103 lines
6.3 KiB
HTML
103 lines
6.3 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Password system values: Password reuse cycle" />
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<meta name="abstract" content="Specifies when a password can be used again. (QPWDRQDDIF)" />
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<meta name="description" content="Specifies when a password can be used again. (QPWDRQDDIF)" />
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<meta name="DC.Relation" scheme="URI" content="rzakzpasswordoverview.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakzlocksecurity.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakzfinder.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzakzqpwdrqddif" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Password system values: Password reuse cycle</title>
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</head>
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<body id="rzakzqpwdrqddif"><a name="rzakzqpwdrqddif"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Password system values: Password reuse cycle</h1>
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<div><p>Specifies when a password can be used again. (QPWDRQDDIF)</p>
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<p><span class="uicontrol">Password reuse cycle</span>, also known as <span class="uicontrol">QPWDRQDDIF</span>,
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is a member of the password category of i5/OS™ system values. You can use this system
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value to specify when a password can be used again. To learn more, keep reading.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th colspan="2" valign="top" class="firstcol" id="d0e31">Quick reference</th>
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</tr>
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</thead>
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<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
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<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
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select your system, <span class="menucascade"><span class="uicontrol"></span> > <span class="uicontrol">Configuration
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and Service</span> > <span class="uicontrol">System Values</span> > <span class="uicontrol">Password</span> > <span class="uicontrol">Validation</span></span></td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
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<td valign="top" headers="d0e53 d0e31 ">All object (*ALLOBJ) and security administrator (*SECADM)</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
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<td valign="top" headers="d0e58 d0e31 ">After 1 password</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
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<td valign="top" headers="d0e63 d0e31 ">Immediately</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
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<td valign="top" headers="d0e68 d0e31 ">Yes Lock function of security-related system values <br /><img src="rzakz503.gif" alt="Lockable system value" /><br />(Click for details)</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>You may specify
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how many of the previous passwords are checked for a duplicate password. This
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option provides additional security by preventing users from specifying passwords
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they have used previously. This option also prevents a user whose password
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has expired from changing it and then immediately changing it back to the
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old password.</p>
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<p>The following are possible values:</p>
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<ul><li>After 1 password (0)</li>
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<li>After 4 password (8)</li>
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<li>After 6 password (7)</li>
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<li>After 8 password (6)</li>
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<li>After 10 password (5)</li>
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<li>After 12 password (4)</li>
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<li>After 18 password (3)</li>
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<li>After 24 password (2)</li>
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<li>After 32 password (1)</li>
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</ul>
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<p>The suggested setting is after 10 passwords (5). Select a value of
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10 or more to prevent the use of repeated passwords. It is recommended to
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use a combination of the Password expiration value and the Password reuse
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cycle value to prevent a password from being reused for at least 6 months.
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For example, select <span class="uicontrol">30 days</span> for <span class="uicontrol">Password
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Expiration</span> (days after last change) and <span class="uicontrol">After 10 passwords</span> for <span class="uicontrol">Password
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re-use cycle</span>. This means a typical user, who changes passwords
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when warned by the system, will not repeat a password for approximately 9
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months.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
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learn more, go to the password system values overview topic. If you are looking
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for a specific system value or category of system values, try using the i5/OS system
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value finder.</p>
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</div>
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</div>
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<div><div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakzpasswordoverview.htm" title="Use i5/OS password system values to control the password values and password restrictions.">System values: Password overview</a></div>
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<div><a href="rzakzlocksecurity.htm" title="Find information about how to lock and unlock system values. Only some system values can be locked. This will provide you with a description of the lock function, what system values can be locked, and how to lock and unlock them.">Lock function of security-related system values</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzakzfinder.htm">System value finder</a></div>
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</div>
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</div>
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</body>
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</html>
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