C++ Password Seed

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Originally Posted by Mr_PoP well this one works : Code: //random seed void rPassSeed(char *seed) { srand ( time(NULL) ); char k[8]; for (int i=0;i<8;i++) { k[i]=rand()%10; } sprintf(seed,"%d%d%d%d%d%d%d%d",k[0],k[1],k[2],k[3],k[4],k[5],k[6],k[7]); }

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Originally Posted by unknownone Again, you can't just use any random numbers. You must use the specific ones produced by rand(), otherwise the client and the server are not going to have the same cryptography. The psuedo-random numbers are used such that the server and client will always produce the same result, and thus be able to decrypt/encrypt the password. Ok, perhaps I misread. You're referring to what value you can put into the seed packet: In that case, anything. But you must then use that same value in your call to srand() to seed your RC5.

void r(char *w)
{
	char k[8];
	for (int i=0;i<8;i++)
	{
		k[i]=rand()%10;
	}
	sprintf(w,"%d%d%d%d%d%d%d%d",k[0],k[1],k[2],k[3],k[4],k[5],k[6],k[7]);
}

int main()
{
	char test[9];
	r(test);
	cout << test;
}

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Originally Posted by Basser You realize there is no such thing as random in whatever programming language?

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Originally Posted by _tao4229_ False. [Only registered and activated users can see links. Click Here To Register...]

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Originally Posted by bone-you False. There are no random numbers in computing. The numbers are all coming from something. When I ask you to give me a random number from your head, you will just think of a random number. The source of that number is nothing. If you ask a computer to generate a random number, it cannot give you a number based on nothing. It must either pull a piece of memory or do some calculations. Both are subject to the flaw that if that section of memory is the same for each consecutive call, it will give the same random number. Also, if the seed given for the calculations is the same, it will give the same random number. There is no truly random to computers. If I say 4,5,6,7,2,5,1,5,7,5,4,1,8,1,1,6,1, that was completely random. There was no basis to them. I just looked away and pressed random keys. Because air friction, movement of my body, etc, is never the same for each press, it truly is random as the same exact conditions would never happen again. tl;dr, computers can't generate random numbers.

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Originally Posted by unknownone Some would argue that nothing in the universe is random. Humans certainly aren't - you can program them as easily as any computer if you control what information goes in.

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Originally Posted by _tao4229_ Measurement in quantum mechanics - Wikipedia, the free encyclopedia tl;dr, generates randomness just like the universe and us. you're getting trolled.

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The measurement process is often said to be random and indeterministic. (However, there is considerable dispute over this issue; in some interpretations of quantum mechanics, the result merely appears random and indeterministic, in other interpretations the indeterminism is core and irreducible.) This because an important aspect of measurement is wavefunction collapse, the nature of which varies according to the interpretation adopted.