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+---
+title: Verificando la autenticidad usando contraseña
+slug: Web/API/Web_Crypto_API/Checking_authenticity_with_password
+translation_of: Web/API/Web_Crypto_API/Checking_authenticity_with_password
+---
+<p>{{APIRef("Web Crypto API")}}{{draft}}</p>
+
+<p>La autenticidad del mensaje puede ser verificada usando el API Crypto Web. En este artículo mostrarémos como crear y controlar una firma digital utilizando una contraseña y una función hash.</p>
+
+<p>Un algoritmo HMAC toma una llave y genera un código digerido de la llave y los datos a firmar. Posteriormente, cualquiera con la llave puede volver a generar el mismo código digerido para verificar si los datos han sido alterados.  Además, mediante el conocimiento de una clave secreta, permite almacenar juntos el código digerido y los datos: un atacante no podrá generar un código digerido sobre datos manipulados si no conoce la clave secreta.</p>
+
+<p>Note that this algorithm doesn't carry any information about the person owning the data, nor its unicity: the mere knowledge of the key is enough to alter the data.</p>
+
+<p>Let's assume that the data is stored on the computer. To access it, both for writing and reading, we will use <code>localforage.js</code> a small library wrapping the different storages capabilities of a browser in the same interface. This library is not an essential component of this use case and is used here for convenience, to keep focused on what really matter, the cryptographic part.</p>
+
+<p>The data we want to access is of the form:</p>
+
+<p> </p>
+
+<p>where <code>data</code><em> </em>is the information to guarantee the integrity and <code>signature</code> the information used to verify it.</p>
+
+<p>Cryptographic keys can't be remembered by heart by human, and passwords, or passphrases, make bad, that is unsecure, cryptographic key. To solve this problem, cryptographers have designed algorithms generating cryptographically-sound keys from password. Knowing the password allowed to regenerate the same key and to use it.</p>
+
+<p>We ask the user for a password, and we use it to generate the key:</p>
+
+<pre> </pre>
+
+<p>With that key, we will be able to compute the <em>mac</em> of the data.</p>
+
+<pre> </pre>