Recectly, the state of Minnesota decided that only Certified Electricians can legally install low voltage electrical cable, which includes network and alarm system wiring. Here's http://www.mwpersons.com/articles/3-12-01-licensin g.htmlone man's story with a link to the relevant code. Gotta make sure those network cables don't electrocute anybody.
If you're a student, try Advanced Circuits next time you need a board fabbed. They do small runs (can order 1 or 2 boards - don't need to order in the 10's or 100's) at reasonable prices. Their boards are high quality - you don't just get copper on fr4, you also get a solder mask and silkscreen. Give them a try.
When doing math, it is generally assumed that "log" indicates the natural logarithm, as base 10 holds no special meaning to mathmaticians. Because using both log and ln would be redundant, "ln" is never used. Only log(x) (to indicate "log base e") and "log base R(x)" where R is some number, are used.
"I bet they just index every message and check it against a list of "flags" - names, phrases, addresses or other terms related to ongoing investigations. If a message turns up a flag, the Carnivore notifies HQ and the message is logged. I bet the From:, To:, Cc: and Bcc: addresses immediately become flags as well."
So if i'm flagged, and i send mail to someone, they become flagged? Buy a list of addreses, stick in the one you want. Write in code which is not obvious. Whammo. Ten thousand people are flagged, and don't know anything. They go about, sending their standard mail, and everyone is flagged.
Ok. Thats funny. An offhanded post intended to be silly, possibly entertaining, was taken as a serious thought. When was the "funny" removed from slashdot?
Hey, predicting my death are ya? How's it gunna be? Please, not something boring like drunk driving or aids or lung cancer from all of those cigarettes I never smoked. At least let it be cool, like getting impaled by rebar shot from a railgun, or having my sole stolen by Microsoft.
In observer's frame, time elapsed = t/sqrt(1-v^2/C^2). As v-> (and passes) c, the term on the bottom becomes 1-(something greater than 1), and we have time elapsed = t/imaginary number.
However, this will not (I don't think. I'll have to try later) transform correctly. The whole purpose of relativity is to let the math transform to any frame of reference. Therefore the whole situation in which something (a signal, anything at all) goes faster than the speed of light is not allowed by relativity.
"also, waves of any type behave very similarly, whether they are electromagnetic or mechanical."
I beg to differ. While em waves are often explained using their mechanical cousins, they are indeed quite different. I'll illustrate the differences between sound waves and light waves.
Sound waves propagate through collisions. A set of vibrating atoms collides with another set, which in turn starts to vibrate, and so on. Energy is transferred through the motion of atoms. Mechanical waves need matter to propagate. As matter becomes more dense (water vs. air), the collisions occur with less time between. Thus, the signal is transmitted more quickly through dense materials.
Em waves, on the other hand, do not require any medium for propagation. All that is required for em radiation is a disturbance in the field. In this situation, atoms and molecules act like little repeaters, absorbing the wave, and later spitting it back out. Em waves are slowed by matter.
We really don't need to worry. When the day of quantum computing comes, today's encryption methods will still be used. Why? It will be impossible to create a key with quantum methods.
Quantum methods of computing will be used primarily for efficiency. They will be designed from the ground up. A lot has been done in the computation theory sector, and if we start with something new and radical we will surely see one thing: reversability. It is this ability that makes quantum computing so attractive. If you need results, but not now, give the system a little energy to slowly prod it forward. Need results now? Waste a little more energy on heat.
Quantum algorithms may be used to compute very complex systems, because they are excellent at chance. This will be of some use in cracking standard keys. However, encryption through quantum methods will never be possible.
In the end, quantum computing may make it trivial to break 'quantum encription', but it will not pose much of a threat to traditional irreversible methods of key generation. I think our data is safe for now.
Reversible computing. Is that anything like an old navy reversible tech-vest?
Slashdot Mirror
more simply: an irrational number cannot be described as a ratio of two integers.
Recectly, the state of Minnesota decided that only Certified Electricians can legally install low voltage electrical cable, which includes network and alarm system wiring. Here's http://www.mwpersons.com/articles/3-12-01-licensin g.htmlone man's story with a link to the relevant code. Gotta make sure those network cables don't electrocute anybody.
If you're a student, try Advanced Circuits next time you need a board fabbed. They do small runs (can order 1 or 2 boards - don't need to order in the 10's or 100's) at reasonable prices. Their boards are high quality - you don't just get copper on fr4, you also get a solder mask and silkscreen. Give them a try.
When doing math, it is generally assumed that "log" indicates the natural logarithm, as base 10 holds no special meaning to mathmaticians. Because using both log and ln would be redundant, "ln" is never used. Only log(x) (to indicate "log base e") and "log base R(x)" where R is some number, are used.
Upon viewing this comic, I knew that Gabe had his head screwed on right. Perhaps he was involved with the training of these spy gerbils.
Peace,
Teslakid
Actually, real American College students stay up until 7AM, skip class and sleep till 5, only to party all night.
Up and down. How strange.
"I bet they just index every message and check it against a list of "flags" - names, phrases, addresses or other terms related to ongoing investigations. If a message turns up a flag, the Carnivore notifies HQ and the message is logged. I bet the From:, To:, Cc: and Bcc: addresses immediately become flags as well."
So if i'm flagged, and i send mail to someone, they become flagged? Buy a list of addreses, stick in the one you want. Write in code which is not obvious. Whammo. Ten thousand people are flagged, and don't know anything. They go about, sending their standard mail, and everyone is flagged.
Teslakid
Teslakid
Teslakid
Hey, predicting my death are ya? How's it gunna be? Please, not something boring like drunk driving or aids or lung cancer from all of those cigarettes I never smoked. At least let it be cool, like getting impaled by rebar shot from a railgun, or having my sole stolen by Microsoft.
Can't you see the violence inherent in the system?
In frame of photon/signal/wave/whatever: time=t
In observer's frame, time elapsed = t/sqrt(1-v^2/C^2). As v-> (and passes) c, the term on the bottom becomes 1-(something greater than 1), and we have time elapsed = t/imaginary number.
However, this will not (I don't think. I'll have to try later) transform correctly. The whole purpose of relativity is to let the math transform to any frame of reference. Therefore the whole situation in which something (a signal, anything at all) goes faster than the speed of light is not allowed by relativity.
Don't flame me, I'm just a high school student
Teslakid
"also, waves of any type behave very similarly, whether they are electromagnetic or mechanical."
I beg to differ. While em waves are often explained using their mechanical cousins, they are indeed quite different. I'll illustrate the differences between sound waves and light waves.
Sound waves propagate through collisions. A set of vibrating atoms collides with another set, which in turn starts to vibrate, and so on. Energy is transferred through the motion of atoms. Mechanical waves need matter to propagate. As matter becomes more dense (water vs. air), the collisions occur with less time between. Thus, the signal is transmitted more quickly through dense materials.
Em waves, on the other hand, do not require any medium for propagation. All that is required for em radiation is a disturbance in the field. In this situation, atoms and molecules act like little repeaters, absorbing the wave, and later spitting it back out. Em waves are slowed by matter.
Hope this clears things up.
Teslakid
Quantum methods of computing will be used primarily for efficiency. They will be designed from the ground up. A lot has been done in the computation theory sector, and if we start with something new and radical we will surely see one thing: reversability. It is this ability that makes quantum computing so attractive. If you need results, but not now, give the system a little energy to slowly prod it forward. Need results now? Waste a little more energy on heat.
Quantum algorithms may be used to compute very complex systems, because they are excellent at chance. This will be of some use in cracking standard keys. However, encryption through quantum methods will never be possible.
In the end, quantum computing may make it trivial to break 'quantum encription', but it will not pose much of a threat to traditional irreversible methods of key generation. I think our data is safe for now.
Reversible computing. Is that anything like an old navy reversible tech-vest?
teslakid