Rainbow Table and srand (), i need help please.

This is a discussion on Rainbow Table and srand (), i need help please. within the Game Programming forums, part of the General Programming Boards category; Ok, I am playing a game and let say that i want to upgrade my gear by linking items in ...

  1. #1
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    Nov 2011

    Rainbow Table and srand (), i need help please.

    Ok, I am playing a game and let say that i want to upgrade my gear by linking items in it. The items give you a 22% linking chance. I know that in order to link i need numbers lower than 22000/100000. I know that anything under 22000 can be linked. In order to know at what time i can get a number under 22000 i need to use a rainbow table to get a timeframe and put it in the srand(). This is a guy trying to explain me how to do it, but since i do not know anything about the Rainbow table i cannot manage to do it.

    tell him this: srand(time) % 10000, you need the results of that mapped out into a rainbow table

    for a timeframe

    you used this

    #include <stdlib.h>
    #include <stdio.h>
    #include <time.h>
    int main(void)
    int i;
    time_t t;
    srand((unsigned) time(&t));
    for(i=0; i<10; i++)
    printf("%d\n", rand() % 100);
    return 0;
    but you're thinking about it the wrong way
    you will never be accurate enough trying it like that
    You just want to output the results of srand()

    Timestamp is just a really long number
    and it's sequential

    so, you can.... predict what... 12/2/2011 11:32:10 PM would be
    in a timestamp format

    Now, if XXX game's RNG runs off the timestamp of the current time...
    you can predict what it will generate
    at 12/2/2011 11:32:10 PM
    in the future.

    So, a rainbow table just basically lists "all" the possible outcomes. I do 7 hours worth of times in my rainbow tables

    Then I look for groups of time periods where linking % is high

    because you just can't get accurate enough to know what exact server time is + the lag

    So, you want to feed srand() with future times and map them out into a spreadsheet (excel or something)

    Just small periods of time, then look at allllll the numbers under 22,000

    because those are the ones that will link.
    Or %%,000. whatever % it is

    22,000 = 22%, etc.

    and make a table with srand() outputs

    then try to find a big group of low numbers

    You want about... 2-3 seconds where 80% of the numbers are under your desired linking %. It's not hard to find if you have the output in front of you

    Here are steps
    1) pick day you want to link
    2) find a 10-20 minute time period, predict their unix timestamps (just calculate, google it )
    3) feed all those unix timestamps into srand() in order
    4) save srand's output into CSV or some kind of output you can read
    5) evaluate for 2-3 seconds of low numbers
    ^--- linking in a nutshell

    I know this is a little be complicated but i hope any of you know, what i am trying to accomplish here.

  2. #2
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