Search found 9 matches

by justvisiting
Mon Aug 18, 2014 9:21 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1404: Quantum Vacuum Virtual Plasma
Replies: 62
Views: 21812

Re: 1404: Quantum Vacuum Virtual Plasma

From the full report (which I acquired from 4chan of all places. Sorry, thread has expired.): During test run data takes at vacuum, the turbo pumps continue to run to maintain the hard vacuum environment. The high-frequency vibrations from the turbo pump have no noticeable effect on the testing sei...
by justvisiting
Sat Apr 12, 2014 4:19 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1354: "Heartbleed Explanation"
Replies: 71
Views: 32472

Re: 1354: "Heartbleed Explanation"

This is a great illustration. Even my mom understood. But what I'd like to know is why anybody thought this was a good design in the first place. I don't mean the specific bug where it fails to check the length, but why have it echo a variable length message? Why not just send "BEAT" and ...
by justvisiting
Fri Apr 11, 2014 7:49 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1353: "Heartbleed"
Replies: 99
Views: 31991

Re: 1353: "Heartbleed"

If C++ STL containers are being passed back and forth, yes, this becomes very relevant. And my post was only about writing an OpenSSL version in C++. But the point is that passing STL containers between client and server is never ever an option in this case because the protocol specification alread...
by justvisiting
Fri Apr 11, 2014 5:09 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1353: "Heartbleed"
Replies: 99
Views: 31991

Re: 1353: "Heartbleed"

Anyone who picks up a an app using an OpenSSL implementation built with, say, MSVC will have tremendous compatibility issues if the server's OpenSSL is built with, say, GCC or clang. Sorry, but that's not how it works. The SSL/TLS protocol specifies the format of data to be exchanged, which the cli...
by justvisiting
Thu Apr 10, 2014 2:50 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1353: "Heartbleed"
Replies: 99
Views: 31991

Re: 1353: "Heartbleed"

Right, and that's the part that's not being made clear in the mass-media version of "The Sky Has Fallen" reporting on this bug (as well as on the actual tech side. Yes, you will get 64k of memory from the server. But you don't control which 64k 1 . And even if you happen to get the server...
by justvisiting
Tue Mar 25, 2014 7:33 pm UTC
Forum: Science
Topic: Alcubierre drive (Warp Drive)
Replies: 77
Views: 18507

Re: Alcubierre drive (Warp Drive)

Do physicists, specializing in General Relativity claim otherwise? From what I've read the few that actually say anything about it do say something along the lines that warp drives, if they worked at all, could be used as time machines. Another point that may be relevant is that, from my (very) limi...
by justvisiting
Mon Mar 24, 2014 6:14 pm UTC
Forum: Science
Topic: Alcubierre drive (Warp Drive)
Replies: 77
Views: 18507

Re: Alcubierre drive (Warp Drive)

Sorry to resurrect this old thread, but if anybody is interested, here is a paper that shows that if you can build Alcubierre drives, you can use them to violate causality / time travel / potentially create paradoxes, etc: http://exvacuo.free.fr/div/Sciences/Dossiers/Time/A%20E%20Everett%20-%20Warp%...
by justvisiting
Tue Aug 13, 2013 11:10 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720372

Re: FTL Communication Breaking Causality?

Unless *all* ansible nodes are stationary relative to each other (in effect creating a privileged frame), you can still break causality Even if all ansibles were stationary relative to each other, wouldn't you also have to prohibit communication between the ansibles and "regular" objects ...
by justvisiting
Fri May 17, 2013 10:27 am UTC
Forum: Science
Topic: D-Wave Quantum Computer
Replies: 5
Views: 3630

Re: D-Wave Quantum Computer

For those who don't want to read Scott Aaronson's blog, here is one of the most important points: Namely, the same USC paper that reported the quantum annealing behavior of the D-Wave One, also showed no speed advantage whatsoever for quantum annealing over classical simulated annealing. In more det...

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