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    <p>Okie doke, I think I just figured this out.</p> <p>As I said above, the key bit of knowledge is that the cert doesn't matter, so long as it's generated with an algorithm that supports AES 256-bit encryption (e.g., RSA). Just to make sure that we're on the same page, for my testing, I generated my self-signed cert using the following:</p> <pre><code>keytool -genkey -alias tomcat -keyalg RSA </code></pre> <p>Now, you have to make sure that your Java implementation on your server supports AES-256, and this is the tricky bit. I did my testing on an OS X (OS 10.5) box, and when I checked to see the list of ciphers that it supported by default, AES-256 was NOT on the list, which is why using that cert I generated above only was creating an AES-128 connection between my browser and Tomcat. (Well, technically, TLS_RSA_WITH_AES_256_CBC_SHA was not on the list -- that's the cipher that you want, according to <a href="http://java.sun.com/j2se/1.5.0/docs/guide/security/jsse/JSSERefGuide.html#AppA" rel="noreferrer">this JDK 5 list</a>.)</p> <p>For completeness, here's the short Java app I created to check my box's supported ciphers:</p> <pre><code>import java.util.Arrays; import javax.net.ssl.SSLSocketFactory; public class CipherSuites { public static void main(String[] args) { SSLSocketFactory sslsf = (SSLSocketFactory) SSLSocketFactory.getDefault(); String[] ciphers = sslsf.getDefaultCipherSuites(); Arrays.sort(ciphers); for (String cipher : ciphers) { System.out.println(cipher); } } } </code></pre> <p>It turns out that JDK 5, which is what this OS X box has installed by default, needs the "Unlimited Strength Jurisdiction Policy Files" installed in order to tell Java that it's OK to use the higher-bit encryption levels; you can <a href="http://java.sun.com/javase/downloads/index_jdk5.jsp" rel="noreferrer">find those files here</a> (scroll down and look at the top of the "Other Downloads" section). I'm not sure offhand if JDK 6 needs the same thing done, but the same policy files for JDK 6 <a href="http://java.sun.com/javase/downloads/index.jsp" rel="noreferrer">are available here</a>, so I assume it does. Unzip that file, read the README to see how to install the files where they belong, and then check your supported ciphers again... I bet AES-256 is now on the list.</p> <p>If it is, you should be golden; just restart Tomcat, connect to your SSL instance, and I bet you'll now see an AES-256 connection.</p>
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    1. COUnlimited Strength Jurisdiction Policy Files must be installed in jdk home folder or just in tomcat/lib folder?
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    2. COThey need to be in your JDK's /lib/security subdirectory (e.g., $JAVA_HOME/lib/security). This information is in the README of the files linked above.
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