127 lines
7.0 KiB
HTML
127 lines
7.0 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 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="Restrict duplicate passwords" />
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<meta name="abstract" content="This system value controls whether the password must be different from previous passwords." />
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<meta name="description" content="This system value controls whether the password must be different from previous passwords." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Restrict duplicate passwords</title>
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</head>
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<body id="qpwdrqddif"><a name="qpwdrqddif"><!-- --></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">Restrict duplicate passwords</h1>
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<div><p>This system value controls whether the password must be different
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from previous passwords.</p>
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<p>This system value controls whether the password must be different from
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previous passwords. This value sets a number of previous passwords that are
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checked for duplicate passwords. This value provides additional security by
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preventing users from specifying passwords used previously. It also prevents
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a user whose password has expired from changing it and then immediately changing
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it back to the old password.</p>
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<p>See <a href="#qpwdrqddif__quickref">Quick reference</a> table
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for an overview of the restrict duplicate passwords system value.</p>
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<div class="p">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Possible values for the restrict duplicate passwords
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system value</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e29">iSeries™ Navigator</th>
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<th valign="bottom" id="d0e33">Character-based interface</th>
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<th valign="bottom" id="d0e35">Description</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e29 ">Password re-use cycle</td>
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<td valign="top" headers="d0e33 "><em>number-of-password-values-checked</em></td>
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<td valign="top" headers="d0e35 ">Specify the number of passwords that are checked for
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duplicates.</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>
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<p><strong>Relationship to security policy</strong></p>
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<p>Within your security policy you should describe the password rules that
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are defined by the system values related passwords. For this system value,
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inform users that they cannot recycle passwords before this value has exceeded.
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Password recycling allows users to choose between three or four favorite passwords,
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however; this poses a security threat to your system. To minimize this threat,
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use this system value with the password expiration system value to prevent
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a password from being reused for at least 6 months. For example, if you selected
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30 days for password expiration interval and selected 10 passwords for the
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password re-use cycle, then a typical user, who changes passwords when warned
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by the system, will not repeat a password for approximately 9 months.</p>
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<div class="p">
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<div class="tablenoborder"><a name="qpwdrqddif__quickref"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="qpwdrqddif__quickref" frame="border" border="1" rules="all"><caption>Table 2. Quick Reference. Provides
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details for the restrict duplicate passwords system value.</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e64">iSeries Navigator name</th>
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<th valign="bottom" id="d0e68">Password re-use cycle</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e64 ">Character-based interface name</td>
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<td valign="top" headers="d0e68 ">QPWDRQDDIF</td>
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</tr>
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<tr><td valign="top" headers="d0e64 ">Authority</td>
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<td valign="top" headers="d0e68 "><p>All object access (*ALLOBJ)<br />
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Security administrator (*SECADM)</p>
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<div class="note"><span class="notetitle">Note:</span> The Security Officer (QSECOFR) user profile is shipped with
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these authorities. </div>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e64 ">How to access</td>
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<td valign="top" headers="d0e68 "><div class="p"><strong>iSeries Navigator</strong><ol><li>Expand <span class="menucascade"><span class="uicontrol">Security</span> > <span class="uicontrol">Policies</span></span>.</li>
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<li>Right click <strong>Password Policy</strong> and select <strong>Properties</strong>.</li>
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<li>On the <strong>Validation</strong> page, you will find the options for password
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re-use.</li>
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</ol>
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</div>
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<div class="p"><strong>Character-based interface</strong><ol><li>In the character-based interface, type <samp class="codeph">WRKSYSVAL QPWDRQDDIF</samp>.</li>
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</ol>
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</div>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e64 ">Changes take effect</td>
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<td valign="top" headers="d0e68 ">Immediately</td>
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</tr>
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<tr><td valign="top" headers="d0e64 ">Default value</td>
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<td valign="top" headers="d0e68 ">After one password</td>
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</tr>
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<tr><td valign="top" headers="d0e64 ">Recommended value</td>
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<td valign="top" headers="d0e68 ">After 10 passwords</td>
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</tr>
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<tr><td valign="top" headers="d0e64 "><a href="rzamvlockdown.htm">Lockable</a></td>
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<td valign="top" headers="d0e68 ">Yes</td>
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</tr>
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<tr><td valign="top" headers="d0e64 ">Special considerations </td>
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<td valign="top" headers="d0e68 ">Select a value of 10 or more to prevent the use of repeated
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passwords. It is recommended to use a combination of the Password expiration
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value and the Password reuse cycle value to prevent a password from being
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reused for at least 6 month</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>
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<p>For more in-depth information about this security value, see Chapter 3,
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"Security System Values" in <a href="../books/sc415302.pdf" target="_blank">Security Reference</a>. </p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzamvpwdsysval.htm" title="In addition to setting signon system values, you also need to decide rules regarding users passwords">Password system values</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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