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steghide-tutorial #60

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<h3><b>Changing the encryption</b></h3>
<p>As you've seen, steghide needs a passphrase to embed and extract data. (Note: using an empty passphrase can lead to issues extracting.) This passphrase is used to both encrypt your file before embedding and to seed the PRNG by which it selects pixel positions for embedding data. By default, it uses AES-128. You should not rely on steghide for securing your data cryptographically (see the <a href="../index.html">introduction to steganography</a>), and when in doubt you can separately encrypt the file before embedding, but you may still want to change the used algorithm. For this, simply use <code class="nim">-e <i>algorithm</i> <i>mode</i></code>. You can list all available modes with <code class="nim">steghide encinfo</code>. So as example, to embed our previous picture using AES-256 in cipher feedback mode, you would use this:</p>
<p>As you've seen, steghide needs a passphrase to embed and extract data. (Note: using an empty passphrase can lead to issues extracting.) This passphrase is used to both encrypt your file before embedding and to seed the PRNG by which it selects pixel positions for embedding data. By default, it uses AES-128. You should not rely on steghide for securing your data cryptographically (see the <a href="../stegaography/index.html">introduction to steganography</a>), and when in doubt you can separately encrypt the file before embedding, but you may still want to change the used algorithm. For this, simply use <code class="nim">-e <i>algorithm</i> <i>mode</i></code>. You can list all available modes with <code class="nim">steghide encinfo</code>. So as example, to embed our previous picture using AES-256 in cipher feedback mode, you would use this:</p>
<pre><code class="nim">$ steghide embed -cf apod20240824.jpg -ef bitcoin.pdf -e rijandael-256 cfb </code></pre>