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---
title: MitM
slug: Glossary/MitM
tags:
- Glossário
- Segurança
translation_of: Glossary/MitM
original_slug: Glossário/MitM
---
<p>Um <strong>Ataque Man-in-the-middle </strong>(MitM) interceta uma comunicação entre dois sistemas. Por exemplo, um roteador Wi-Fi pode estar comprometido.</p>
<p>Comparando isto com o correio físico: se estiverem a escrever cartas para cada um, o carteiro pode intercetar cada carta que manda. Eles abrem-na, lêem-na, eventualmente modificam-na, e depois colocam-na numa carta e só então é que a enviam para o seu destinatário . O recipiente original então responderia à carta, e o carteiro abriria-a novamente, lia-a, eventualmente modificava-a, colocava-a num envelope, e a entregaria a si. Não saberia que exisite um "homem no meio" no seu canal de comunicação – o carteiro é invisível para si e para o seu recipiente.</p>
<p>No correio físico e na comunicação on-line, os ataques MITM são difíceis de defender. Algumas dicas:</p>
<ul>
<li>Não ignore apenas os avisos de certificado. Pode estar a ligar-se a um servidor de <em>phishing</em> ou um a servidor impostor.</li>
<li>Os sites sensíveis sem encriptação HTTPS nas redes de Wi-Fi públicas não são confiáveis.</li>
<li>Veja se tem <strong>HTTPS</strong> na sua barra de endereço e assegure que a encriptação está ativada antes iniciar a sessão.</li>
</ul>
<div>
<h2 id="Saber_mais">Saber mais</h2>
<ul>
<li>OWASP - Artigo: ataque <a href="https://www.owasp.org/index.php/Man-in-the-middle_attack">ataque Man-in-the-middle</a> (inglês)</li>
<li>Wikipedia: <a href="https://pt.wikipedia.org/wiki/Ataque_man-in-the-middle">Ataque Man-in-the-middle</a></li>
<li>O cabeçalho {{HTTPHeader("Public-Key-Pins")}} ({{Glossary("HPKP")}}) pode reduzir significativamente o risco de MITM, instruindo os navegadores para solicitarem um certificado na 'lista branca' para todas as ligações subseqüentes àquele site da Web.</li>
</ul>
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