An encryption method that can detect eavesdropping. Using optical transmission to send a secret key to the other side, quantum cryptography draws on the inherent properties of photons, which become slightly altered if they are observed by an intruder. When an alteration is detected, the receiver knows the sender's key has been compromised. See cryptography.
Polarized and Entangled Photons
One method relies on the polarization of the photons, which will be altered if observed (see QKD). Another method uses photon pairs that exhibit a correlation between them. Any observation along the way weakens the correlation, which can be detected.
Polarized and Entangled Photons
One method relies on the polarization of the photons, which will be altered if observed (see QKD). Another method uses photon pairs that exhibit a correlation between them. Any observation along the way weakens the correlation, which can be detected.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Nanospheres moving faster than light?
- Nanospheres moving faster than light?English?Seriously, zdnet is not a science journal. It all sounds interesting, but understand the article requires prior understanding of other concepts.From what i gather they are saying the "faster than light limit" does not apply to these objects because they are not light?I also have...
- Discussion threads 2008-08-20
- Is the enterprise ready for cloud computing?
- Is the enterprise ready for cloud computing?My boss likes to look at IT as a cost...center. I asked him the other day to turn off all computers then try to do business. He said he couldn't. Well then it looks like your IT is responsible for 100% of your revenue....
- Discussion threads 2008-08-19
- Google releases open-source crypto toolkit
- Google's security team has released an open-source cryptographic toolkit aimed at making it easier and safer for developers to use cryptography in their applications. The toolkit, called KeyCzar, was originally developed by Steve Weis Google and Arkajit Dey MIT and is available under an Apache 2.0...
- Blog posts 2008-08-11
- How OpenDNS, PowerDNS and MaraDNS remained unaffected by the DNS cache poisoning vulnerability
- The short answer is being paranoid about tackling a known vulnerability. It's 2001, and Daniel J. Bernstein DJB, author of the then popular djbdns security-aware DNS implementation, is applying basic math principles to raise awareness on what's to turn into the "sky is falling" critical Internet vulnerability in 2008, in...
- Blog posts 2008-07-25
- E-gold owners plead guilty to money laundering
- E-gold owners plead guilty to money launderingGoodbye privacy?Cash leads to crime, too. Should we enforce credit/debit card payments only? If so, let's ban gold trading altogether!I will be obvious and boring then...[Please excuse my poor "Engrish" and my rushed-up style.]Hi guys.I don't agree with your opinion and thought a very...
- Discussion threads 2008-07-22
- Amanda Chapel, aka "Strumpette," needs some tough love
- I had a strange Twitter back-and-forth with "Amanda Chapel," the pseudonymous authors of a PR blog called "Strumpette," about the nature of the hacker ethic. I personally don't think the hacker ethic is very effective as a counterpoint to the system of intellectual property it decries, because hackers seem intent...
- Blog posts 2008-07-14
- $1 Million prize offered for cracking an encryption algorithm
- It's 2008, and companies perhaps rich on VC money to waste in a guerilla marketing tactic for generating viral buzz, still talk and act as the utopian "unbreakable encryption" algorithm is the panacea of security, or the "Hackers Hell: Privacy That Can't Be Compromised" as they pitch it. ...
- Blog posts 2008-07-07
- Physics - getting a raw deal in schools?
- Physics - getting a raw deal in schools?physics is not a fundamental application of mathsPhysics is the basis for understanding any physical phenomenon. I do not see any sense in studying biology w/o a strong physics curriculum, as w/o physics you will have a hard time understanding what...
- Discussion threads 2008-06-30
- Security researchers hack the London underground train for free ride
- A group of Dutch security researchers were able to clone the "smartcards" that commuters use to pay fares in the London Underground system, allowing the group to ride for free. This is an interesting attack vector that I actually talked to Adam Laurie about when I was at Black Hat Amsterdam. ...
- Blog posts 2008-06-26
- What do the British really believe about global warming?
- What do the British really believe about global warming?lolu got ot be kidding meRE: What do the British really believe about global warming?You have got to be kidding! I can not remember when it really snowed properly in the UK, we are seeing greater instances or extreme weather such...
- Discussion threads 2008-06-26
- Reformed computer criminals - your country needs you
- And trust me, they really do. Over the last year, the UK and US Governments have had an awful problem in keeping basic data protection rules in check, almost to the point where they may have been broadcasting over the radio minutes of the intelligence committee meetings. ...
- Blog posts 2008-06-26
- Microsoft's manycore strategy
- The post on Apple's Grand Central multicore support in OS X.vi had some commenters claiming that Microsoft had already solved the multicore software problem. Far from it. And Microsoft knows it Microsoft has a multi-pronged campaign to get in front of multicore. They're hiring smart...
- Blog posts 2008-06-25
- Western Digital VelociRaptor - Plenty of bark, not enough bite
- Western Digital VelociRaptor - Plenty of bark, not enough biteI definitely want onenot sure I can justify the price. I saw the 750GB WD drives at Fry's for 109.00 on sale. What's the fastest 750Gb I wonder?I want one and i will tell you why.Gaming.When playing a game, you need...
- Discussion threads 2008-06-20
- Meon (cab)
- n 1997, Professor Tagishaki, from Tokyo Quantum Mecanics institute, found new elementaries particles that he called Meons. In this puzzle game, you must solve more than 120 levels to free Meons. Use Prism, Splitter and other various tools to light all the Meons and solve the Light Quest! Incredible graphics...
- Software downloads 2008-06-20
- Photos: Snapshots from HP Labs
- Hewlett-Packard's Bristol, England, facility offers a glimpse of emerging tech for its Snapfish site, the Mscapes location app, and even a stab at quantum computing. by CNET News.com
- Image galleries 2008-06-11
- SAP's Business byDesign: the perfection conundrum
- SAP's Business byDesign: the perfection conundrumUI problems? Mike, I wonder if they are having trouble with the user interface? Last November in a post called Enterprise Applications and User Interfaces , I wrote that: “There are changes afoot in the way enterprise applications are sold....
- Discussion threads 2008-05-21
- First look at OpenOffice.org 3.0 beta
- First look at OpenOffice.org 3.0 betaOLD NEWS: Don't expect OpenOffice to develop more perfect compatibilityI gave up on OpenOffice a long long time ago and I'm not surprised that the compatibility is still pitiful. OpenOffice's Presentation could never handle PowerPoint files properly. OpenOffice's Writer could handle simple documents,...
- Discussion threads 2008-05-09
- Live Webcast: Virtual Service Oriented Grids: Transforming the Enterprise
- One of the most powerful features of computing grids is the capability to identify and allocate resources needed to build and run applications on demand and in almost real time, without months of negotiation or waiting for the hardware procurement cycle to facilitate it. While most discussions...
- Webcasts 2008-04-22
- SOA and compute clouds point to rethinking data entirely: roles and permissions, not rows and tables
- There's nothing like a conversation to bring out insights and new ideas. Tony Baer and I were chatting on this very pearl of productivity last week, that an open roundtable analyst call always allowed us to move the needle forward in terms of thought leadership in ways that solo writing...
- Blog posts 2008-04-15
- The obligatory 'Victoria Falls' post
- For those who don't know, Sun's new T2+ machines extend the T2's CMT capabilities across multiple units to produce 16 and 32 core SMP machines capable of handling 128 and 256 concurrent threads respectively. Sun blogger Denis Sheahan provides a good overview of the current dual...
- Blog posts 2008-04-15
Neighboring Terms
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- ZDNet News Videos
-
Tech news covering the latest in products, conferences and blog commentary, from ZDNet video.
- Watch the latest video >>
- Demo: Virtualization with the Intel® Xeon® Processor
-
In this Flash demo, you'll learn about virtualization performance and features ideal for consolidation, load balancing, and disaster recovery with leading enterprise reliability.
- Watch how the Intel Xeon processor can increase performance and reliability of your servers >>
Ultraportables
- Understanding Ultraportable Laptops (BNET)
- Five steps to protect mobile devices anywhere, anytime (TechRepublic)
- View all ZDNet Toshiba laptop reviews
- From our sponsors
- Toshiba Satellite® U400 Series
-
- The ultra-portable, ultra-stylish Satellite® U405 is a smart choice for you and your small business. Only from the laptop expert, Toshiba. Explore the complete laptop lineup »
-
