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Signed document - a thought... (fwd)
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > From: Jim Choate <ravage(a)ssz.com> > Subject: Signed document - a thought... > Date: Sun, 18 Jan 1998 10:31:36 -0600 (CST) > document have a signature key and always submit the signed document prior > to the signing key. After all it's the document and not the author (who we > assume is already using an anonymous submission mechanism) we wish to verify > from the end users perspective. One other assumption that I left out after I sent it was that the data haven and the key server are not the same machine. Sorry, I hope it makes a tad more sense with that proviso included. Sorry for sending an incomplete suggestion. ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage(a)ssz.com | | 512-451-7087 | |____________________________________________________________________|

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17 Dec '03

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Voice Coding Controls
by John Young 17 Dec '03

17 Dec '03

DM notes of the BXA Wassenaar rule for voice coding: After looking at some of the Wassenaar docs, I was surprised to see that the CCL wants to regulate speech encoders that operate at less than 2400 bps. Surprising because it was encoding, not encryption, that was being regulated. This is disturbing. This at first seemed to put some of the Nautilus development team's software in jeopardy, but I believe that by the letter of the law (or regulation) that all coders in Nautilus are not subject to the CCL, as they only go as low as 2400 bps and not less than. For citations of voice coding in Category 5 - Telecommunications: http://jya.com/bxa-wa-cat5.htm#5A001b10 http://jya.com/bxa-wa-cat5.htm#5A991b6a

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Re: CAD Stego (fwd)
by John Young 17 Dec '03

17 Dec '03

Jim Choate wrote: >This suggestion is unworkable in application. Why the focus on color, the easiest thing to avoid using, or layers, ditto? Superfluous for serious CAD, these dainty decorations from Martha Stewartville. Most messages could be concealed in "hatched" objects, bit-bloated as they are, indistinguishable from the elements used to hatch. All black and white; maybe a dot of red for cashmere dupe. In fact, CAD is so bloated with dumb cad-jockey features, and sleazebag work-monitoring logs, it puts most ordinary programs (even air-boss MS) to shame, and could hide a herd of rustled Mex longhorns as easily as the Bush family hides dryhole oil reserves, without any more trickery than sandpapering new boots to look worn. Anyway, Jim, I gather from your remarks that you've not fiddled for endless low-paid months and years to figure out how to cheat the evil bosses and automatic work-snoop feature, while onion-siphoning the Net for horny fare under guise of urgent file transfer to foam-mouth ne'erpays. Underground (so to speak) swapping of digital work avoidance tips is a huge use of global bandwidth riding on the backs of big fat docs for globular structures for maggoty thugs. (Although not nearly as gigantic as the porn trade stego-supporting Net infrastructre growth -- over 50% of Net traffic and rocketing.) Who knows how much illicit info is riding the porn river in and out of the most secure sanctums of tyrants?

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let's do it: NYT ad with hash of fingerprints (fwd)
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > Date: Sun, 18 Jan 1998 23:21:38 GMT > From: Adam Back <aba(a)dcs.ex.ac.uk> > Subject: let's do it: NYT ad with hash of fingerprints > I would have thought you would take out a cheap personals section > advertisement and print one hash output and a URL. The hash ouput > would be the hash of the hashes of a chosen set of public key > fingerprints. This doesn't provide the same sort of protection the original full page ad is supposed to provide. That full page ad will be accessible as a referenc a hundred years from now in just about every library in the country. The link to a webpage won't be. Distinctly different security animals. ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage(a)ssz.com | | 512-451-7087 | |____________________________________________________________________|

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Re: Signed document - a thought... (fwd)
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > Date: Sun, 18 Jan 1998 21:06:28 GMT > From: Adam Back <aba(a)dcs.ex.ac.uk> > Subject: Re: Signed document - a thought... > Sounds like you are describing something which is a variant of an > interlock protocol. The idea of an interlock protocol is that you > send out first a hash of what you are intending to publish. > > The MITM has a problem in deciding what to publish, because they have > to publish _a_ hash, but they don't know what it should be of. Exactly. I hadn't heard of the term 'interlock protocol', thanks for the tip. I'll look into it some more. ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage(a)ssz.com | | 512-451-7087 | |____________________________________________________________________|

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Re: CAD Stego (fwd)
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > Date: Sun, 18 Jan 1998 21:37:28 -0500 > From: John Young <jya(a)pipeline.com> > Subject: Re: CAD Stego (fwd) > Why the focus on color, the easiest thing to avoid using, > or layers, ditto? Superfluous for serious CAD, these > dainty decorations from Martha Stewartville. The reason I addressed them is that they were what you brought up. Those dainty decorations are critical to every industrial use of CAD that I have ever been exposed to or used in an industrial setting. I'll have to disagree with your opinion on their utility. > Most messages could be concealed in "hatched" objects, > bit-bloated as they are, indistinguishable from the elements > used to hatch. All black and white; maybe a dot of red for > cashmere dupe. Ok, let's address hatching from the perspective of use as a means to encrypt data. Let's further use AutoCAD since it is by far the most used in industrial settings. I think you will find that most other CAD programs use one or more of the methods in AutoCAD. AutoCAD offers a standard set of hatching objects via the HATCH and BHATCH commands. In both cases the actual hatch patterns are 1-bit patterns meant to be tiled. The HATCH command itself is normaly used for gross backgrounds and such because it doesn't respect object boundaries. The BHATCH command does respect object boundaries and is used much more in industrial and machine drafting. In both cases the color of both the background and line color must be specified. The hatching pattern is then simply tiled across the appropriate area. It is possible to add other non-standard hatch patterns but again, they are 1-bit deep and tend to be regular so there isn't a lot of room to put data. It is possible to include AutoLisp routines to do such hashing but I fail to see how one would stego encrypted data in source code describing how to draw the pattern. There are two means to store reference to those patterns in a file. The first is simply to include a pointer to a standard table of hash patterns that every copy of the program will understand. I suspect that there isn't much room there for stego. Now if we extend the standard hash table we are required to include those hash patterns in our file and suitable coding to tell the foreign program to include them appropriately. I don't see a lot of room there for stego. The alternate is to include the actual hash pattern in the file specificaly not linked to the hash table, in other words an indpendant object we will manipulate through normal mechanisms. While I will agree that if you could guarantee that Mallet didn't actualy view the file as a graphic but rather as a file via some sort of character editor (eg od -c or od -h as the simplest) there isn't much room for getting caught. However, if you were to bring it up as a graphic and view it you find the actual hash pattern is limited because it can be of only a particular size for the hashing display and handling routines to handle. CAD programs at their basest level understand a limited set of objects; coordinate pairs, sets of such pairs for drawing lines, and color. Other geometric objects (eg circles or hatches) are usualy built up through some sort of algorithmic application of these basic objects. In the better CAD programs those objects are routines that are shared as standard functions in the program or through a cookie-cutter mechanism. The way new functions are added is to add some form of PDL (eg AutoLisp) function. The cookie-cutter mechanism usualy is limited by the 1-bit depth and the limited size of the patterns. Let's look at the mechanism that most CAD and graphics programs use for color manipulation. In very few programs that I have ever come across are the colors of each pixel actualy represented by some depth that allows the full range of colors for every pixel. In general some color map mechanism that takes a limited set of colors (usualy arrayed in a table) and allows the program to select a given color from that table. Such special effects as color cycling are created by writing a program that dynamicaly changes the color stored in each member of that table. This is very fast and allows every pixel for a given color to change in concert instead of the delay of having to go to every pixel and test its color and then change it; very slow. The way that most programs allow more colors than allowed by a given color table is they create some sort of interrupt for each line of the dispaly when the display gets a retrace pulse. When this pulse happens (on a 1024 x 768 it occurs every 1/768 seconds - a long time by computer standards) a routine changes the color map to the one appropriate for that line of the display. Some higher performance displays use a d/a mechanism so that each pixel on the display is addressible. These sorts of displays allow the color map to be changed for each pixel but they are very expensive in hardware and list price, both tend to limit the applicability to commen stego exchange outside a limited group. ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage(a)ssz.com | | 512-451-7087 | |____________________________________________________________________|

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Future War on TDL...
by Jim Choate 17 Dec '03

17 Dec '03

Hi, Check out Futurewar on The Discovery Channel, it's been playing since 8pm Central. Bruce Sterling appears for a blipvert. ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage(a)ssz.com | | 512-451-7087 | |____________________________________________________________________|

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Interlock Protocol
by Jim Choate 17 Dec '03

17 Dec '03

Hi, The Interlock Protocal (Applied Crypto 2nd. ed., pp. 49) is just exactly what I have been looking for to address the MITM issues in regards the data haven model I have been working on. I had completely forgotten about this technique. I should read AC more often...;) Thanks again for the pointer! ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage(a)ssz.com | | 512-451-7087 | |____________________________________________________________________|

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More Software Controls
by John Young 17 Dec '03

17 Dec '03

Denise Caruso reports today in the NYT on upcoming copyright legislation that would prohibit circumventing any copyright protection on digital works. Quote: Many products on the market would qualify for circumvention devices. These include software that allows systems managers to gain access to computers when users lose their passwords and any device used to test the strength of computer security -- products that cannot be tested without trying to break protection technology. There's also a report on The WWW Consortium's vote a few days ago to include the PICS standard for Web infrastructure and the vote's import for censorship. The report notes that technologists are now making decisions about public policy once dominated by lawyers, and defending the self-serving practice much the same: it's for the public good. http://www.nytimes.com

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