True random number generator

[divisortheory]

http://random.irb.hr/

I don't feel like going into RNG or PRNG theory, but anyway this is pretty awesome.

[MisterBob]

Wow, wasn't expecting to see something like this for a few more years.

[MisterBob]

hah! To sign up I had to take the derivative of something using the chain rule, that's hilarious.

[Octavious]

lol, they had me do the same thing, rofl. Calculus actually paid off...finally...about f--king time...

edit:

" Find the least real zero of the polynomial: "

lol, my friend at work just registered, got that. lol...math to register...wow

[divisortheory]

http://kalia.ultimals.com/register.JPG

[Epincus]

http://kalia.ultimals.com/register.JPG

Holy shit, I know how to answer those questions. I'm going to use the generator now just because I can.

[Octavious]

d/dx[7sin(7*2?+?/2)+4cos(2? -?2)]

d/dx[7sin(14?+?/2)+4cos(3?/2)]

d/dx [7sin(27?/2) + 4cos(3?/2)]

The question is, if i'm taking the integral whats my upper bound if x=2? is the lower? >.>)/

[MisterBob]

Uh, d/dx means to take the derivative, not integrate....

[crazyrabbit]

http://www.gwebspace.de/crazyrabbit/bilder10/random.jpg

doh... this is a real challenge D:
Anyway, what are people using these random numbers for? I kinda don't get it.

[divisortheory]

doh... this is a real challenge D:
Anyway, what are people using these random numbers for? I kinda don't get it.

Random numbers are used in practically every piece of software in the world. Well, maybe not every piece, but they're pretty important. In some types of software, for example cryptography, real time embedded systems, etc you want to design software in such a way that it is provably impossible to guess the next number under any circumstances. Software approaches to generating random numbers fail in this respect, it is theoretically impossible to generate "true" random numbers using a software only approach. So they are called "pseud-random numbers" instead. What's available from this website is the ability to generate "true" random numbers. While techniques have been available in the past, they have not been widely and freely available, and certainly not with a nice windows / linux interface for anyone to use.

[Devek]

Ya, cause when i'm doing cryptography I want to contact a non-local third party site to get my "truly random" number to get it.

I'll pass

Anything else that isn't security related, pseudo-rand is good enough and sometimes better(hell, I wish ffxi used a less random system). Hardware solutions are cheap and work pretty damn good and even my old commodore 64 had one built into the sound chip.

So basically.. you can't use this for security and for anything else it doesn't really help. This is purely academic and not practical at all.

[Tajin]

Ya, cause when i'm doing cryptography I want to contact a non-local third party site to get my "truly random" number to get it.
I'll pass

Fair enough, but they do have the source code though.

[divisortheory]

Ya, cause when i'm doing cryptography I want to contact a non-local third party site to get my "truly random" number to get it.
I'll pass

Fair enough, but they do have the source code though.

That's the point, lol. true random number generators are theoretically impossible with a software only approach. Therefore, what could this source code possibly do? The only way to have a piece of software generate truly random numbers is if that software communicates with a piece of hardware that actually does the work. This is what's happening here, it's contacting a network server, that network server has the hardware RNG attached to it, it generates numbers and sends the result back. So the source code is not very useful.

[Tajin]

Oh, well i havent download the source yet, a shame is not locally generated.

[Octavious]

Uh, d/dx means to take the derivative, not integrate....

yea...sorry about that...lol I realized that after I posted it, before I went to lunch. Was rushing through the work so I could go outside and relax for a bit during lunch (it's sunny for once, least for now anyway). I was being too lazy to edit before I left, lol sorry.

d/dx[7sin(7*x+?/2)+4cos(x -?2)]

d/dx[7sin(7*2?+?/2)+4cos(2? -?2)]

d/dx[7sin(14?+?/2)+4cos(3?/2)]

d/dx[7sin(27?/2) + 4cos(3?/2)]

I finished it when I went off to lunch since some of my previous work was erroneous, lol, so here's the rest.

d/dx[7sin(7*x+?/2)+4cos(x -?/2)]

= [7*cos(7*x+?/2)*(7*x+?/2)'+4*(-sin(x-?/2))*(x-?/2)']

= [7cos(7*x+?/2)*7+4(-sin(x-?/2))*(1)]

= [49cos(7*x+?/2)+4(-sin(x-?/2))]

|x=2?

= [49cos(14?+?/2)+4(-sin(2?-?/2))]

= [49cos(27?/2) + 4(-sin(3?/2))]

I don't feel like simplifying it more, mostly because no assignment I ever get makes me go further, lol. Whats great is when you hit a final/midterm and everyone who's never done the homework goes 'O.O I have to simplify it all out!?' There's always a few of those people in each calc class i took, lol.

It's been some time since then, the further I get into CS&E i miss my easier math classes. Everything seems to keep getting harder, so I have a hard time remembering the older material. Wish mah brain would get bigger, god knows i'd embaress myself on 'Are you smarter then a 5th grader' even though I swear I didn't learn half those questions in grade school >.> lol...

edit: fixed the sin/cos issue, apparently microsoft word is ghey when you type math in it...

[Semitry]

Swap the sin to cos and cos to -sin and you have it.

[Octavious]

Yea, I edit'd that. It turns out MS Word is really a pain when your trying to type math up. I think something auto corrected my grammar? Or spelling? I don't know, but I did it in a MS Word Doc then Copied it over, so if someone swapped over they'd see that I was working on something, lol, or least think so >.> ...lol

Gah, I hate doing math with my TI83+ and Paper, screw MS Word + PC Calculator, ugh >.<

[Jefe]

http://img175.imageshack.us/img175/4016/87312963vj5.jpg

http://img463.imageshack.us/img463/7572/25318558gn1.jpg

d/dx[7sin(3x + pi/2) + 3cos(6x) <----Use chain rule for angles

21cos(3x + pi/2) -18sin(6x)

replace x = pi; 21cos(3pi + pi/2) - 18 sin(6pi)

21cos (7pi/2) - 18 sin(6pi) = 0

Why did it fail to log though? 0_o; Meh, whatever.

[Octavious]

thats some crap, your math looks right (i'm checking it out on paper now from the copier lol), and they even said 'Congratulations You've Registered' ...wierd

[Not Kuno]

Math sucks. I'll use random.org for my random needs.