c100 – Carnivore

c100 - Carnivore

<blockquote> <p id="pergunta" style="text-align: justify">Read the file!</p> </blockquote> &nbsp; <h2>Solução</h2> <p style="text-align: justify">Baixe o arquivo .tar.gz e descompacte.</p> <pre class="lang:default decode:true ">$ tar -vzxf 73d347e21d1d5b41167b1d770110fea5.tar.gz</pre> Trate se de um arquivo texto. <p style="text-align: justify">Vamos analisar o arquivo com o HexEditor:</p> <pre class="lang:default decode:true ">$ hexeditor c100.txt</pre> <a href="http://ctf-br.org/wp-content/uploads/2014/12/c100.jpg"><img class="alignnone size-large wp-image-398" src="http://ctf-br.org/wp-content/uploads/2014/12/c100-1024x667.jpg" alt="c100" width="604" height="393" /></a> Logo vemos um texto formado por apenas 20 e 09. Convertendo para binário o "20" em "0" e "09" em "1" Obtemos o seguinte binário: 0 1 0 0 1 1 1 1 0 0 1 0 0 0 0 0 0 1 1 0 0 0 1 1 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 0 0 1 1 0 1 1 1 0 0 1 1 0 1 0 0 1 0 1 1 1 0 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 0 0 1 0 0 1 1 0 0 1 0 1 0 0 1 0 0 0 0 0 1 1 0 0 0 0 1 1 1 0 1 0 1 0 0 1 0 0 1 0 0 0 0 0 0 1 1 0 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 0 1 0 0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 1 1 1 0 0 1 0 0 0 0 0 0 1 1 0 1 1 0 0 0 1 1 0 1 0 0 1 0 1 1 0 1 1 0 1 0 1 1 0 1 0 0 1 0 1 1 1 0 1 0 0 0 1 1 0 0 0 0 1 0 1 1 0 0 1 0 0 0 1 1 0 1 1 1 1 0 0 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 1 1 1 0 0 1 0 0 1 1 0 0 1 0 1 0 1 1 0 0 0 1 1 0 1 1 0 1 0 0 1 0 1 1 1 0 0 1 1 0 1 1 0 0 0 0 1 0 1 1 0 1 1 0 1 0 1 1 0 1 1 1 1 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 1 1 0 1 1 0 1 0 1 1 0 1 1 1 1 0 1 1 0 1 1 1 0 0 1 1 0 1 0 0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 1 1 1 0 1 1 1 0 0 1 0 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 0 0 0 0 0 1 0 1 0 0 1 1 0 1 1 1 0 1 1 0 0 0 0 1 1 1 0 1 0 0 0 1 1 0 1 1 0 1 1 1 1 0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 1 0 1 1 1 0 0 0 0 0 1 1 0 0 1 0 1 0 1 1 0 1 1 1 0 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 1 1 0 0 0 1 1 0 1 1 0 1 1 1 1 0 1 1 0 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 0 1 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 0 0 1 1 0 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 1 0 0 1 1 1 1 1 0 0 0 0 1 1 1 0 1 1 0 1 0 1 0 1 1 0 0 1 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 1 1 0 0 1 0 0 0 1 1 0 0 1 0 1 0 0 1 0 0 0 0 0 0 1 1 0 0 1 0 0 0 1 1 0 0 0 0 1 0 1 1 0 0 1 0 0 0 1 1 0 1 1 1 1 0 1 1 1 0 0 1 1 0 0 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 1 1 0 1 1 0 1 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 1 0 0 0 0 1 0 1 0 0 1 1 1 0 1 0 0 0 1 1 0 0 1 0 1 0 1 1 0 1 1 0 0 0 1 1 0 0 1 0 1 0 1 1 0 0 1 1 0 1 1 0 0 0 0 1 1 1 0 1 1 0 1 0 0 0 1 1 0 1 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 0 0 1 1 0 1 1 0 0 0 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 1 1 1 0 1 0 0 0 1 1 0 0 0 0 1 0 1 1 0 1 1 0 1 0 1 1 0 0 0 1 0 1 1 0 0 0 0 1 1 1 0 1 0 1 0 0 1 0 1 1 0 1 1 0 1 0 0 1 0 1 1 1 0 0 0 0 0 1 0 1 0 0 0 0 0 1 0 10 Convertendo o binário para ascii obtemos a flag. <h3>Flag</h3> <code>O carnivore é muito limitado, precisamos monitorar não apenas as comunicações de dados, mas as telefônicas também.</code> <h3>Criado por</h3> XShellCTF <h3></h3>