Une liste non exhaustive des différentes communautés actuelles de sécu, certaines ont des challenges à vous proposer.
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http://www.defcon.org
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http://www.hackthissite.org
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http://www.hackerscenter.com
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http://www.thehackernews.com
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http://www.soldierx.com
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http://www.i-hacked.com
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http://www.zenk-security.com
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http://hwc-crew.org
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http://www.europasecurity.org/forum.php
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http://hackbbs.org
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http://www.infomirmo.fr
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http://www.newbiecontest.org
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http://root-me.org
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http://w3challs.com
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http://www.microcontest.com
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http://www.hackerzvoice.net/phpBB3/
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http://www.overthewire.org
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http://www.bjornulf.fr/forum/
[EDITED BY KHALED]
Extraction de la liste de http://wechall.net/ a écrit :<div><a href="http://www.hackquest.com" title="Ranked">HackQuest</a></div>
<div><a href="http://www.wechall.net/" title="Ranked">WeChall</a></div>
<div><a href="http://www.bright-shadows.net" title="Ranked">TheBlackSheep</a></div>
<div><a href="http://www.rankk.org" title="Ranked">Rankk</a></div>
<div><a href="http://www.caesum.com/game" title="Ranked">Electrica</a></div>
<div><a href="http://www.happy-security.de" title="Ranked">Happy-Security</a></div>
<div><a href="http://www.newbiecontest.org" title="Ranked">NewbieContest</a></div>
<div><a href="http://www.dareyourmind.net" title="Ranked">DareYourMind</a></div>
<div><a href="http://www.lost-chall.org" title="Ranked">LOST-Chall</a></div>
<div><a href="http://www.yashira.org" title="Ranked">Yashira</a></div>
<div><a href="http://www.infomirmo.fr" title="Ranked">infomirmo</a></div>
<div><a href="http://www.brainquest.sk" title="Ranked">BrainQuest</a></div>
<div><a href="http://www.net-force.nl" title="Ranked">Net-Force</a></div>
<div><a href="http://www.hackthissite.org" title="Ranked">HackThisSite</a></div>
<div><a href="http://thisislegal.com" title="Ranked">ThisIsLegal</a></div>
<div><a href="http://warzone.elhacker.net" title="Ranked">elhacker.net</a></div>
<div><a href="http://www.trythis0ne.com" title="Ranked">TryThis0ne</a></div>
<div><a href="http://www.tdhack.com" title="Ranked">TDHack</a></div>
<div><a href="http://www.mibs-challenges.de" title="Ranked">MiBs Challenges</a></div>
<div><a href="http://3564020356.org" title="Ranked">+Ma's Reversing</a></div>
<div><a href="http://phmaster.info" title="Ranked">PHMaster</a></div>
<div><a href="http://hack.thebackupbox.net/cgi-bin/pageview.cgi" title="Ranked">thebackupbox</a></div>
<div><a href="http://hax.tor.hu" title="Ranked">hax.tor.hu</a></div>
<div><a href="http://www.hacker.org" title="Ranked">Hacker.org</a></div>
<div><a href="http://www.osix.net" title="Ranked">osix</a></div>
<div><a href="http://www.javaist.com/rosecode" title="Ranked">Rosecode</a></div>
<div><a href="http://www.cstutoringcenter.com" title="Ranked">CSTutoringCenter</a></div>
<div><a href="http://listbrain.awardspace.biz" title="Ranked">listbrain.tk</a></div>
<div><a href="http://www.astalavista.com" title="Ranked">Astalavista</a></div>
<div><a href="http://www.tools-and-design.com" title="Ranked">Tools & Design</a></div>
<div><a href="http://hackbbs.org" title="Ranked">HackBBS</a></div>
<div><a href="http://securitytraps.no-ip.org/" title="Ranked">Security Traps</a></div>
<div><a href="http://www.root-me.org" title="Ranked">Root-Me</a></div>
<div><a href="http://www.spoj.pl" title="Ranked">SPOJ</a></div>
<div><a href="http://sabrefilms.co.uk/revolutionelite" title="Ranked">Revolution Elite</a></div>
<div><a href="http://w3challs.com/" title="Ranked">W3Challs</a></div>
<div><a href="http://gekko.csokavar.hu" title="Ranked">Gekkó</a></div>
<div><a href="http://webhacking.kr" title="Ranked">Webhacking.kr</a></div>
<div><a href="http://www.microcontest.com" title="Ranked">µContest</a></div>
<div><a href="http://www.enigmagroup.org" title="Ranked">EnigmaGroup</a></div>
<div><a href="http://hack-me.org" title="Ranked">Hack-Me</a></div>
<div><a href="http://www.right-answer.net" title="Ranked">Right-Answer</a></div>
<div><a href="http://www.wargame.kr" title="Ranked">wargame.kr</a></div>
<div><a href="http://securityoverride.org" title="Ranked">Security Override</a></div>
<div><a href="http://halls-of-valhalla.org" title="Ranked">Valhalla</a></div>
<div><a href="http://hacking.allowed.org" title="Ranked">hacking.allowed</a></div>
<div><a href="http://reversing.kr" title="Ranked">Reversing.Kr</a></div>
<div><a href="http://suninatas.com" title="Ranked">SuNiNaTaS</a></div>
<div><a href="http://yoire.com" title="Ranked">yoire</a></div>
<div><a href="http://www.wixxerd.com" title="Ranked">wixxerd.com</a></div>
[les sites des utilisateurs]
https://www.hacking-lab.com/caselist/
http://www.mod-x.co.uk/main.php
http://www.orgasm.re/
http://www.enigmagroup.org/
http://ghost-sec.fr/forum/
http://hacker.yakuza112.org/
N'hésitez pas à faire part d'autres sites que vous connaissez qui pourrait rentrer dans cette liste.