December 2003 - cypherpunks-legacy

Re: Signing video... (fwd)
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > Date: Mon, 26 Jan 1998 19:43:17 -0800 > From: Steve Schear <schear(a)lvdi.net> > Subject: Re: Signing video... > >I was exchangin idea with a couple of members off-list and an idea came to > >me about how to time stamp the frames. It would require a minor modification > >to the WWV transmission but it wouldn't be much. Have the WWV transmitters > >sign each 'tick' of the clock and have a WWV receiver in the vcr. This would > >allow time stamping the frame with a signed reference that could be checked. > > Although this could reduce the cost and power consumption in the camera how > does this guarantee that the signature information wasn't inserted later. > With today's excellent digital postprocessing it could be very hard to > detect. The fact that it's hard is what makes it worth doing in some environments. The goal is to provide a reasonable doubt as to the validity of the picture on the tape. Don't know about cost and power consumption...but this is where I'm at on this issue now, by no means is it fully worked out: The actual signal on the tape can be mapped to a specific head mechanism using the same sorts of technology that is used to identify specific cell phones from the rf signature. So we can do an analysis of the signal and verify if a given camera striped the tape. Hysterisis, amplifier slew rates, power spectrum analysis, etc. The pattern of wow and flutter of any motor and drive mechanism is unique and can also be mapped to a specific mechanism. This wow and flutter creates regular and repeatable irregularities in the pattern on the tape. This allows us to match a drive mechanism to a specific program on a tape. Irregularities in the drive wheel will cause specific pattern in the way the stripes are laid down (ie wiggles in the same place each time that part of the wheel comes around). Irregularities in the syncronizing clocks in the tape mechanism can be traced to particular oscillators (usualy slew rate as a function of frequency stability). By signing the frames with a signed time reference we can verify which clock was used, though we can't verify that it wasn't recorded and played back at a later time. We can at least verify the tape wasn't stiped prior to the claimed time. For security applications this could be quite useful. So if we have a fully analog system there are several means to test the various parts of the systems to verify source veracity. We can also test the tape recording mechanism even on a digital or hybrid system. So let's look at hybrid systems where the video signal is source digital or is digitized in the camera (for special effects, etc.). If a frame isn't signed we don't trust it. So we have a camera with a ROM that has a signature. We could replace the code in the rom and keep the signature. If the owner doesn't replace the ROM prior to testing then we can easily verify the ROM and it's signature don't match. We don't even need the signature to do this, simple comparison between the rom that should be there versus the one that is present is enough. If they do replace the ROM then we have a frame that is signed but potentialy modified prior to the d/a conversion process. The question is can we in fact identify such non-linear editing? If the answer is no then there is a clear reason to suspect the validity of any video source that went through any sort of digital processing. I suspect the answer is no since this question is equivalent to signing a document that was modified prior to the signature being placed on it. The signature process only signs what was fed into the algorithm and can't detect changes to the document prior to the signing. ____________________________________________________________________ | | | 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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Organic Chemistry Lab Safety
by Jim Choate 17 Dec '03

17 Dec '03

Hi, The question was asked why mixing acids and bases are hazardous. Please note number 5 below. When an acid and base are mixed you get water and a salt. When water is added to acid (ie pouring a base into an acid) the heat of reaction can cause the water to get quite hot and cause the chemicals to splatter upon you. The idea is you want the acid to disolve in the water and not the other way around. Goggles, bibs, and all other reasonable safety precautions should always be used. Forwarded message: > X-within-URL: http://www.ems.uwplatt.edu/sci/chem/saf/safetyor.htm > ORGANIC CHEMISTRY LABORATORY SAFETY RULES > > * 1. Maintain a business-like attitude. Be prepared! Do not attempt > unauthorized experiments. > * 2. Wear safety goggles (eye protection) at all times when in the > laboratory. This is a departmental and state regulation. Do not > eat or drink in the lab or bring food or drink into the lab. > * 3. Know the location and use of the nearest fire extinguisher, > nearest First Aid kit, nearest eye wash station, nearest safety > shower, and nearest exit designated for evacuation. Know the > location of the Material Safety Data Sheets (MSDS) and know that > you have access to them. Know the NFPA (National Fire Protection > Association) Hazardous Material Classification Codes. > * 4. Report any accident, even minor injuries, to the instructor at > once. > * 5. When diluting acids, pour acid slowly and carefully into the > water with constant stirring. Use Pyrex and Kimax glassware and > NEVER add water to acid. Rinse acid or base Penny-Head stoppered > bottles under the faucet after each use. > * > 6. In the event that acid, base, or any corrosive liquid is spilled on > your person: > a) Flush immediately with running water at the sink. Call for > instructor. > b) Rinse area with 5% sodium bicarbonate solution. > c) Wash area with soap and water, blot dry with clean towel or > handkerchief. > d) Follow direction of lab supervisor. Check MSDS if you have > questions. > * 7. In case of an organic chemical spilled on your person, flush > with water, wash with soap, rinse with water, rinse with ethyl > alcohol, wash with soap, and rinse with water. Pat dry. Wash hands > before and after visiting toilet. Check MSDS if you have > questions. > * 8. Never taste chemicals or solutions. Minimize the inhalation of > organic vapors by using the smallest amounts of materials and > utilizing the hood as much as possible. Check MSDS if you have > questions. > * 9. Many organic compounds are either carcinogenic, mutagenic, > and/or teratogenic. Generally avoid aromatic amines and nitroso > compounds. Review the document on Chemical Exposure in Organic > Chemistry. Check the MSDS if you are not adequately aware of the > compound's properties. > * 10. In case of cuts or punctures, flush with running water, and > call for instructor or see stock room attendant on third floor for > First Aid. All punctures should be seen by the university nurse or > a physician! > * 11. Dispose of all wastes properly. Read labels on bottles! Keep > bench and floor clean. > * 12. Before leaving the laboratory, be sure that the water, steam, > heaters, and gas cocks are shut off. > > | Chemistry Home | UW-Madison Safety | sundin(a)uwplatt.edu | > > > Document Last Modified: August 26, 1997 > Copyright © 1998, University of Wisconsin - Platteville > ____________________________________________________________________ | | | 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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Computer makers speed up Internet [CNN]
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > COMPUTER, PHONE COMPANIES SEEK TO SPEED INTERNET > > graphic January 26, 1998 > Web posted at: 9:46 p.m. EST (0246 GMT) > > WASHINGTON (CNN) -- Top computer firms Compaq, Intel and Microsoft > and leading telephone and networking companies Monday announced an > alliance to promote high-speed Internet links over ordinary phone > lines. > > Telephone companies banded together and sought support from the > high-tech giants to ward off a competing scheme for faster Internet > connections relying on cable television wires. > > The phone group said it will offer the International > Telecommunications Union, which sets industry standards, a uniform > method of connecting to the Internet using "asymmetric digital > subscriber line" technology, or ADSL. Equipment makers plan to offer > products based on the standard. ____________________________________________________________________ | | | 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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Intel drops prices [CNN]
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > Company cuts price tag of older models > by up to 51 percent > > January 26, 1998: 9:14 p.m. ET > > > Intel > More related sites... SAN FRANCISCO (Reuters) - Semiconductor giant > Intel Corp. Monday unveiled its fastest version of the Pentium II > processor for desktop computers, servers and workstations and cut > prices on older chips by up to 51 percent. > [INLINE] Several major PC makers introduced new PCs, servers and > workstations around the new Pentium II chip, which runs at 333 > megahertz, and is priced at $721 each, in units of 1,000. > [INLINE] Hewlett-Packard Co., Packard Bell NEC Inc. and Gateway 2000 > Inc. unveiled new computers using the 333-megahertz processor on > Monday, some with prices starting at around $2,800. [text deleted] ____________________________________________________________________ | | | 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: Announcement: RPK InvisiMail released on 12 Jan, 1998
by Bill Stewart 17 Dec '03

17 Dec '03

Thanks for an interesting perspective on working with NZ's export bureaucrats. At 04:59 PM 1/26/98 -0800, Jack Oswald <joswald(a)rpkusa.com> wrote: >Bill - The technology that we export as part of RPK InvisiMail, is >world-class strong crypto. Key size options are 607 bits and 1279. The >math behind the system is based on the same as that of D-H. There is no >snake oil. There was no intentional or unintentional attempt to mislead >any government authority. We also did not request an export license, >because there is no need to do so in New Zealand as long as the export is >by means of the Internet. Peter G. knows this as well. The story may be >different for physical export on disk, disc or tape, although we cannot >concur with Peter's personal experience. Our experience is that we get >pretty good treatment from the NZ authorities. We also may use a different >approach. I have often heard that you can often get a better response when >using honey than vinegar. Therein may explain differences in our Thanks! Bill Bill Stewart, bill.stewart(a)pobox.com PGP Fingerprint D454 E202 CBC8 40BF 3C85 B884 0ABE 4639

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Re: Response to ticket 012398-6918-403
by kozmo killah 17 Dec '03

17 Dec '03

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Just a Reminder...
by mall＠daltek.net 17 Dec '03

17 Dec '03

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ULotD? Cuban Tattoos.
by Robert Hettinga 17 Dec '03

17 Dec '03

A bit o'apocrypha for a Monday evening... Cheers, Bob --- begin forwarded text Resent-Date: Tue, 27 Jan 1998 11:27:25 -0500 X-Authentication-Warning: qnx.com: localhost [127.0.0.1] didn't use HELO protocol To: 0xdeadbeef(a)substance.abuse.blackdown.org Cc: bostic(a)bsdi.com Subject: ULotD? Cuban Tattoos. Date: Tue, 27 Jan 1998 10:14:12 -0500 From: glen mccready <glen(a)qnx.com> Resent-From: 0xdeadbeef(a)substance.abuse.blackdown.org X-Mailing-List: <0xdeadbeef(a)substance.abuse.blackdown.org> archive/latest/2668 X-Loop: 0xdeadbeef(a)substance.abuse.blackdown.org Precedence: list Resent-Sender: 0xdeadbeef-request(a)substance.abuse.blackdown.org Forwarded-by: Arunas Norvaisa <arunas(a)witty.com> There was a guy in Florida, Cuban by nationality, who had been unable to get US citizenship and was due to be deported. A couple of MIT students, who had heard about this guy and were after a lark, hopped a plane down to Florida and took this guy to a tatoo studio. What they tatooed on to him was the DES algorithm, in some computer readable form. Thus rendering the guy unexportable. The US government offered to scrape the tatoos off, but they guy's lawyers screamed something about human rights abuses. The way I heard it, the guy was eventually granted citizenship. --- end forwarded text ----------------- Robert Hettinga (rah(a)shipwright.com) Philodox e$, 44 Farquhar Street, Boston, MA 02131 USA "... however it may deserve respect for its usefulness and antiquity, [predicting the end of the world] has not been found agreeable to experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire' The e$ Home Page: http://www.shipwright.com/ Ask me about FC98 in Anguilla!: <http://www.fc98.ai/>

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by eureka＠eureka.abc-web.com 17 Dec '03

17 Dec '03

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Re: Physical Meet: Feb. 21 (fwd)
by Jim Choate 17 Dec '03

17 Dec '03

Forwarded message: > Date: Tue, 27 Jan 1998 11:28:34 -0600 > From: "Troy A. Bollinger" <troy(a)austin.ibm.com> > Subject: Re: Physical Meet: Feb. 21 > Quoting Jim Choate (ravage(a)ssz.com) > > > > Ok, looks like the magic day is Saturday Feb. 21, 1998 from 6-7pm. > > > > So, now all we need is a place... > > > > Flipnotics worked last time. > > I'd like to suggest that everyone bring a printout of their PGP > fingerprint so we can sign each other's keys. I think I can make this one. I don't have any interest in signing or being signed however, thanks for the offer. ____________________________________________________________________ | | | 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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