<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-0747B7D8-86B4-51DE-BC71-7FACE61EB5E2" xml:lang="en"><title>Database

encryption</title><shortdesc>Database data can be encrypted by the DBMS.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>Database data can be encrypted by a key that is generated by the DBMS.

Access to this key is protected by encryption and decryption keys that are

provided by the client. This allows a client to change (for example) the user

password without requiring the entire database to be re-encrypted.</p>

<p>It is not possible to turn a secure database into a plain-text database

and vice-versa—this can only be done by copying the data from one database

to another</p>

<p>It is important to note that encrypting a database has an impact on performance.</p>

<p>The <codeph>RDbStoreDatabase</codeph> and <codeph>RDbNamedDatabase</codeph> classes

provide variants of the <codeph>Create()</codeph> and <codeph>Open()</codeph> functions

that can create and open a secure database. The access key can be changed

using the <codeph>ChangeSecurity()</codeph> member function of the <codeph>RDbDatabase</codeph> base

class.</p>

</conbody></concept>