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by fido2509
Fri Aug 21, 2009 10:15 am
Forum: Challenges Solved
Topic: Fuzzy Dust
Replies: 2
Views: 2026

Fuzzy Dust

Sweet little challenge

Took me a while to notice that the file is too big for such a "small" image.
The rest was easy

Thanks to the creator
by fido2509
Thu Aug 20, 2009 12:32 pm
Forum: Challenges Solved
Topic: Patience
Replies: 10
Views: 2061

I solved this one quickly by doing some little math: f(0) = l f(k) = 2*f(k-1)+1 => f(k) = pow(2, k)*l + (pow(2, k) - 1) with f(20000) % 1000000000 = "843997183" That way I implemented a class which solved the challenge within seconds. import java.math.BigInteger; import java.util.Random; p...
by fido2509
Tue Aug 04, 2009 9:41 am
Forum: Challenges
Topic: Didactic XOR Cipher 3
Replies: 35
Views: 69051

Hi nighthalk,

I couldn't find junk bytes, so your answer is no.

Cool idea to solve the challenge in ASM, but maybe you should rethink algorithm.
So far I can tell there's a small bug in your code.
And there's still potential to increase performance.

Fido
by fido2509
Sat Aug 01, 2009 3:06 pm
Forum: Challenges Solved
Topic: Make money fast
Replies: 4
Views: 2357

Make money fast

I don't know how the cipher works but spammimic told me the solution. ;)

Cool challenge although I still don't know how it works.


Fido
by fido2509
Sat Aug 01, 2009 12:14 am
Forum: The Hacker's Server
Topic: Forum search problem
Replies: 3
Views: 5912

Searching on your username only returns this topic for me. And given the fact your postcount is currently at 5, it's not that much of a surprise you only got 4 results, prior to posting this.. Yeah, and with this posting it's 6, but my point was, that there where no topics listed. I just recieved t...
by fido2509
Fri Jul 31, 2009 8:56 am
Forum: The Hacker's Server
Topic: Forum search problem
Replies: 3
Views: 5912

Forum search problem

Hi, I recently wanted to see whether my posts where answered, so I searched for author "fido2509" (leaving all the other options untouched). The result page told me 4 results (yeah, I write not too often, but there should be more than 4). BUT no results where shown, just a "4 results&...
by fido2509
Thu Jul 23, 2009 6:42 pm
Forum: Challenges Solved
Topic: Branches
Replies: 10
Views: 4297

I wrote a code optimizing script in PHP to reduce the decompiled Java Code to those 3 functions. The reduction was simply a writing inplace, meaning instead of "return aS(l10)" "return <Code of aS>". Doing that with correctly replacing the arguments, the code reduces from 120 kB ...
by fido2509
Wed Jul 22, 2009 8:38 am
Forum: Challenges Solved
Topic: Lazy Maze
Replies: 26
Views: 3067

Hi, I solved the maze manually with some support of pen and paper. That way I chose because the server didn't answer correctly on my requests. I used PHP with fsockopen(..). I included cookies, referer, user-agent, accept-encoding and all the headerlines firefox uses too. But instead of "keep w...
by fido2509
Fri Jul 17, 2009 6:42 pm
Forum: Challenges Solved
Topic: Breakout
Replies: 35
Views: 4657

I played it to the second stage and got bored, so I reversed the code using jad and eclipse Reading the code a little I noticed the keyDown handler. Reading further I got a methode that checks whether the entered char sequence is a secret code. I ran the methode to get a list of codes then sequencel...
by fido2509
Fri Jul 17, 2009 11:45 am
Forum: Challenges Solved
Topic: UpCount
Replies: 28
Views: 6527

I don't like java, so I translated the code to PHP:

Code: Select all

function calc($depth) {
	if ($depth == 0) return 1;
	$cc = calc($depth - 1);
	return (double)$cc + ($depth % 7) + (((($cc ^ $depth) % 4) == 0) ? 1 : 0); 
}
echo calc(11589);
Didn't take more than 1 minute to translate and run ;)

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