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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Encryption keygen Example</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}form{display:flex;flex-direction:column;gap:.5rem;max-width:360px}label{font-weight:500;color:#0f172a}input[type=submit],input[type=text]{padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:8px;font-size:.95rem}input[type=submit]{background:#2563eb;color:#fff;border:none;cursor:pointer;margin-top:.25rem}.note{margin-top:1rem;background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#92400e;max-width:420px}</style>

</head>

<body>

  <h1>Encryption Form (Historical)</h1>

  <form action=/submit method=post>

    <label for=data>Sensitive Data:</label>

    <input id=data name=data>

    <label for=keypair>Encryption Key:</label>

    

    <keygen name=keypair id=keypair>

    <input type=submit value=Submit>

  </form>

  <p class=note><strong>Deprecated:</strong> The &lt;keygen&gt; element is obsolete. Encrypt data with the Web Crypto API over HTTPS.</p>

</body>

</html>

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HTML keygen Tag — Encryption Form