- cypherpunks-legacy - lists.cpunks.org

Re: `Sunday Times' article on GSM changes
by pmetzger＠shearson.com 05 Feb '93

05 Feb '93

> From: Brad Huntting <huntting(a)glarp.com> > > It would seem that both the sender and reciever need to be exactly > syncronized to within 1/4 of a bit for this to work. Since voice > data requires about 64Khz Just as a point of information, you can compress voice into 4kbit/sec without any real loss of quality. Perry

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Re: `Sunday Times' article on GSM changes
by crunch＠netcom.com 05 Feb '93

05 Feb '93

Gilmore writes: >Anyone interested in beating him to the net with something that >would compress voice (or voicemail) in realtime on a 486 or a SPARC? I used to build voice scramblers, but mostly in hardware using a Psuedo noise source. It wirked pretty good, but had to compress the bandwidth down to about 2kHz. Thus the reason why it sounds like talking in a tunnel. Has anyone done a feasability study on whether of not a 486 or Sparc station can do this in real time? It would seem to me that Voice mail systems should incorperate this in their system, thus scrambling the messages unless a access code can be used to retrieve it. JD

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RE: 'Sunday Times' article on GSM changes
by crunch＠netcom.com 05 Feb '93

05 Feb '93

>What makes you think they don't have the same kind of REMOB/BLV capability >to the cellular telephone switches? I mean, if a conversation is scrambled >from the mobile phone to the switch over the radio, it must be unscrambled >at the switch before it can be transmitted over the trunk lines into the >PSTN network, and that's where the FBI places their tie-lines and REMOB >units. As far as I know, most cellular interfaces to the BOC system is digital. But I suppose there might be some interface somewhere. I'll put a few "feelers" out and see what I come up with. JD (Scuse line noise..)

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A Bug?
by crunch＠netcom.com 05 Feb '93

05 Feb '93

Don't know if it's something stupid I'm doing, or if there's a bug in the Mac PGP 2.1, but after selecting Text only, and Radix 64 mode, after encrypting the text, I lose all carriage returns after decrypting it. Almost everything I get had no carriage returns in it. I use the Think C editor, or BBEdit for editing my text. Is there an option that permits PGP to retain the carriage returns? JD

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Dear Mr. President
by deltorto＠aol.com 05 Feb '93

05 Feb '93

Here are a few thoughts on the letter we will send to Bill. [A] We should make up a key for the whole group with an insanely long password and all get together and sign it in person. [B] We should send our message to Bill _heavily_ encrypted and as anonymously as possible (I'm talkin' to you remailer studs), and we should send the key under a separate 'envelope.' I suggest that this will definitely get the White House's attention (probably a lot of other people at the No Shit Association too, but hey...). [C] Beyond a congratulatory notes that he has actually bothered to take the Presidency "online," the letter might focus on two main areas: 1. Technology/Privacy: - Privacy and how important it is to the preservation of Democracy. Mentioning the White House email situation to bring it home. - Advancement of technology and how the Government can support us by getting the fuck out of the way and/or providing R&D support (hear, hear, Crunch). I.e let's get those data highways rolling along. - How we feel about the various Intelligence Services of the US Government and how taming them might improve our international reputation. And tell them not to fuck with our mobile phones, etc. Politics: We might also mention how nice it is that he supports Family Values (unlike Bush and rich Cronies), how savvy he is to leave gays in the military alone (unlike most of the GI's I have ever heard of, who mercilessly harrass women), what a good thing it is to house homeless people in unused military barracks and how important it is to send aid to Russia before they come over here and try to live in our unused military barracks, stuff like that. [D] Let's make it a nice letter, full of support, good vibes and humor. We are an interesting group of engineers, artists and creative people and he should be reminded that we are watching him and that he has some support. The guy has a tough job cleaning up all the shit the Bushmen left behind. He deserves some goodwill. [E] ? dave

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RE: 'Sunday Times' article on GSM changes
by thug＠phantom.com 05 Feb '93

05 Feb '93

According to what I read it seems that the whole issue of cellular radio signal encryption is really a non-issue. They could have the most secure standard for radio signal encryption and it wouldn't matter. The FBI already uses tie lines and REMOBs (remote observation units) at the telephone switching centers to access the conversation on any particular local loop (phone number) that they want. I know, because in my younger days as a phone phreak my friends and I used to play with REMOBs and BLV all the time, so I personally know that they exist. What makes you think they don't have the same kind of REMOB/BLV capability to the cellular telephone switches? I mean, if a conversation is scrambled from the mobile phone to the switch over the radio, it must be unscrambled at the switch before it can be transmitted over the trunk lines into the PSTN network, and that's where the FBI places their tie-lines and REMOB units. Like someone else in this thread already mentioned, high-level end-to-end encryption is the only way to protect your privacy. Thug

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RE: White House Replies
by DrZaphod 05 Feb '93

05 Feb '93

The White House writes: > PS: If you did not include your U.S. mail return address in your > message and you want a reply, please send your message again and > include that information. Well this is completely useless, isn't it.. If we imagine this logically we can see masses of e-mail entering the White House while snail mail trickles out... Definately a buffer problem |-]. At least they're trying, I suppose. TTFN! DrZaphod [AC/DC] / [DnA][HP] [drzaphod(a)ncselxsi.uucp] Technicolorized

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Re: White House letter
by DrZaphod 05 Feb '93

05 Feb '93

In Message Thu, 4 Feb 1993 23:22-EST, GS80.SP.CS.CMU.EDU!Marc.Ringuette(a)netcomsv.netcom.com writes: >Dear President Clinton, > Bring democracy to the bits! Let's take a vote among all the bits > to decide which value, 0 or 1, is most correct. Then we can set all > bits to that value and they will all be equal! >Best regards, The Cypherpunks (Socialist Subgroup). > This one soundz a bit like self-rightiousness [sp?] FIND WHAT IS RIGHT AND MAKE EVERYBODY "RIGHT". I think that's what they're [we're?] already doing. >Dear President Clinton, > Freedom for the bits! We will not rest until each bit is free to > determine its own natural orientation without outside coercion. The > good news is, you don't need to do anything at all; merely get out of > the way of the free market, and the bits will free themselves. >Best regards, The Cypherpunks (Anarchist Subgroup). I like this one.. |-] TTFN! DrZaphod [AC/DC] / [DnA][HP] [drzaphod(a)ncselxsi.uucp] Technicolorized

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Re: How to e-mail the White House
by deltorto＠aol.com 05 Feb '93

05 Feb '93

>> The following is NOT a joke. It is a real service being >>provided by President Clinton. If you feel you have something to >>say, send them a letter. I heard they will reply to most messages. >> >> From: The White House <75300.3115(a)compuserve.com> >> >> As you know, this is the first time in history that the >>White House has been connected to the public through electronic mail. >>We welcome your comments and suggestions for ways to improve your >>Public Access E-mail program. Ladies & Gents, I think a group letter would be appropriate from all of us. What an opportunity. I love this country sometimes, y'know? dave PS: Extra special thanks to Mr. Tribble for finding this. Where did you pick it up?

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spread spectrum synchronization
by Phil Karn 05 Feb '93

05 Feb '93

Synchronization is indeed one of the more complex parts of a spread spectrum system. But there are standard, well studied ways to do it, and any of several textbooks have good descriptions. It's more tedious than difficult. A good job for VLSI. The "gold codes" you mention are simply one family of spreading sequences. There are others. You'd search for signals that use them in the same way you'd search for any kind of spreading sequence -- by searching the sequence space until you find a correlation between the incoming signal and your local copy of the spreading sequence. You detect this by the sudden increase in narrowband signal energy seen at the output of the despreader around the nominal carrier frequency when you're within a chip of the correct time. You then lock onto and track the spreading sequence with a circuit very similar to a phase locked loop. Practical spread spectrum systems aid this process either by synchronizing the spreading sequence to a common clock source, or by using a small enough spreading sequence to make searching the entire sequence feasible. In our CDMA cellular system, we use both approaches and several ordinary LSFR PN sequences (not Gold codes). There's a "short PN" code (2^15 chips long) common to all cells that can be found by a mobile within a few seconds of being turned on, and an additional per-user "long code" (2^47-1 chips) that is synchronized with the aid of GPS receivers at the cells. Both operate at the same chip rate (1.2288 Mhz). The gory details can be found by anonymous FTP to lorien.qualcomm.com, in /pub/cdma. Read the "overview" document first. Phil

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