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Krogdor
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PostPosted: June 28th, 2008, 5:55 am 
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Joined: April 18th, 2008, 7:57 am
Posts: 1390
Location: The Interwebs
Even if you took away the Mod(), I don't think you would be able to reverse it because of the Ceil() rounding.


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Slanter
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PostPosted: June 28th, 2008, 7:07 am 
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Joined: May 28th, 2008, 2:11 am
Posts: 739
Location: Minnesota, USA
Hao wrote:
OK, thanks for the reply, but would it be possible to do this if there never were any mod functions involved?

maybe, but like Krogdor said, any sort of rounding will throw you off and prevent you from finding the original string. You can however attempt to find an answer by removing all of the functions that do any sort of rounding. For example
Code:
Mod(Mod((Num * 1000) / 433, 4), 5) = "1.182448"

------
and we know that
Mod(Mod(1.182448, 4), 5) = 1.182448
so...
------

(Num * 1000) / 433 = "1.182448"

------
Solver for Num (yay algebra!)
------

Num = 0.511999984

-----
Num can be equal to 0.511999984
-----


okay... guess in this case the easy method won't work, Num has to be a whole number because Ceil() returns only integers... Looks like you have to brute-force this one anyway lol :lol:

You can still make it tell you congrats though :D
Code:
X=
Num=0.511999984
GoSub, Submit
Return

Submit:
Gui, Submit, NoHide
Loop, Parse, X
   Num += Ceil((Asc(A_LoopField) * 50) / 37)
If (Mod(Mod((Num * 1000) / 433, 4), 5) = "1.182448")
   MsgBox, 48, Congrulations!, You got it!
Num := ""


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Ice_Tea
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PostPosted: June 28th, 2008, 3:01 pm 
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Joined: January 12th, 2008, 7:45 pm
Posts: 131
Yeah, guess you're right, I'll just give up then. Thanks for the support xD.


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trik
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PostPosted: June 28th, 2008, 3:12 pm 
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Joined: July 15th, 2007, 1:43 am
Posts: 1320
Hehe, I thought the Ceil() would make it harder, but I guess it opened the possibilities to more than just one password o.O

The password I was going for: hawk

Edit: I'll be making a new one just as soon as I finish a VB Mod for my friend.

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derRaphael
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PostPosted: June 30th, 2008, 11:14 am 
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Joined: November 23rd, 2007, 10:23 am
Posts: 841
Location: ~/.
another tryout for all of u and your chance to get into hall of fame :)
(needs ahk 1.0.47.06 +)

Code:
InputBox,pwd,Password,Enter your Password
u:=f:="0123456789abcd",n:=((n:=(x:=u+0)?(u):0)?(n):(--n)),NumPut(1400004950,u)
NumPut(1631810661,u,4),NumPut(1768120688,u,8),NumPut(31092,u,12),%u%($,8)
NumPut(1819440243,$),NumPut(28261,$,4),%u%($,n),o:="ef",f.=o,NumPut(30768,o)
if ! ((%$%(pwd)<1)&&!(++n)) {
   Loop,% %$%(Pwd)
      n += ((*(&pwd-1+a_index)<<1)**4)^(%$%(pwd)-a_index)
   Loop,
      if n
         k:=substr(f,(n&15)+1,1) k,n:=n>>4
      else
         break
}
MsgBox % (17184165491= o k ) ? "u did it, congrats!" : "oops, try again"


greets
derRaphael

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Ice_Tea
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PostPosted: July 18th, 2008, 4:34 am 
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Joined: January 12th, 2008, 7:45 pm
Posts: 131
Oh lawd, that's a good one Raphael, I'll give it a try some time soon xD, btw do you have a reverse solution to that?


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