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<a accesskey="3" href="page.php?w=Key_size&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=cryptography">cryptography</a>, <b>key size</b> or <b>key length</b> refers to the number of <a href="page.php?w=bit">bit</a>s in a <a href="page.php?w=key_%28cryptography%29">key</a> used by a <a href="page.php?w=Cryptography">cryptographic</a> algorithm (such as a <a href="page.php?w=cipher">cipher</a>).</p>

<p>Key length defines the upper-bound on an algorithm's <a href="page.php?w=Security_level">security</a> (i.e. a logarithmic measure of the fastest known attack against an algorithm), because the security of all</p><p>
<a accesskey="3" href="page.php?w=Key_size&amp;p=2">3.Next</a>
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