How to Fix 'java.security.InvalidKeyException: Illegal key size' in Java?

"InvalidKeyException Illegal key size": Resolving Encryption Limitations

Overview

When encountering the error "java.security.InvalidKeyException: Illegal key size," it generally indicates restrictions on key sizes used for encryption due to US export laws. This can occur if your Java virtual machine is subject to a limited cryptography policy.

Solutions for Different Java Versions

Depending on your Java version, the solution varies:

Java 9 and Higher:

• The Unlimited Strength Jurisdiction Policy Files are included by default. If the error persists, check if the policy configuration has been modified to "limited."

Java 8 Update 161 and Higher:

• The Unlimited Strength Jurisdiction Policy is now the default. However, if the error occurs, it suggests the configuration has been changed to "limited." Follow the instructions in the subsequent "Java 8 Update 151 and Higher" section.

Java 8 Update 151 and Higher:

• The Unlimited Strength Jurisdiction Policy is included but not used by default. To enable it, edit the "java.security" file in "/jre/lib/security" (for JDK) or "/lib/security" (for JRE) and uncomment or add the line:

crypto.policy=unlimited

• Restart the JVM for the changes to take effect.

Before Java 8 Update 151:

• Install the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files from Oracle.
• Unzip the downloaded file and install the unlimited strength policy JAR files in "/lib/security" (Unix) or "libsecurity" (Windows).
• Note that the new policy file only takes effect after restarting the JVM.

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