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sleepsleep

Joined: 05 Oct 2006
Posts: 8885
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sleepsleep
interesting, seems like collision is a matter of time,

maths should be teach in ssuch a way that the student desire to figure out an answer for a question and use his whole life time to seek. =)
18 Dec 2013, 21:18
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17270
revolution
A collision is guaranteed by simply hashing enough inputs. But reaching 100% coverage of outputs is still an open question.
18 Dec 2013, 21:37
sleepsleep

Joined: 05 Oct 2006
Posts: 8885
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sleepsleep
revolution wrote:
A collision is guaranteed by simply hashing enough inputs. But reaching 100% coverage of outputs is still an open question.

interesting,
19 Dec 2013, 04:30
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17270
revolution
2^256+1 hashes guarantees at least one collision. There is nothing new or unexpected in that. Same thing with birthdays, with 367 people in a room there is guaranteed at least one duplicate.

Perhaps a bit surprising is that with only 23 randomly selected people in a room there is p~=0.5 chance of a duplicate birthday. Collisions are not hard to generate, it just needs enough samples.
19 Dec 2013, 04:47
tthsqe

Joined: 20 May 2009
Posts: 724
tthsqe
Here is an interesting question:
Suppose I give you 1000 random integers from 1 to 1000 with equal probability. How many DISTINCT numbers do you expect to have? Then do this problem with the first 1000 replaced by m and the second 1000 replaced by n.

19 Dec 2013, 05:21
tthsqe

Joined: 20 May 2009
Posts: 724
tthsqe
Just to clarify, the expected value when m=n=20 is exactly 12.83028155182915531285179119110107421875. Now, I generate 20 random numbers, each between 1 and 20:
13, 19, 11, 18, 16, 7, 18, 13, 14, 20, 1, 9, 8, 7, 15, 6, 1, 2, 17, 13
there are 15 distinct values, which is close to the expected value of 12.8.
19 Dec 2013, 18:36
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
sorry, i couldn't grab what you are presenting tthsqe, if you don't mind, is that possible to simplify the question? or answer?

and how is that to define random?

1 to 1000, if 5 shows up 10 times, 108 shows up 10 times, or a number shows up 20 times or more, is there a maximum picked count value impose on random generated numbers.

good random and bad random, is there a line?
20 Dec 2013, 15:10
baldr

Joined: 19 Mar 2008
Posts: 1651
baldr
sleepsleep,

Let's take a 20-sided dice and throw it 20 times, placing a mark on a side that faces up each time. Note the final number of marked faces. Wash, rinse and repeat until tired. An average of those numbers noted is the expected value, approximately.
20 Dec 2013, 16:13
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
so random conform to a balance distribution of each number?

if let say the average from distinct chosen numbers are something we could "expected", how is that the "way" to generate random is random?
20 Dec 2013, 17:12
tthsqe

Joined: 20 May 2009
Posts: 724
tthsqe
ok, let me make it more precise. baldr has the correct idea.
Code:
```E(n,m):
rand(n): gives a random integer between 1 and n with each integer chosen with  equal probability.
now, initialize the array L with n zeros
repeat m times
L[rand(n)] = 1
end repeat
return L[1] + L[2] + ... + L[n]    ```
Your goal is to determine an exact formula for the expected value E(n,m) of the number of distinct values returned by m trials on rand(n). The formula will be in terms of n and m.
20 Dec 2013, 21:24
Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA
Tyler
Did anyone notice BTC going to \$1250 in November? They're still way about \$130.
21 Dec 2013, 03:14
HaHaAnonymous

Joined: 02 Dec 2012
Posts: 1180
Location: Unknown
HaHaAnonymous
[ Post removed by author. ]

Last edited by HaHaAnonymous on 28 Feb 2015, 19:00; edited 1 time in total
21 Dec 2013, 04:03
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17270
revolution
HaHaAnonymous wrote:
Can US government stop Bitcoin?
Perhaps. I suppose they could buy them all. I can't see any other way to stop it unless everyone just loses confidence and it dies naturally.
21 Dec 2013, 04:06
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
Quote:
Did anyone notice BTC going to \$1250 in November?

notice that,
1 BTC around USD 630 now, which is still pretty high,

maybe the best thing to do now is mining litecoin and sell them in some future.
21 Dec 2013, 17:47
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
i am trying cudaminer and cpu miner (minerd),

low khash rate =( with -a scrypt, i aim for litecoin.

if to choose, which one logically better? 32 or 64 bit miner program?

minerd.exe around 368 KB,
21 Dec 2013, 20:25
HaHaAnonymous

Joined: 02 Dec 2012
Posts: 1180
Location: Unknown
HaHaAnonymous
[ Post removed by author. ]

Last edited by HaHaAnonymous on 28 Feb 2015, 19:00; edited 1 time in total
21 Dec 2013, 20:35
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
it seems to me, bitcoin is no longer worth mining, they use fast asic sha256 machines,

i am thinking abuot getting r280x,

using G2020 cpuminer rightnow, i got around 15 khash/s (since this machine always on, i just make it do some extra job)
21 Dec 2013, 20:39
HaHaAnonymous

Joined: 02 Dec 2012
Posts: 1180
Location: Unknown
HaHaAnonymous
[ Post removed by author. ]

Last edited by HaHaAnonymous on 28 Feb 2015, 18:59; edited 1 time in total
21 Dec 2013, 21:08
sleepsleep

Joined: 05 Oct 2006
Posts: 8885
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sleepsleep
HaHaAnonymous wrote:

Hmm, just realized this thing is not for me.

in what sense?
electricity cost?

scrypt coin is probably more value in long term atm,

/me waiting for new coin that maybe with following features.
- coins mined or purchased must be used in 1 year time start from date mined, after that, those coins would get retired and possible to be mined by others after the end of total coins distributed.

- 2 kinds of wallet, BUYER wallet and SELLER wallet,
mined coin are put inside BUYER wallet
1 spend money only, 1 accept money

- promote, BUYER -> SELLER relationship and prevent middleman, coin could be used twice only, BUYER mined and spend to buy stuff directly from SELLER, buyer wallet to seller wallet

- algo will balance global BUYER & SELLER wallet,
eg. if global BUYER wallet market = SSC (sleepsleep coin) 567,000 million
and SELLER wallet market = SSC 760,000 million,

this mean, no purchase are allow anymore from buyer wallet to seller wallet, the money in anytime must somehow balance with +- 10 percent. so seller must spend the money back on buyer wallet.

- coins distributed in a way that prevent asic based mining,

- a maximum khash/s is imposed

- program live and distribute inside mining block, (something like virtual program)

- programmer would get added advantage for more efficient ideas, algo and etc

sounds like communism coins?
22 Dec 2013, 03:10
HaHaAnonymous

Joined: 02 Dec 2012
Posts: 1180
Location: Unknown
HaHaAnonymous
[ Post removed by author. ]

Last edited by HaHaAnonymous on 28 Feb 2015, 18:56; edited 1 time in total
22 Dec 2013, 05:31
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