- cypherpunks-legacy - lists.cpunks.org

Magic money
by Eric Wilhem 17 Dec '03

17 Dec '03

Is the guy still around who wrote " Magic Money" and if so where can I communicate with him? Apparently his name is "Product Cypher". Thanks, Eric Wilhem

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info
by Stefan D. Wolf 17 Dec '03

17 Dec '03

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Re: Encyrption Program
by semprini＠theschool.com 17 Dec '03

17 Dec '03

This is in response to the several posts regarding the assumed weakness in the program I wrote: While it is true that PRNG's are not very good, because of the inherent lattice structure, I believe I found a way around that problem. To work around the lattice problem, I used a systm of cubic arrays. The program first creates sixteen cubic arrays, and fills them one space at a time with random characters. When the stream of characters to be XORed with the plaintext is generated, it picks a random cube and a random location with that cube. The resulting "random" character is then XORed with the appropriate character of the plaintext. If someone can prove to me that this method is stupid or easily breakable, I would actually be happy. So, those of you bent on proving that I'm wrong, I heartily encourage you to do so. As I mentioned before, you can download both the compiled version *and* the source at "http://www.brigadoon.com/~semprini/3dmx". If you are having trouble reaching that site, e-mail me and I will send you a copy via e-mail. Thank you for your interest and criticisms. They have been helpful. --Dylan

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CDL is here!! (fwd)
by Japhy Ryder 17 Dec '03

17 Dec '03

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Hi from the Girls...... (fwd)
by Japhy Ryder 17 Dec '03

17 Dec '03

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Cyber Promotions Selling Off Its Own Mailing List (fwd)
by Japhy Ryder 17 Dec '03

17 Dec '03

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by Japhy Ryder 17 Dec '03

17 Dec '03

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Re: PGP CAKware & IETF controlled Open-PGP standard
by Omegaman 17 Dec '03

17 Dec '03

Adam Back writes: > Jonathan Seybold <jseybold(a)pgp.com> writes: > > Adam, one aspect of your suggestion puzzles me: > > One thing which concerns me most is KNOWING when a message I send > > (or receive) could be read by someone else. The PGP CMR scheme makes this > > very clear: if there is an extra CMR key, the message may be read by > > whomever controls that key, if not, only the recipient may decrypt the > > message. > > If, however, the message is secretly re-encrypted to a corporate > > storage key AFTER it is received, I will never know that. > > You will if you mark the key with this information. This is a straw man anyway. You don't know this now. Someone you are communicating with could already be forwarding plaintext to a third party unbeknownst to the sender. This is a "do you trust the recipient" issue. > What I _am_ arguing is that in designing systems to provide companies > with data recovery mechanisms that you should a) not weaken security > more than necessary, and b) that it would be nice if you used a method > which doesn't introduce GAK compliancy for communications keys. > > I presented I think in plenty of detail an alternate mechanism which > is both non-GAK compliant, and more secure. So what is the problem? > Is there a technical flaw in my solution? No. But there is in their's(PGP Inc.) as I think you and others have amply demonstrated. The technical issues alone are enough to reject usage of PGP5.5's CMR features. It intrigues me that there has been virtual silence from PGP employees on the technical issues. Only Hal Finney via the IETF-Open-PGP has come anywhere near commenting upon this. I haven't seen anyone from PGP Inc. comment on your data-recovery implementation ideas. In my optimistic moments, I take this as a sign that internally, PGP inc. is giving consideration to producting more sensible and effective solutions. (Maybe even as outlined here) > > This means, I believe, that they should NEVER INVOLVE HIDDEN BACK > > DOORS THAT USERS ARE NOT AWARE OF. > > Agreed. You can flag backdoors with either solution. See above. The prescence of flags does not prevent this. By definition I might add ;). Trust issues, etc. are involved. > It works well enough, but it could be made much more secure, by > separating storage key functionality from transient message key > functionality. This would also give you the chance to resolve the > articificially created need for GAK compliancy, which arises because > you are being forced by this lack of distinction between key > functionalities to use one key for both long term storage and what > should be transient communications key usage. Hal Finney's description of key sttributes indicate that implementing separate storage keys would not be hard for PGP Inc to implement in the next release. > Decentralised control is good, of course, but the pgp5.5 and SMTP > policy enforcer is a ready to roll GAK system. Of course, other companies could have (and will) implement similar systems. That PGP, with it's reputation and stated policies, would is surprising. Hopefully, PGP will live up to their reputation by realizing this misstep and correcting it with a more secure, less GAK-compliant implementation. > The PGP bashing PGP observes is an attempt by the pro-privacy crypto > community to influence PGP to re-think the GAK compliancy, and to > point out the more secure way to implement corporate recovery of > stored email messages without GAK compliancy. > > I reserve the right to bash any company which attempts to field GAK > compliant software. The "bashing" in this notoriously harsh forum has been rather tender in my view. Perhaps the perception of "bashing" is based on recognition (and guilt) that the CMR mechanism is flawed and goes against "the spirit of PGP." Methinks, y'all doth protest too much. -- --------------------------------------------------------------------- Omegaman <mailto:omegam@cmq.com>|"When they kick out your front door, PGP Key fingerprint = | How are you gonna come? 6D 31 C3 00 77 8C D1 C2 | With your hands upon your head, 59 0A 01 E3 AF 81 94 63 | Or on the trigger of your gun?" Send email with "get key" as the| -- The Clash, "Guns of Brixton" "Subject:"to get my public key | _London_Calling_ , 1980 ---------------------------------------------------------------------

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New Mailing List: Terrorism
by John Gilmore 17 Dec '03

17 Dec '03

Sounds like some "civil rights oriented" EMS, fire, law enforcement, intelligence community, etc people should join, and let the rest of us know what they are doing... John From: churton.budd(a)mediccom.org (Churton Budd) Date: Sat, 11 Oct 1997 10:55:40 GMT TERRORISM --------- TERRORISM is intended for discussion about terrorism response and prevention, including intelligence gathering and emergency responses. Topics include weapons of mass destruction, suspicious activities, educational and funding opportunities, politics, and response ideas. TERRORISM is an open forum to EMS, fire, law enforcement, intelligence community, disaster preparedness & response, and military personnel with an interest in preventing and responding to terrorist incidents. Announcements about new educational opportunities and grants are welcome, as are new products, services, or technologies directly related to terrorism response. Listname: terrorism Post to: terrorism(a)mediccom.org subscription command: subscribe terrorism sent to: listserv(a)mediccom.org

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why Phil Zimmermann should be speaking out against pgp5.5 and CMR
by Adam Back 17 Dec '03

17 Dec '03

(Readers may notice PRZ's email address on the Cc line, this is an open letter addressed to him). In the debate on the controversial pgp5.5 commerical message recover (CMR) system, I noticed someone made the comment that they couldn't see what the big deal is with enforced multiple crypto recipients who aren't also message recipients, as pgp2.x has had non-enforced multiple crypto recipients for ages. I will put the case for why this practice should be avoided for security reasons. I would like to also put the case of why the enforced multiple crypto recipient construct should be avoided in building messaging systems where the designers would like to avoid building GAK compliant systems. The security reasoning is simple: there are is an extra door into the encrypted data: via the CMR key. Introducing an extra door reduces security, because there are now two keys which could be compromised to gain access to the data. That was simple. Possibly not that major a problem, perhaps both keys are so well secured that the additional leakage is academic. In that case, fair enough. Now the GAK compliant case: Firstly it is important to understand the subtle but very significant difference between enforced crypto recipients who aren't message recipients and normal pgp2.x style multiple crypto recipients. This difference is as much to do with the way that mail clients and plugins have used the pgp2.x multiple crypto recipients in fielded systems as with the actual messaging packet differences. A message recipient is someone who's email address is listed in a To: Cc: or Bcc: field in your mail client. A crypto recipient is someone who will be able to decrypt the message. Pgp is a hybrid crypto system, a message consists of the email encrypted with a randomly generated symmetric key, the session key. The session key is in turn encrypted to the public key of the recipient, these are called Public Key Encrypted (PKE) packets. To implement multiple crypto recipients pgp simply tacks on as many PKE packets as there are crypto recipients; each PKE packet being the session key encrypted to the public key of one of the crypto recipients. Now in most fielded PGP email plugins, and clients which take notice of Cc: and Bcc: fields, the number of crypto recipients ties directly with the number of message recipients. This makes it difficult therefore for the existing systems to automate encryption to a third party without software modifications. If a company which is hoping to become a market leader (a hint PGP) were to retain this functionality, GAKkers would find it difficult to use this software to effectively impose GAK. Sure you can Cc: your message to the NSA key. This would be voluntary GAK. Carl Ellison and a number of others suggested this whimsically years back. As in "What's all the fuss about voluntary key escrow, I'll implement voluntary key escrow for you right now, get DIRNSA to generate a key, and I'll sign it, and put it on the keyservers -- end of problem". Carl Ellison had a very good point. The government doesn't want voluntary key escrow, they want as some suspected all along mandatory key escrow, they want GAK (the GAK term is coincidentally another Carl Ellison meme). The reason this is voluntary GAK is that the user in most mail systems would have to go to some concious effort to do this, and may forget some of the time. (It's difficult to make "forgetting" a 5 year jailable offense). Now I'm well aware that some email clients, and MTAs will no doubt allow you to forward copies of all your email transparently to another party. (Please don't flood us with replies describing such functionality). But this is not really the point; it doesn't matter if you can forward copies of your encrypted email "thoughtpolice(a)nsa.gov" -- they can't decrypt it with out the recipients key. Now we come to the danger of PGP Inc's CMR mechanism. CMR breaks this traditional premise that the crypto recipients correspond one-to-one with the message recipients. What it allows is instructions to be given in a public key that tell the software to encrypt messages intended for the owner of this key to two message recipients. This means that for example: If Phil Zimmermann is using his own companies pgp5.0 mail client (and I presume he is), that if the US Government were to pass a law requiring everyone to generate new CMR keys that he would be able to comply without changing his software. This is why I would argue that even pgp5.0 is GAK compliant, it knows how to understand CMR public keys. (I am not actually sure if the pgp5.0 mail client can generate CMR public keys, but the pgp5.5 one can for sure, I'd welcome clarification on this point). The new mandatory GAK law would mean that if he didn't generate a CMR key he would go to jail. So he complies. The terms of the law dictate that the CMR recipeint in individual's mail clients must be "thoughtpolice(a)nsa.gov". Now the next time one of PRZ's favourite resistance groups that he likes to tell us stories about send him an email thanking him for the useful piece of software he provided them with, the USG can listen in because the pgp5.0 software which the resistance fighters have presumably also upgraded to will understand PRZ's CMR key. The USG will if it suits their purposes sell this information to the government in the originating country, and they will have the death squads go kill the resistance fighters if they can determine their identities from the leaked message. This kind of makes a mockery of what PRZ and the PGP brand stands for. Now the pgp 5.5 defenders at PGP Inc will jump up at this point and tell us that this is not so because pgp 5.0 has ability to strip out the second enforced recipient. Well it does. However, PGP Inc has come up with another related clever innovation: their SMTP policy enforcer. This ensures that when resistance fighters attempt to send PRZ email inside the PGP Inc offices (where they will be presumably field testing their GAKware software suite), that if they do take off the CMR recipient, that their mail will bounce. So not being technical crypto gurus, they will try not taking it off next time and the NSA will read the mail again, resulting in the resitance fighters death. Or perhaps alternatively if they really did want to send him email for an important reason, like perhaps to warn him that the corrupt government they were fighting against was going to introduce a law of mandating the use of pgp5.5 by all ISPs and individuals, they would have no way to reach him. This would suit PRZ quite well, because he probably wouldn't want to hear that. Actually it is possibly not fair to pick on PRZ, as I consider it somewhat likely than PRZ is dragging his feet internally to PGP, but is powerless to stop the corporate mindset now at the helm. And if so I apologise for making points at his expense. But also it is important that if PRZ is against this move, that he speak up. That act would have major significance in altering PGP Incs mind. It might also result in a parting of the ways, but I understand from attenders at a physical cypherpunks meeting in the US that PRZ when quizzed about PGP Inc corporate mentality meaning the company would eventually sell out to GAK, relayed that he would quit rather than have be associated with this. Adam -- Now officially an EAR violation... Have *you* exported RSA today? --> http://www.dcs.ex.ac.uk/~aba/rsa/ print pack"C*",split/\D+/,`echo "16iII*o\U@{$/=$z;[(pop,pop,unpack"H*",<> )]}\EsMsKsN0[lN*1lK[d2%Sa2/d0<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<J]dsJxp"|dc`

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