July 2018 - cypherpunks-legacy

Mobile Wifi Backpack
by brian-slashdotnews＠hyperreal.org 06 Jul '18

06 Jul '18

Link: http://slashdot.org/article.pl?sid=04/03/26/1841245 Posted by: michael, on 2004-03-26 20:20:00 Topic: wireless, 222 comments from the share-the-love dept. [1]ruzel writes "Julian Bleecker's web site [2]TechKwonDo describes [3]a project that is a wifi base station in a backpack. 'WiFi.Bedouin is a wearable, mobile 802.11b node disconnected from the global Internet. It forms a WiFi "island Internet" challenging conventional assumptions about WiFi and suggesting new architectures for digital networks that are based on physical proximity rather than solely connectivity.' The motivation is essentially subversive but what other uses are there for a device like this?" [4]Click Here References 1. mailto:ruzel@yahoo.com 2. http://www.techkwondo.com/ 3. http://www.techkwondo.com/projects/bedouin/index.html 4. http://ads.osdn.com/?ad_id=2683&alloc_id=6523&site_id=1&request_id=6363190&… =click&page=%2farticle%2epl ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> ______________________________________________________________ ICBM: 48.07078, 11.61144 http://www.leitl.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE http://moleculardevices.org http://nanomachines.net [demime 1.01d removed an attachment of type application/pgp-signature]

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Re: Sound filtering software.
by Michael Johnson 06 Jul '18

06 Jul '18

On Feb 2, 2005, at 12:01 AM, Joseph Chamberlain, DDS wrote: >Do any of you know of a software that I could use to isolate the >frequency >of the human voice and then clean everything else to make the recording >clearer and easier to listen to ? <slips on audio engineer hat> If I had a nickel for every client who came in my studio asking the same question... The human voice has an amazing range in frequency and in dB. It's one of the most versatile instruments ever. The subtleties are amazing when combining guttural sounds with sibilance and resonance, as well as air flow and labial manipulation (which you probably understand being a DDS). This presents a great difficulty when trying to do what you've just asked. For example, in television and radio, you have an effective frequency range of about 15kHz which is more than sufficient for the human voice. However, you're limited to 20dB of dynamic range. This isn't a problem if your speaker is doing a Ben Stein (Bueller? Bueller?) impression. On a cassette tape, you have about 40-50dB, and on 16 bit PCM digital audio, you have ~96dB (which is probably more than the room you're recording in or listening in). The human voice needs about 4kHz to be distinguishable from mumbling. The "presence" of the human voice is (arguably) around 3.8kHz. If you really want to do it right, you'll need about 12kHz to get everything without sounding like a telephone, although that could sound a bit too sibilant if you aren't careful. Basically, what you'll need is a bandpass filter and an expander. Here's what they do: Bandpass filter - Cuts off the low end below a certain frequency and the high end off at a different frequency. You get for example, 150Hz through 4kHz. Anything below 150Hz will be dropped and anything above 4kHz will be dropped. This should get rid of the rumble of the air handlers down low and the rush of the air through the vents up high. it will also sound a little muffled, but you should be able to hear everything just fine. Expander - Makes everything below a certain decibel level quieter. You set a cutoff point, for example 50dB. Anything below that point will unaffected. Everything above that point will be raised according to the ratio you set, for example 1:2, effectively making 60dB sound like 80dB (10dB above the setting at a 1:2 ratio gives a 20dB rise). Now, if there's a lot of noise, using these simple tools is not enough. Many/most recording studios have a "NoNoise?" suite, or "Pro Tools?" suite with DINR (Digidesign Intelligent Noise Reduction...pronounced like dinner). Each of these two applications will take a sample of the noise, and dynamically set filtering through the entire sound file to give you a "clean" version of the file. The software and hardware costs thousands of dollars, but it's well worth going to a studio where they've done this type thing before. It's not going to clean it up like you see on the spy thriller movies, but it can clean it up a lot to make things much more audible. IIRC, the Nat King Cole and Natalie Cole album, "Unforgettable", was done using Sonic Solutions NoNoise?. The engineers took the old recordings, cleaned up the noise, removed his vocal, and then recorded her vocal. When Kenny G came to Washington DC to play on BET, his monitor engineer came to my studio because they had lost/broken/whatever the original CD he used to "play with" Louis Armstrong. We loaded the song from CD, removed the saxophone at the certain points where Kenny played the melody (using DINR), and burned a new CD so he could play it live. This may be a little more power than you need, but it's effectively the same thing, and it sounds pretty good. It also took a LOT longer to do that that it would take to clean up your recording to make it more audible. Now, I'll take my audio engineer hat off and get back to being a UNIX administrator geek... <removes audio engineer hat and goes back to his slashdot hat> -Michael --------------------------------------- Sometimes your joy is the source of your smile, but sometimes your smile can be the source of your joy. --Thich Nhat Hanh _______________________________________________ Do not post admin requests to the list. They will be ignored. Scitech mailing list (Scitech(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/scitech/eugen%40leitl.org This email sent to eugen(a)leitl.org ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> ______________________________________________________________ ICBM: 48.07078, 11.61144 http://www.leitl.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE http://moleculardevices.org http://nanomachines.net [demime 1.01d removed an attachment of type application/pgp-signature]

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Re: nym-0.2 released (fwd)
by Jason Holt 06 Jul '18

06 Jul '18

On Sat, 1 Oct 2005, cyphrpunk wrote: >All these degrees of indirection look good on paper but are >problematic in practice. As the great Ulysses said, Pete, the personal rancor reflected in that remark I don't intend to dignify with comment. However, I would like to address your attitude of hopeless negativism. Consider the lilies of the g*dd*mn field...or h*ll, look at Delmar here as your paradigm of hope! [Pause] Delmar: Yeah, look at me. Okay, so maybe there's no personal rancor, but I do detect some hopeless negativism. Or perhaps it's unwarranted optimism that crypto-utopia will be here any moment now, flowing with milk and honey, ecash, infrastructure and multi show zero knowledge proofs. Maybe I just need a disclaimer: "Warning: this product favors simplicity over crypto-idealism; not for use in Utopia." Did I mention that my code is Free and (AFAIK) unencumbered? The reason I have separate token and cert servers is that I want to end up with a client cert that can be used in unmodified browsers and servers. The certs don't have to have personal information in them, but with indirection we cheaply get the ability to enfore some sort of structure on the certs. Plus, I spent as much time as it took me to write *both releases of nym* just trying to get ahold of the actual digest in an X.509 cert that needs to be signed by the CA (in order to have the token server sign that instead of a random token). That would have eliminated the separate token/cert steps, but required a really hideous issuing process and produced signatures whose form the CA could have no control over. (Clients could get signatures on IOUs, delegated CA certs, whatever.) (Side note to Steve Bellovin: having once again abandoned mortal combat with X.509, I retract my comment about the system not being broken...) >the security properties of the system. Hence it makes sense for all of them >to be run by a single entity. There can of course be multiple independent >such pseudonym services, each with its own policies. Sure, there's no reason for one entity not to run all three services; we're only talking about 2 CGI scripts and a web proxy anyway. Or, run a CA which serves multiple token servers, and issues certs with extensions specifying what kinds of tokens were "spent" to obtain the cert. Then web servers get articulated limiting from a single CA's certs. >In particular it is not clear that the use of a CA and a client >certificate buys you anything. Why not skip that step and allow the >gateway proxy simply to use tokens as user identifiers? Misbehaving >users get their tokens blacklisted. It buys not having to strap hacked-up code onto your web browser or server. Run the perl scripts once to get the cert, then use it with any browser and any server that knows about the CA. >There are two problems with providing client identifiers to Wikipedia. >The first is as discussed elsewhere, that making persistent pseudonyms >such as client identifiers (rather than pure certifications of >complaint-freeness) available to end services like Wikipedia hurts >privacy and is vulnerable to future exposure due to the lack of >forward secrecy. Great, you guys work up an RFC, then an IETF draft, then some Idemix code with all the ZK proofs. In the meantime, I'll be setting up my 349 lines of perl/shell code for whoever wants to use it. Whoops, I forgot the IP-rationing code; 373 lines. Actually, if all you want is complaint-free certifications, that's easy to put in the proxy; just make it serve up different identifiers each time and keep a table of which IDs map to which client certs. Makes it harder for the wikipedia admins to see patterns of abuse, though. They'd have to report each incident and let the proxy admin decide when the threshold is reached. >The second is that the necessary changes to the Wikipedia software are >probably more extensive than they might sound. Wikipedia tags each >("anonymous") edit with the IP address from which it came. This information >is displayed on the history page and is used widely throughout the site. >Changing Wikipedia to use some other kind of identifier is likely to have >far-reaching ramifications. Unless you can provide this "client idenfier" >as a sort of virtual IP (fits in 32 bits) which you don't mind being >displayed everywhere on the site (see objection 1), it is going to be >expensive to implement on the wiki side. There's that hopeless negativism again. Do you want a real solution or not? Because I can think of at least 2 ways to solve that problem in a practical setting, and that's assuming that your assumption about MediaWiki being limited to 4-byte identifiers is even correct. >The simpler solution is to have the gateway proxy not be a hidden >service but to be a public service on the net which has its own exit >IP addresses. It would be a sort of "virtual ISP" which helps >anonymous users to gain the rights and privileges of the identified, >including putting their reputations at risk if they misbehave. This >solution works out of the box for Wikipedia and other wikis, for blog >comments, and for any other HTTP service which is subject to abuse by >anonymous users. I suggest that you adapt your software to this usage >model, which is more general and probably easier to implement. Sure. I always meant for the gateway to exit on a public IP address. The reason to make it a hidden service is to keep n00bs from forgetting to turn on tor when they talk to the proxy. Thanks for clarifying, though. -J ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.leitl.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE [demime 1.01d removed an attachment of type application/pgp-signature which had a name of signature.asc]

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Re: [liberationtech] Police using social media for surveillance? -- send us your thoughts
by Fabio Pietrosanti (naif) 06 Jul '18

06 Jul '18

Have you saw tools such as Maltego [1] and/or Palantir [2] to apply deep OSINT techniques, including social network monitoring and analysis? Those stuff are already widely used by two kind of people: - Marketing - Security (being private/public, democratic or non-democratic) I am sometime curious to see this huge attention to surveillance technologies like if it's "something new", while it always existed, it's there publicly known on the website of surveillance producers and at surveillance trade-expo. There are also very nice tools [3] to handle "group of investigators" doing infiltration in social network using multiple identities, quite nice tools i've evaluated in past. -naif [1] - http://maltego.blogspot.com/2011/10/maltego-and-social-networks-video.html [2] - http://www.palantir.com/labs/social-network-analysis [3] - http://www.terrogence.com/product.php?ID=15 On 2/20/12 5:03 AM, Rami Khater wrote: > Hi all, > > Tomorrow (Monday Feb 20th) The Stream is doing a show on how police use social media. Some say it involves the public in community policing and others raise privacy concerns. > > You can participate in the conversation live at 19:30 GMT (2:30 PM EST) via http://stream.aljazeera.com and via the hashtag #ajstream on twitter anytime. _______________________________________________ liberationtech mailing list liberationtech(a)lists.stanford.edu Should you need to change your subscription options, please go to: https://mailman.stanford.edu/mailman/listinfo/liberationtech If you would like to receive a daily digest, click "yes" (once you click above) next to "would you like to receive list mail batched in a daily digest?" You will need the user name and password you receive from the list moderator in monthly reminders. Should you need immediate assistance, please contact the list moderator. Please don't forget to follow us on http://twitter.com/#!/Liberationtech ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE

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by registration＠ifilm.com 06 Jul '18

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by registration＠ifilm.com 06 Jul '18

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by registration＠ifilm.com 06 Jul '18

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by registration＠ifilm.com 06 Jul '18

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