03col.story Some reports say the FBI is snooping in the libraries. Is that really happening? Yes. I have uncovered information that persuades me that the Federal Bureau of Investigation has bugged the computers at the Hartford Public Library. And it's probable that other libraries around the state have also been bugged. It's an effort by the FBI to obtain leads that it believes may lead them to terrorists. Many members of the public regularly use computers in libraries to access the Internet for research purposes or to locate information about particular interests. It's also not uncommon for students and others to communicate with friends and relatives through e-mail from there. The FBI system apparently involves the installation of special software on the computers that lets the FBI copy a person's use of the Internet and their e-mail messages. (Don't ask me how I know about this because I can't reveal how I was able to collect the information.) Members of the public who use the library have not been informed that the government is watching their activities. It's not just the computers. Circulation lists that show which books someone borrowed are also accessible to the government. What are the Hartford librarians saying? I can't disclose that we were presented with anything, said Louise Blalock, Hartford's head librarian. I asked Mary W. Billings, the library's technical services manager, if the FBI had given her a subpoena or a court order for library information. Her response: I cannot answer that question. snip http://www.ctnow.com/features/lifestyle/hc-privacy1103.artnov03col.story -- -- Perry E. Metzger[EMAIL PROTECTED] - End forwarded message -
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Re: Cointel is back: meet any new arabic-speaking guys in shiny shoes?
[EMAIL PROTECTED] (Major Variola ret) writes: http://www.washtimes.com/national/20021104-81830128.htm Officials attempt to get inside cells of al Qaeda in U.S. At 11:09 PM 11/04/2002 -0500, Elyn Wollensky wrote: your point would be ;~) If people start showing up at Cypherpunks meetings and paying their dues, get _very_ suspicious :-)
German Wiretappers Bill Victims
http://www.theregister.co.uk/content/5/27917.html German secret service taps phones, bills buggees By Tim Richardson Posted: 04/11/2002 at 14:30 GMT A software error is being blamed for an incident in which mobile phone users discovered they were being bugged by German secret squirrels. According to reports last week, some customers of mobile phone operator O2 noticed an unusual phone number on their bills they didn't recognise and a call charge associated with the number. When they tried to call the number they heard a recorded message telling them they couldn't use the number. After further investigation, though, it was revealed that the number belonged to the German secret service. The number was showing up on people's bills because they were being bugged - and paying for it. Understandably, German police and the secret service were not too chuffed with this. A spokesman for mmO2 blamed the incident on a software error and said it had now been fixed. Only a very small number of individual users were affected, he said. .
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Re: Cointel is back: meet any new arabic-speaking guys in shiny shoes?
At 01:01 PM 11/5/02 -0800, Bill Stewart wrote: If people start showing up at Cypherpunks meetings and paying their dues, get _very_ suspicious :-) Do you take hawala? Chaumian-blinded-hawala? Or just beans, rice, tequila, and ammo?
Re: patent free(?) anonymous credential system pre-print - a simpleattack and other problems
(Re: my paper at http://eprint.iacr.org/2002/151/ ) Stefan Brands wrote: - The system is subject to a simple attack. The problem lies with the multiplication of the hashes. Let's take the Chaum blinding as an [...] (For our readers at home, that was the vulnerability I mentioned in my response to Adam). [...] - My work certainly does provide for revocable anonymity and pooling prevention. For pooling protection, see paragraph 2 on page 193, section 5.11 page 210 paragraph 2, and section 5.5.2 on page 211. For [...] When I speak of pooling credentials, I'm talking about Alice presenting her student ID along with the senior-citizen ID Bob loaned her (or for which Bob is answering clandestine-ly), as if they both belonged to her, in order to get both discounts on her movie tickets. In my system, you get your credentials issued in a set associated with a single identity, and it's hard for Alice to get Bob's credentials included in one of her own sets. It works even if the CAs don't trust each other. Page 211 of your book talks about discouraging lending, which doesn't help in the case when Bob answers in Alice's behalf when she shows his credentials. In any case, section 5.5.2 only adds liability to pooling - it doesn't prevent it mathematically. (As to lending in general, I think you're right that discouragement may be the best we can do). Page 193 and 210 do talk about having an identifying value encoded in the credentials which the holder can prove is or isn't the same as in other credentials. However, the discussion on page 193 is with respect to building digital pseudonyms, and the discussion on page 210 seems to be about showing that values are *not* the same, following a scenario in which a pseudonym holder has been identified as a misbehaver. I can think of ways in which this feature might be leveraged to create otherwise-unlinkable sets of credentials from different (distrusting) CAs, but it's never addressed directly that I can see, and would need some specifics filled in. Nonetheless, I'll point out in my paper that it's a possibility in your system. - The proposed hashing technique for selective disclosure was introduced by myself in 1999. Quoting from page 27 of my MIT Press book titled [...] Pages 27 and 184 of your book are now both referenced in my section on selective disclosure. - More seriously, the simple hash technique has numerous drawbacks, as I explain on page page 27 of my MIT Press book, in the very same paragraph: Although certificate holders now have some control over which attributes they reveal to verifiers, they are forced to leave behind digital signatures. ... [...] What do you mean by forced to leave behind digital signatures? ... Worse, nothing prevents the CA and others from tracing and linking all the communications and transactions of each certificate holder. ... [...] This is of course overcome in my system with blinding and cut-and-choose. [ Snipped discussion of features which Brands' system has and my system doesn't: boolean formulae, lending prevention, limited show, wallet-with-observer, discarding protection, anonymous recertification / updating, multi-application certificates, etc. ] From my response to Adam Back: I'm glad that was clear in my text. This isn't a do-everything system like Brands' - rather, it has 2 aims. 1: show how to do simple selective disclosure in a Chaum/Fiat/Naor-like system using X.509v3 credentials as a base, and 2: show how to link credentials from multiple issuers to the same identity without compromising anonymity. And actually, I forgot to mention the original goal of my paper, which was to create a system not encumbered by your patents or Chaum's. I'll expand my related work section to point out that your system and others have lots of features which my system doesn't attempt to provide. My apologies if my terse treatment mischaracterized your work. -J
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Re: German Wiretappers Bill Victims
On Tue, 5 Nov 2002, Bill Stewart wrote: http://www.theregister.co.uk/content/5/27917.html German secret service taps phones, bills buggees Tapping is made on a very wide scale here. IIRC another article mentioned 200 k phones tapped, though not gave the time period.
Re: patent free(?) anonymous credential system pre-print
(Re: my paper at http://eprint.iacr.org/2002/151/ ) Let me first point out that Dr. Stefan Brands noted an insecurity in my system which would allow malicious users to obtain issuer signatures on arbitrary documents. This is due to the fact that users aren't prevented from using the (bitwise) same document for each element but one in the cut and choose protocol and making the remaining document malicious. If the malicious document isn't selected for inspection, dividing out the signatures on the (n/2)-1 identical documents is trivial, leaving a signature on the malicious value. The credential IDs described in section 4.1 of my paper were designed to thwart this attack, (and the session random values to thwart similar attacks over multiple issuing sessions), and do appear to succeed with the additional requirement that each credential ID be different from the others. This requirement will be added to the next update to the pre-print. This requirement is analogous to the variable i in the preimage of y_i in the Chaum/Fiat/Naor system. It ensures that each candidate is different, and therefore that the values of the elements signed will be unpredictable. On Thu, 31 Oct 2002, Adam Back wrote: Some comments on this paper comparing efficiency, and functionality with Camenisch, Chaum, Brands. Thanks for your feedback! [...] - efficiency The non-interactive cut and choose protocol results in quite big messages in the issuing and showing protcols to attain good security. [...] ... a single credential would be order of 10KB. Similar for the showing protocol. Indeed, as section 6 points out, a set of 3 credentials could be a megabyte in size and require half a megabyte of network traffic. Efficiency is /not/ a major selling point of this system. :) [...] - functionality [pulling up from later on in Adam's post] Most of these short-falls stem from the analogous short-falls in the Wagner blinding method they are based on. Of course (and the point of the paper) the credentials do offer over the base Wagner credentials (a restrictive) form of selective disclosure which the base credentials do not. I'm glad that was clear in my text. This isn't a do-everything system like Brands' - rather, it has 2 aims. 1: show how to do simple selective disclosure in a Chaum/Fiat/Naor-like system using X.509v3 credentials as a base, and 2: show how to link credentials from multiple issuers to the same identity without compromising anonymity. The feature comparison is appreciated, though; it may be useful for an expansion of the related work section, and in terms of features to add in the future. [...] The credentials can be replayed (as there is no credential private key, a trace of a credential show offers no defense against replay). Brands credentials have a private key so they can defend against this. (Chaum's credentials have the same problem). Section 4.3 specifies that Alice should create a keypair and store the public key as a selective disclosure field, allowing her to prove ownership as you describe. The credentials unavoidably leave the verifier with a transferable signed trace of the transaction. Brands credentials offer a zero-knowledge option where the verifier can not transfer any information about what he was shown. Good point. The credentials support selective disclosure of attributes, but only in a restricted sense. Attributes can be disclosed with AND connectives. However other connectives (OR, +, -, negation, and formulae) are not directly possible. Brands supports all of these. Also true. I point this out in paragraphs 1 and 2 of section 2. The credentials do not support lending deterence (there is no option to have a secret associated with a credential that must necessarily be revealed to lend the credential as with Brands). This could be added to my system. To be honest, I don't consider Brands' implementation of lending deterrence to be a worthwhile feature. Having embarassing information in a credential could be a deterrence against lending to an untrusted party, but comes at the cost of an equal liability if the credential is stolen. It also doesn't prevent the rightful holder from providing the response to the challenge on that field when the lendee uses the credential (in real time). Lending is a problem which I don't believe can be solved purely mathematically (which Brands also points out, as I recall). Thus I prefer to avoid the topic rather than give it unavoidably insufficient treatment. The credentials are not suitable for offline use because they offer no possibility for a secret (such as user identity, account number etc) to be revealed if the user spends more times than allowed. My credentials aren't designed to do limited-show, although I do point out in section 4.4.1 that credentials should be used only one
