についてネットでこの記事を見つけたHow to sign the JAR Files
ことがあります。これには何らかの内容が含まれている可能性があり、何らかの形で役立つ可能性があります。ご覧ください:
Sign All Applet JAR files
Applets are back! And now applets can do more than ever before thanks to
signed JAR files. By signing your JARs, you can get access to the filesystem
and other resources that were previously off-limits, provided the user
grants your applet those privileges. And signing JAR files is now very easy
thanks to tools bundled with the JDK. However, be certain to sign all JAR files
used by your Java applet. If you sign the JAR file with your main applet class,
your applet will launch. If it later uses classes from another JAR file, though,
you can run into trouble. If the newly-loaded class tries a restricted operation
and its JAR file isn't signed, your applet will fail at that point with a
security exception. Rather than waiting for this and debugging it when it occurs,
save yourself the trouble and sign all of your JAR files up front.
You can create your own certificate using tools provided by the JDK.
keytool -genkey -alias mykey lets you create your own certificate. Be sure to
specify an expiration date far in the future with -validity 1000. The default is
only 6 months.
Sign your JAR files with jarsigner my.jar mykey (where my.jar is the name of
the jar file to sign).
Deploy all of your JAR files to a folder on your web server, add an HTML page
with the applet tag, and let the world enjoy your new applet with powerful
permissions.
keytool -genkey -v -key store mycompany.keystore -alias myalias_goes_here -keyalg RSA -keysize 2048 -validity 10000