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Practical Quantum Cryptography
Alien54 writes: "Saw this on Eureka Alert: A commercially available system for quantum key distribution and cryptography has been released by a spin-off company from the University of Geneva. The system has been tested over distances up to 70km (from Geneva to Lausanne) through standard optical fiber cables and connects to PCs via USB ports. Transmission rates of about 60 bits per seconds were achieved, sufficient for key distribution. You can see the original abstract here, which also has a link for download of the paper in PDF, Postscript, and other formats."
first post
eat my ass!
Pissy!
Tech specs here.
Neato. When we get a "Quantum Crypto IP Backbone" that will be cool.
Of course QC is really only secure when they are direct connections. So if we want to use routers and switches to make connectivity practical we will lose the security.
This type of thing would be cool for businesses and such that want a secure connection with other branches or offices. They could do a token ring style idea where they relay from their own branches to reach a wide area.
Tom
Someday, I'll have a real sig.
Because quantum key distribution is immune to factorization breakthroughs!
4 28303184581123062450458870768760594321234762576642 74945547644195154275867433811981387466471553446001 28172402854835142675669719253496205220699188798491 81484706819044791457088226110939902411592763469776 33946326637808872646881505242830850704932797792349 29990615521801952267534305575027779393713330209195 00860225343124870843796867881478506011320772871728 19942445113232019492229554237898606631074891074722 42561739680319169243814676235712934292299974411361
6 92569409724669036067145935665469179209556046350643 13650735649742880036461009375273062497609978034621 28542518686344030635843911820718776925659054905814 34421018260726150246940722888295355624667254579581
4 18122726805813382156225921428772801214922594206458 07834997795076354606802490111106153804429088209985 42738154413103798892589988519726447464444686565204 60558816777620924293750629417010292417375848211381
RSA-500 = 1897194133748626656330534743317202527237183591953
= 3742712177062058309132142475474122439840170094313
* 5069035619078461342194397405029748827473917947039
Was it a spin-off company, or perhaps just a spin-up or spin-down company?
Propz to all the fp'ing ac's. Logged in trolls sucl azz. Woot! indeed.
As nice as this scheme might be compared to previous quantum cryptography schemes, there are still fundamental problemns with implementing quantum cryptography. First off, you need a single, otherwise unused optical fiber to connect the two boxes. This means running your own cable. There's really no way around that. You're not going to find unrepeated, unused fiber just lying around.
vi is my shepard, I shall not font.
eat my ass!
Are we supposed to munch on your meaty buttocks, or instead feed directly upon your sweaty asshole? The distinction is critical. Until your position is clarified, I will continue eating out your mother's sloppy pussy instead.
The goatse guy for president. Win one for the gaper!
The conclusion of the article states that the system is currently commercially available. Here is a link to the QKD System.
-- Find the Truth...
Proof that you don't need to pay 20'000$ a year to study in a University doing advanced research.
I went to University of Geneva, I paid 300$ a semester, poor students(decided by their income) pay 40$ a semester, and this is valid for every department.
Now, if only US Universities could learn from them...
Oh, before the argument comes: no, in Switzerland we don't pay much more taxes than in USA, we pay a bit more, but not that much.
I wonder if it's legal to import these things to the united states?
---
Play Six Pack Man. I
as much as quantum computing doesnt interest me the fact is they do cool sounding shit that doesnt go anywhere or change my life in anyway way therefore this is useless you linux fags!
I found a site that explains why classic cryptography suffers when compared to the benefits of quantum cryptographic methods.
The site is located at http://www.qubit.org/intros/crypt.html, and is part of the Center for Quantum Computation (Oxford University).
Here's a nice basic overview of QC from the site mentioned above: "While classical cryptography employs various mathematical techniques to restrict eavesdroppers from learning the contents of encrypted messages, in quantum mechanics the information is protected by the laws of physics. In classical cryptography an absolute security of information cannot be guaranteed. The Heisenberg uncertainty principle and quantum entanglement can be exploited in a system of secure communication, often referred to as "quantum cryptography". Quantum cryptography provides means for two parties to exchange a enciphering key over a private channel with complete security of communication."
Linux > Help > About
But once you know the key know how are you sure it is the correct one out of an infinite set of key in an infinite set of universes that exists silmultaneously????
Great. As practical applications of quantum physics become widespread (outside of silicon engineering plants) maybe the mindset shift accompanies it will really take root.
Maybe writers like Frijof Capra, Danah Zohar and even to some extent Roger Penrose will become less hokey in the mainstream view.
You only have to look around the world that is a product of mechanistic thinking - the simplistic cause and effect rationality of Bush's tyrades, the lack of dialectic thinking in politics in general to see that this shift is ripe in the making.
pw:secret
You probably recall how quantum computation works: essentially you shove all the extra computation off into parallel universes and then get the answer back when it comes. Why not expand on that idea and use quantum file storage? The RIAA can create CDs where only part of the audio track exists in our universe and the rest is retrieved from parallel universes by your quantum audio system. This makes file copying mathematically impossible.
Now someone is probably going to pop up and say "well, I can pirate the signal after it has been revirtualized from the quantum foam". I'm glad you brought that up because it leads right into phase two of my idea. In order to listen to music, all consumers would be have sound-decoding chips implanted in their brains. The music would be beamed directly into your head from your audio system.
Thus we see that file copying can be made impossible by those that are willing to pay the price of our freedom. The only solution is to keep quantum computers from becoming a reality
Not nearly secure. Physics protects this communication from straight interception. However, it does not protect it from interception and then retransmission. But cool buzzwords. They'll make a little bit of cash before the con is up.
put that one in the NSA's pipe and smoke it.
Great...all my encryption problems are solved!!! And not a moment too soon, either...
:-)
After all, I was getting a bit nervous with respect to my encryption needs in light of the retirement of further development of PGP and the possible inadequacies of GnuPG...
Beer is proof that God loves us and wants us to be happy. -- Benjamin Franklin
Well, I wasn't too sure, so I dug up some links to try and help myself and others understand this:m /quantum-index.html
http://research.microsoft.com/~gottesma/QKD.html
http://www.qubit.org/intros/crypt.html
http://www.ecst.csuchico.edu/~atman/Crypto/quantu
The last link is particularly +1 insightful about the basics of quantum cryptography.
I posted to
Home Page here:
www.idquantique.com/index.html
"It is a greater offense to steal men's labor, than their clothes"
Now someone is probably going to pop up and say "well, I can pirate the signal after it has been revirtualized from the quantum foam". I'm glad you brought that up because it leads right into phase two of my idea. In order to listen to music, all consumers would be have sound-decoding chips implanted in their brains. The music would be beamed directly into your head from your audio system.
Exploring the troll within one's self can be a confusing experience. First, one must recognize the term troll often is used to describe several different style of postings. It can be used in a general sense to describe crapflooding posts, flame-baiting posts, page-tweaking posts (PLP's and PWP's), and true trolls. After one makes the distinction that a more specific definition of "troll" exists, the curious mind must find its meaning.
Is a troll simply a post that contradicts popular opinion? Is it a post that gathers many replies? Is it a post that argues a point that you don't really believe? Is it a post that argues for an opinion you don't even understand? Is it a post that is only meant to annoy a large number of people? Or is it a post that is purely intended to encourage real debate? There may be many other possibilities that I haven't considered yet, but these are the ones I can quantify.
These all appear to be valid motives of the many veteran trolls. So, how to you become proficient at this art? Well the following is a quote I found etched within the inner chambers of a 1000 year old temple in Nepal. I share these publicly for the first time, here on Trollaxor.com.
It seems one must have a well defined perception of their own beliefs, and then be able to dis-prove them all... in ones mind, build an undeniable proof of a fact, and then be able to prove it fiction... understand ones audience, their weaknesses, their strengths, what irritates them, what they believe as holy truth... one must be resourceful with their research on issues they don't completely understand, and be able to project confidence in the knowledge they find...
One must become Tuan-chi Muho. Find your beliefs and remove your mind's limitation to only believing that single thought path, then understand all other possible thought paths... understanding the individual has the ability to choose any of these paths, but chooses not to limit one's thoughts by only exploring a single path. One must be able to take these insights and use them against their foes.
Go forth now... and troll
Are those spelling mistakes OCR typos or a secret embedded message? Oh well, noticed it now, I guess the gig is up.
It only comes in three colors.
You could be helping terrorists learn about
cryptography.
Very truly yours,
J. Ashcroft and T. Ridge
It's very near April Fools Day. Could this be a joke?
I farted and a pea rolled out.
Shut the fuck up. I don't mind paying more money. I can afford more money and a higher percentage of my income going to taxes than someone making minimum wage. if I pay 40 percent, I still have more afterwards than someone making half as much and being taxed accordingly.
Also, I have a trust fund. When I sell stuff off, I pay capital gains (not gaines) taxes, and yes, I don't love having to pay taxes, but yes, being well off, and owing that position in life as much to society in america as well as my own work and that of my parents, I can and should shoulder a greater part of the burden of running the country.
That said, I don't like how much of the government is run. But it's completely fair to have people pay more if they can. You're not being penalized for being successful, you're being asked to give more because you can. People aren't poor to avoid paying taxes, they're poor because they can't do better. You right wing loonies bug the crap out of me.
What makes the transfer secure is that the two parties involved don't reveal their polarizer settings until AFTER the bits have been transferred. By which time, it's too late for the "man in the middle" to go back and change his answers.
It's really quite clever...
-Mark
if anyone wants to read more look for this book which covers the history of cryptography from ancient egypt to quantum cryptography...i read it, and it was extremely interesting from a mathematical and computer point of view...it includes a whole section of the theories behind quantum computing and quantum cryptography...
"Facts are meaningless. You could use facts to prove anything that's even remotely true." - Homer Simpson
And I just bought a newtonian key distribution system! The vendor told me quantum mechanics was nonsense.
... "Give me a woman who loves beer and I will conquer the w
But how do you know who the recipient is? QC offers no authentication. If you have to use public key for authentication, what advantage is gained by using superior methods for confidentiality?
The only one I can think of is that, with conventional cryptography, you can capture the data stream and crack it "off-line". I suppose that this is significant: with QC you only have to worry about whether they've cracked your private key (that you will use for authentication) already, not whether they can in 100 years (because you've used it for encryption).
Another argument might be that it is easier to eavesdrop on a channel than to redirect it. But that seems like a dubious assumption, if the enemy is determined.
Thoughts?
The evaluation of an action as 'practical' . . . depends on what it is that one wishes to practice.
First rule of quantum mechanics: just because it's been done, doesn't mean it can be done.
That's not a lot of data. How can it be practical? As proof of concept, it's great, but to actually use quantum crypto for one-time pads you need to be able to transmit as much key information as you have data. That requires great speed, as much as you would expect to be able to transmit your encrypted data itself. You could use 60 bits/second for secure exchange of conventional keys, but there are already very safe ways of doing that. Using quantum crypto for that is a total waste because the added benefit of the QC is nullified by the fact that you're using it to exchange non-one-time-pad, and hence crackable, keys.
A while back there was all these studies and experiments about duplicating light beams. I recall mentions of quantum entanglment and such (stuff that's used in these secure quantum transmision schemes).
Could one of these duplication beams be used w/out being detected? I know normal reception and retransmission IS detectable.
its impractical. other than two interconnected static locations transferring secrets its impractical in its current form.
This is amusing.
.com, and a dude who was contracted to "write the software." During the course of developing the software, it became completely obvious that
I knew a dude who started a quantum
1) quantum crypto was good for random number generation
2) " " was bad for encryption
The theory is that bouncing messages, throwing in noise, and using transmission latency entropy you could get keyless exchange... the reality was (according the guy who was writing the software who was summarily fired when he provided an example of how it could be broken) it still is prone to man in the middle.
I put quantum encryption up there with the rest of the dot com snake oil.
"I have a cure for the common cold! Give me millions to bring it to market and make you investors rich!"
"Ok, great, let's do it. Oh, by the way, what is the cure?"
"Its a highly advanced constriction system that is placed over the aspiratory orifaces that eliminates the environment virii or bacteria require to propagate."
"Hmm... looks like a bag."
"Its made of world class, space aged, hydrocarbon based materials! We have patent pending."
"Hmm... a plastic bag. Doesn't it kill the patient?"
"We don't see it that way. We prefer to think of it as 100% effective in eliminating the root cause."
/\/\icro/\/\uncher
However, like many of their announcements, they couldn't place a time or date when it would be released...
IANAL, but I've seen actors play them on TV
Schroedinger's cat may have sacrificed its life to make this product a reality. Or maybe not. Only Heisenberg knows for sure.
Nuff said? I think so.
The whole benefit is the un-eavesdroppable exchange of OTPs. And yes, OTPs MUST equal the length of the message to be transmitted. Doh.
Man, you made my day. This may lead some to wonder how boring my day is. It's pretty boring.
"RIAA can create CDs where only part of the audio track exists in our universe..."
I would bet this appeals a lot to RIAA. But why stop there? From what I understand they're looking for a way to sell you the CD so that there's actually no music on it.
Perhaps just a recording of one of the executives in charge saying "Thank you for purchasing this digital music container device. We assume that you have a computer and have downloaded countless megabytes of our copyrighted material. Therefore, we have pre-removed the equivalent amount of data from this CD. Enjoy." Followed by 71 and 3/4 minutes of silence.
Sweat
It breaks my pluginses, my precious!
yeah, I know a guy that got fired from his job at Boeing for proving that his anti-gravity system worked. Boeing wanted non of it, told him that 'This company obeys the laws of physics'.
Can you direct us to a page with his proof on it? From what I've seen if Eve is trying to listen, then both ends know about it and can send a bouncer type to go kick Eve's ass off the line...If your friend can provide an example of how QC can be broken then I think all of slashdot would like to hear it. (the rest of the world is unimportant)
If Mr. Edison had thought smarter he wouldn't sweat as much. --Nikola Tesla
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And that completes our tour of Hilbert Space. Any questions?
Oh for crying out loud! Who let that cat in here? Now I don't even know what i said. That's one dead cat if I ever get my hands on it.
intellectual property law is philosophically incoherent. it is your moral duty to ignore it or sabotage it
Hmmm, your encrypted data does not look statistically random to me :-) Try this instead ...
y 3K KqtXZb3ljA/oM98PLKjfAhfRqbo1JqO4UUYUu25djiS7Ove45l pmoaSycP8T+usdqcJFtNwUrTelCNEUe9dJPbXGuGgR7JjzA9Xx 6dzu76z3XH/rf51Tx1iM8bI7EcT1ijfWt8s59J/JZpHbxJ1Vxa PHYchy
qANQR1DBwE4DmBod8oWMnB5+t0opVD15zJPHNvLYF1MxaUO
xkcd is not in the sudoers file. This incident will be reported.
It's not random. The letter patterns are close together on a keyboard, for which you can deduce that it's just a crapflood.
Well that's pretty fast for the swiss...
using satellites orbiting the earth. you can authenticate the satellite by determining its altitude. if your connection is interrupted and then rejoined by a "man in the middle" then you will recognize that they are at a lower altitude than your authentic satellite.
mod this up as funny even if you don't know why. lmao!
Redirection isn't a problem either; to redirect the stream you'd have to observe it, and by observing it you will change it, and make it impossible to view the messages.
I guess you could always kill the recipient and read his messages, but any form of cryptography short of biometric (and others have pointed out the flaws in that) will be vulnerable to that attack.
Because I found your comment amusing. The only problem with the 71 and 3/4 minutes of silence is that before long people will clamouring for those CDS. What is preferable, N'sync or 72 mins of silence?
I mean interception, not man-in-the-middle. I cut your fiber and read your photons, without trying to pass them on to the intended recipient. Then, when you try to contact the recipient over some "conventional" channel for phase two (comparing the polarities on the two ends), I intercept that, and we discuss the polarities I intercepted. You require that my messages be signed by the intended recipient, of course, but I've broken RSA, so no problem. Then, you send the message xor'ed with the random bits, and I intercept that. I've stolen the message, and you're none the wiser.
The evaluation of an action as 'practical' . . . depends on what it is that one wishes to practice.
Here is an article in Information Security magazine explaining how quantum cryptography works and why it is significant:
1 /f eatures_crypto.shtml
http://www.infosecuritymag.com/articles/august0
"Don't touch anything."
The Law of Falling Bodies