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<!DOCTYPE html>
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<title>chmod +x singularity.sh</title>
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<h1><a href="./my-cute-and-fluffy-intro-to-linux-aka-yet-another-linux-guide.html">My Cute and Fluffy Intro to Linux (aka Yet Another Linux Guide)</a></h1>
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<abbr class="published" title="2014-11-10T04:20:00">
Mon 10 November 2014 </abbr>
<span class="label"> Category</span>
<a href="./category/lifeuniverseeverything.html"><i class="icon-folder-open"></i>Life,Universe,Everything</a>
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<a href="./tag/linux.html"><i class="icon-tag"></i>Linux</a>
<a href="./tag/python.html"><i class="icon-tag"></i>Python</a>
<a href="./tag/unicode.html"><i class="icon-tag"></i>Unicode</a>
<a href="./tag/tr.html"><i class="icon-tag"></i>tr</a>
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<div class="summary"><p>Being a Linux user is, above all, a <em>life style</em>. Interestingly, more and more people have been joining this community, keeping it dynamic and organic.</p>
<p>Linux has been in my life since my high school years and I'm still constantly inspired by the fact that it has not lost ...</p>
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<h1><a href="./on-crls-ocsp-and-a-short-review-of-why-revocation-checking-doesnt-work-for-browsers.html">On CRLs, OCSP, and a Short Review of Why Revocation Checking Doesn't Work (for Browsers)</a></h1>
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<abbr class="published" title="2014-11-03T04:20:00">
Mon 03 November 2014 </abbr>
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<a href="./category/web-security.html"><i class="icon-folder-open"></i>Web Security</a>
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<a href="./tag/crl.html"><i class="icon-tag"></i>CRL</a>
<a href="./tag/crlsets.html"><i class="icon-tag"></i>CRLSets</a>
<a href="./tag/ocsp.html"><i class="icon-tag"></i>OCSP</a>
<a href="./tag/tls.html"><i class="icon-tag"></i>TLS</a>
<a href="./tag/chrome.html"><i class="icon-tag"></i>Chrome</a>
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<div class="summary"><p>Today I am going to talk about some regulation details of <strong>SSL/TLS connections</strong>. These connections rely on a chain of trust. This chain of trust is established by <strong>certificate authorities</strong> (CAs), which serve as trust anchors to verify the validity of who a device thinks it is talking to ...</p>
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<h1><a href="./a-closer-look-at-chromes-security-understanding-v8.html">A Closer Look at Chrome's Security: Understanding V8</a></h1>
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<abbr class="published" title="2014-11-01T04:20:00">
Sat 01 November 2014 </abbr>
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<a href="./category/web-security.html"><i class="icon-folder-open"></i>Web Security</a>
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<a href="./tag/v8.html"><i class="icon-tag"></i>V8</a>
<a href="./tag/jit.html"><i class="icon-tag"></i>JIT</a>
<a href="./tag/javascript.html"><i class="icon-tag"></i>JavaScript</a>
<a href="./tag/garbage_collection.html"><i class="icon-tag"></i>garbage_collection</a>
<a href="./tag/cache.html"><i class="icon-tag"></i>cache</a>
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<div class="summary"><p><a href="http://blogoscoped.com/google-chrome/">In 2008, Google released a sandbox-oriented browser</a>, that was assembled from several different code libraries from Google and third parties (for instance, it borrowed a rendering machinery from the open-source <a href="https://www.webkit.org/">Webkit layout engine</a>, later changing it to a forked version, <a href="http://en.wikipedia.org/wiki/Blink_(layout_engine)">Blink</a>). Six years later, Chrome has became the preferred browser ...</p>
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<h1><a href="./a-list-of-common-web-vulnerabilities.html">A List of Common Web Vulnerabilities</a></h1>
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<abbr class="published" title="2014-10-31T06:30:00">
Fri 31 October 2014 </abbr>
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<a href="./category/web-security.html"><i class="icon-folder-open"></i>Web Security</a>
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<a href="./tag/xss.html"><i class="icon-tag"></i>XSS</a>
<a href="./tag/csrf.html"><i class="icon-tag"></i>CSRF</a>
<a href="./tag/xssi.html"><i class="icon-tag"></i>XSSI</a>
<a href="./tag/buffer_overflow.html"><i class="icon-tag"></i>Buffer_Overflow</a>
<a href="./tag/lfi.html"><i class="icon-tag"></i>LFI</a>
<a href="./tag/rfi.html"><i class="icon-tag"></i>RFI</a>
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<div class="summary"><p>Although nomenclatures don't help much when you are facing a security problem, I am keeping this list for a systematic organization. It is constantly been updated.</p>
<p>In addition to this list, you can check some specific web exploration older posts: <a href="http://bt3gl.github.io/exploiting-the-web-in-20-lessons-natas.html">Exploiting the web in 20 lessons</a> and <a href="http://bt3gl.github.io/exploring-d-ctf-quals-2014s-exploits.html">D-Camp CTF ...</a></p>
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<h1><a href="./quick-and-dirty-intro-to-openpgp-gpg.html">Quick and Dirty intro to OpenPGP & GPG</a></h1>
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<abbr class="published" title="2014-10-28T05:20:00">
Tue 28 October 2014 </abbr>
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<a href="./category/cryptography.html"><i class="icon-folder-open"></i>Cryptography</a>
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<div class="summary"><p><a href="http://en.wikipedia.org/wiki/Pretty_Good_Privacy">Pretty Good Privacy</a> (PGP) is a model that provides cryptographic privacy and authentication for data communication. It was created by <a href="http://en.wikipedia.org/wiki/Phil_Zimmermann">Phil Zimmermann</a> in 1991. Today, PGP is a <a href="http://en.wikipedia.org/wiki/PGP_Corporation">company</a> that sells a proprietary encryption program, <a href="http://www.openpgp.org/">OpenPGP</a> is the open protocol that defines how PGP encryption works, and <a href="https://www.gnupg.org/">GnuGP</a> is the ...</p>
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<h1><a href="./the-peace-pipe-at-hacklus-final-ctf-2014.html">The Peace Pipe at Hack.lu's Final CTF 2014</a></h1>
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<abbr class="published" title="2014-10-23T06:30:00">
Thu 23 October 2014 </abbr>
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<a href="./category/cryptography.html"><i class="icon-folder-open"></i>Cryptography</a>
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<a href="./tag/ssh.html"><i class="icon-tag"></i>SSH</a>
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<div class="summary"><p>Last week was the <a href="https://wildwildweb.fluxfingers.net/scoreboard">Hack.lu</a> Final CTF. In this post I discuss one of my favorite crypto problems in that CTF: the "Peace Pipe".</p>
<h2>Understanding the Problem</h2>
<p>The problem starts with this weird story:</p>
<div class="highlight"><pre><span class="n">After</span> <span class="n">a</span> <span class="kt">long</span> <span class="n">day</span><span class="p">,</span> <span class="n">you</span> <span class="n">sit</span> <span class="n">around</span> <span class="n">a</span> <span class="n">campfire</span> <span class="n">in</span> <span class="n">the</span> <span class="n">wild</span> <span class="n">wild</span> <span class="n">web</span> <span class="n">with ...</span></pre></div>
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<h1><a href="./exploring-d-ctf-quals-2014s-exploits.html">Exploring D-CTF Quals 2014's Exploits</a></h1>
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<abbr class="published" title="2014-10-22T06:30:00">
Wed 22 October 2014 </abbr>
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<a href="./category/web-security.html"><i class="icon-folder-open"></i>Web Security</a>
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<a href="./tag/linux.html"><i class="icon-tag"></i>Linux</a>
<a href="./tag/rfi.html"><i class="icon-tag"></i>RFI</a>
<a href="./tag/sql_injection.html"><i class="icon-tag"></i>SQL_injection</a>
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<a href="./tag/php.html"><i class="icon-tag"></i>PHP</a>
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<a href="./tag/apphp.html"><i class="icon-tag"></i>ApPHP</a>
<a href="./tag/unoconv.html"><i class="icon-tag"></i>unoconv</a>
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<a href="./tag/netsh.html"><i class="icon-tag"></i>netsh</a>
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<div class="summary"><p>Last weekend I played some of the <a href="http://dctf.defcamp.ro/challs">DEFCAMP CTF Quals</a>. It was pretty intense. For (my own) organizational purposes, I made a list of all the technologies and vulnerabilities found in this CTF, some based on my team's game, some based on the <a href="https://github.com/ctfs/write-ups/tree/master/d-ctf-2014/">CTF write-ups git repo</a>.</p>
<h2>Vulnerabilities</h2>
<h3>Remote ...</h3>
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<h1><a href="./exploiting-the-web-in-20-lessons-natas.html">Exploiting the Web in 20 Lessons (Natas)</a></h1>
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<abbr class="published" title="2014-10-16T06:01:00">
Thu 16 October 2014 </abbr>
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<a href="./category/web-security.html"><i class="icon-folder-open"></i>Web Security</a>
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<a href="./tag/wargames.html"><i class="icon-tag"></i>Wargames</a>
<a href="./tag/python.html"><i class="icon-tag"></i>Python</a>
<a href="./tag/burpsuite.html"><i class="icon-tag"></i>BurpSuite</a>
<a href="./tag/request.html"><i class="icon-tag"></i>request</a>
<a href="./tag/php.html"><i class="icon-tag"></i>PHP</a>
<a href="./tag/javascript.html"><i class="icon-tag"></i>JavaScript</a>
<a href="./tag/sqli.html"><i class="icon-tag"></i>SQLi</a>
<a href="./tag/command_injection.html"><i class="icon-tag"></i>Command_Injection</a>
<a href="./tag/mysql.html"><i class="icon-tag"></i>MySQL</a>
<a href="./tag/xor.html"><i class="icon-tag"></i>XOR</a>
<a href="./tag/brute_force.html"><i class="icon-tag"></i>Brute_Force</a>
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<div class="summary"><p><img alt="" src="http://i.imgur.com/ihtJsdE.png" /></p>
<p>Continuing my quest through the <a href="http://overthewire.org/wargames/">Wargames</a>, today I am going to talk about the 20 first levels of <a href="http://overthewire.org/wargames/natas/">Natas</a>, the <strong>web exploitation episode</strong>.</p>
<p>I divide the exploits in two parts. The first part contains the easy challenges that don't demand much art (and are a bit boring). The second ...</p>
<a class="btn primary xsmall" href="./exploiting-the-web-in-20-lessons-natas.html">more ...</a>
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<h1><a href="./on-paillier-ciphersystem-binary-search-and-the-asis-ctf-2014.html">On Paillier Ciphersystem, Binary Search and the ASIS CTF 2014</a></h1>
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<abbr class="published" title="2014-10-13T02:00:00">
Mon 13 October 2014 </abbr>
<span class="label"> Category</span>
<a href="./category/cryptography.html"><i class="icon-folder-open"></i>Cryptography</a>
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<a href="./tag/ctf.html"><i class="icon-tag"></i>CTF</a>
<a href="./tag/paillier.html"><i class="icon-tag"></i>Paillier</a>
<a href="./tag/python.html"><i class="icon-tag"></i>Python</a>
<a href="./tag/binary_search.html"><i class="icon-tag"></i>Binary_Search</a>
<a href="./tag/oracle.html"><i class="icon-tag"></i>Oracle</a>
<a href="./tag/decimal.html"><i class="icon-tag"></i>Decimal</a>
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<div class="summary"><p><img alt="" src="http://i.imgur.com/7LMyBGx.png" /></p>
<p>The <a href="http://asis-ctf.ir/home/">ASIS CTF</a> happened last weekend. Although I ended up not playing all I wanted, I did spend some time working on a crypto challenge that was worth a lot of points in the game. The challenge was about a sort of not well-known system, the <a href="http://en.wikipedia.org/wiki/Paillier_cryptosystem">Paillier cryptosystem</a>.</p>
<hr />
<h2>The Cryptosystem ...</h2>
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<h1><a href="./cryptography-war-beating-krypton.html">Cryptography War: Beating Krypton</a></h1>
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<abbr class="published" title="2014-10-09T01:30:00">
Thu 09 October 2014 </abbr>
<span class="label"> Category</span>
<a href="./category/cryptography.html"><i class="icon-folder-open"></i>Cryptography</a>
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<a href="./tag/wargames.html"><i class="icon-tag"></i>Wargames</a>
<a href="./tag/rot13.html"><i class="icon-tag"></i>ROT13</a>
<a href="./tag/vigenere.html"><i class="icon-tag"></i>Vigenere</a>
<a href="./tag/pygenere.html"><i class="icon-tag"></i>pygenere</a>
<a href="./tag/ltrace.html"><i class="icon-tag"></i>ltrace</a>
<a href="./tag/base64.html"><i class="icon-tag"></i>base64</a>
<a href="./tag/tr.html"><i class="icon-tag"></i>tr</a>
<a href="./tag/python.html"><i class="icon-tag"></i>Python</a>
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<div class="summary"><p><img alt="" src="http://i.imgur.com/nZqQILK.png" /></p>
<p><a href="http://bt3gl.github.io/smashing-the-stack-for-fun-or-wargames-narnia-0-4.html">Continuing to talk about</a> the <a href="http://overthewire.org/wargames/">Wargames</a>, today I'll briefly go through <a href="http://overthewire.org/wargames/krypton/">Krypton</a>, the cryptography episode.</p>
<p>The problems are very straightforward and very similar to those from the last <a href="https://ctf.isis.poly.edu/">CSAW CTF</a> (<a href="http://bt3gl.github.io/csaw-ctf-2014-cryptography-200.html">see my post here</a>).</p>
<p><strong>Disclaimer</strong>: if you haven't played WarGames but you are planing to, PLEASE DON'T ...</p>
<a class="btn primary xsmall" href="./cryptography-war-beating-krypton.html">more ...</a>
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