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<a accesskey="3" href="page.php?w=cryptography&amp;p=2">3.Next</a>
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<p><b>Cryptography</b>, or <b>cryptology</b>, is the practice and study of techniques for <a href="page.php?w=secure_communication">secure communication</a> in the presence of <a href="page.php?w=Adversary_%28cryptography%29">adversarial</a> behavior. More generally, cryptography is about constructing and analyzing <a href="page.php?w=Communication_protocol">protocols</a> that prevent third parties or the public from reading private messages. Modern cryptography exists at the intersection of the disciplines of mathematics, <a href="page.php?w=computer_science">computer science</a>,</p><p>
<a accesskey="3" href="page.php?w=cryptography&amp;p=2">3.Next</a>
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