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quangntenemy

Avatar: 14557 2011-10-31 11:07:55 -0400
59

[WeChall]

Level 69 Troll

:ronpaul: :****ing sucks:

OK now that the contest is over I would like to add a side note Log in to see images!
The Vigenere cipher part in challenge 7 and 9 can alternatively be cracked with cryptanalysis without the need of a key. There is an algorithm invented by Kasisky to determine the key length. After that you can either use frequency analysis or known plaintext attack. Normally the ciphertext should be arranged in group of 5, but here it isn’t so plaintext guessing is easier. And there are even automatic programs that can help you.
If you go to http://smurfoncrack.com/pygenere/index.php and put challenge 9 in there with a key length of 6 you’ll get the text decrypted in no time
Now some of you asked for challenge sites like this, and I would like to introduce some
– TheBlackSheep at http://www.bright-shadows.net – this site has a lot of challenges in various categories, you can learn a lot from there.
http://www.hackquest.de – your journey in the hacker world.
http://www.net-force.nl – a Dutch challenge site, but the content is mostly in English.
– The Pyramid at http://www.rankk.org – solve the challenges, climb the pyramid and become a Geb.
– Electrica at http://www.caesum.com/game – a fun and tough challenge site.
– Ma’s Reversing at http://www.3564020356.org – one of the first challenge site, mostly about cryptography, steganography and reverse engineering.
http://www.mod-x.co.uk – a level-based challenge site, you are an agent and completing the “hack” mission will take you to glory
– Many more that you can find from http://www.hackergames.ne , or my homepage http://www.freewebs.com/quangntenemy/
– And don’t forget to visit http://www.wechall.ne , the universal challenger tracker. Eventually all challenge sites will meet up in there.
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