readme.txt

使用SUN JCE 1.6 的授权文件,按照里面的提示安装后就可正常使用SUN JCE 提供的安全编程功能。

   Unlimited Strength Java(TM) Cryptography Extension Policy Files
   for the Java(TM) Platform, Standard Edition Development Kit, v6

                               README

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CONTENTS
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     o Introduction
     o Copyright
     o Understanding The Export/Import Issues
     o Where To Find Documentation
     o Installation
     o Questions, Support, Reporting Bugs, and Feedback


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Introduction
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Thank you for downloading the Unlimited Strength Java(TM) Cryptography
Extension (JCE) Policy Files for the Java(TM) Platform, Standard
Edition Development Kit, v6.

Due to import control restrictions, the version of JCE policy files that
are bundled in the JDK(TM) 6 environment allow "strong" but limited
cryptography to be used. This download bundle (the one including this
README file) provides "unlimited strength" policy files which contain
no restrictions on cryptographic strengths.

Please note that this download file does NOT contain any encryption
functionality since such functionality is supported in Sun's JDK 6.
Thus, this installation applies only to Sun's JDK 6, and assumes
that the JDK 6 is already installed.


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Copyright
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The copyright notice governing this product's use can be found in
COPYRIGHT.html.  This file is normally found in the same directory
as this README.txt file.


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Understanding The Export/Import Issues
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JCE for JDK 6 has been through the U.S. export review process.
The JCE framework, along with the SunJCE provider that comes
standard with it, is exportable.

The JCE architecture allows flexible cryptographic strength
to be configured via jurisdiction policy files. Due to the
import restrictions of some countries, the jurisdiction policy
files distributed with the JDK 6 software have built-in
restrictions on available cryptographic strength. The jurisdiction
policy files in this download bundle (the bundle including this
README file) contain no restrictions on cryptographic strengths.
This is appropriate for most countries. Framework vendors can
create download bundles that include jurisdiction policy files
that specify cryptographic restrictions appropriate for countries
whose governments mandate restrictions. Users in those countries
can download an appropriate bundle, and the JCE framework will
enforce the specified restrictions.

You are advised to consult your export/import control counsel or
attorney to determine the exact requirements.


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Where To Find Documentation
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The following documents will be of interest to you:

    o  The Java(TM) Cryptography Architecture (JCA) Reference Guide at:

       http://java.sun.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html

    o  The Java Security web site has more information about JCE,
       plus additional information about the Java Security Model.
       Please see:

       http://java.sun.com/products/jce/
       http://java.sun.com/security/


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Installation
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Notes:

  o Unix (Solaris/Linux) and Win32 use different pathname separators, so
    please use the appropriate one ("\", "/") for your
    environment.

  o <java-home> refers to the directory where the Java SE Runtime
    Environment (JRE) was installed.  It is determined based on whether
    you are running JCE on a JRE with or without the JDK installed. The
    JDK contains the JRE, but at a different level in the file
    hierarchy. For example, if the JDK is installed in
    /home/user1/jdk1.6.0 on Unix or in C:\jdk1.6.0 on Win32, then
    <java-home> is

        /home/user1/jdk1.6.0/jre            [Unix]
        C:\jdk1.6.0\jre                    [Win32]

    If on the other hand the JRE is installed in /home/user1/jre1.6.0
    on Unix or in C:\jre1.6.0 on Win32, and the JDK is not
    installed, then <java-home> is

        /home/user1/jre1.6.0                [Unix]
        C:\jre1.6.0                        [Win32]

  o On Win32, for each JDK installation, there may be an additional
    JRE installed under the "Program Files" directory. Please make
    sure that you install the unlimited strength policy JAR files
    for all JREs that you plan to use.


Here are the installation instruction:

1)  Download the unlimited strength JCE policy files.

2)  Uncompress and extract the downloaded file.

    This will create a subdirectory called jce.
    This directory contains the following files:

        README.txt                   This file
        COPYRIGHT.html               Copyright information
        local_policy.jar             Unlimited strength local policy file
        US_export_policy.jar         Unlimited strength US export policy file

3)  Install the unlimited strength policy JAR files.

    To utilize the encryption/decryption functionalities of
    the JCE framework without any limitation, first make a copy of
    the original JCE policy files (US_export_policy.jar and
    local_policy.jar in the standard place for JCE
    jurisdiction policy JAR files) in case you later decide
    to revert to these "strong" versions. Then replace the strong
    policy files with the unlimited strength versions extracted in the
    previous step.

    The standard place for JCE jurisdiction policy JAR files is:

        <java-home>/lib/security            [Unix]
        <java-home>\lib\security           [Win32]


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Questions, Support, Reporting Bugs, and Feedback
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Questions
---------

For miscellaneous questions about JCE usage and deployment, we
encourage you to read:

    o Information on the JCE web site

      http://java.sun.com/products/jce

    o The Java Security Q&A Archives

      http://archives.java.sun.com/archives/java-security.html

    o The Java Developer Connection(SM) forums. These discussion forums
      allow you to tap into the experience of other users, ask
      questions, or offer tips to others on a variety of Java-related
      topics including JCE. There is no fee to participate.

      http://forum.java.sun.com/


Support
-------

For more extensive JCE questions or deployment issues, please contact
our Technical Support staff at:

    http://developers.sun.com/prodtech/support/

Please be aware that we may be barred from offering technical support
specifically regarding encryption implementations of the JCE APIs to
people outside the U.S. or Canada, according to U.S. regulations.


Reporting Bugs
--------------

To report bugs with sample code or request a feature, please see:

    http://java.sun.com/cgi-bin/bugreport.cgi

Bug reports with test cases are highly appreciated!


Feedback
--------

Please e-mail general comments about JCE to:

    [e-mail]

The above mailing list is not a subscription list or a support
mechanism.  It is simply a one-way channel that you can use to
send comments to the Java Standard Edition security team.
Please include the keyword "JAVASEC" in the Subject of your
email so it can be distinguished from spam.

Though we value your input, before sending your feedback please review
our pages of Frequently Asked Questions, available from the JCE web
site:

    http://java.sun.com/products/jce

and search the Java Security Q&A Archives:

    http://archives.java.sun.com/archives/java-security.html

Please note that due to the volume of messages we receive, we
may not be able to respond to every individual message.

For other comments/suggestions concerning the web sites please
use the feedback form at:

    http://java.sun.com/feedback/index.html