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<p>on using passwords or passphrases of adequate complexity, making such an attack computationally infeasible for the attacker. Some systems, such as <a href="page.php?w=Pretty_Good_Privacy">PGP</a> and <a href="page.php?w=Wi-Fi_Protected_Access">Wi-Fi WPA</a>, apply a computation-intensive hash to the password to slow such attacks, in a technique known as <a href="page.php?w=key_stretching">key stretching</a>.</p>

<p><big>Limits on the number of password guesses</big></p>
<p>An alternative to limiting the rate at which an attacker can make guesses on a</p><p>
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