What to do when Illegal key size or default parameters

--Environment - Red Hat Enterprise Linux Server release 6.3 (Santiago) - java version "1.7.0_79"

Event: InvalidKeyException occurred when decrypting process works

InvalidKeyException occurred when the process of compounding the parameters sent from other servers worked. Illegal key size or default parameters
        at javax.crypto.Cipher.checkCryptoPerm(
        at javax.crypto.Cipher.implInit(
        at javax.crypto.Cipher.chooseProvider(
        at javax.crypto.Cipher.init(
        at javax.crypto.Cipher.init(

Cause: (For Java 8 or less) AES256bit key length cannot be used

In Java, the standard library Cipher class allows you to work with AES ciphers without the use of third-party libraries. However, AES encryption seems to be subject to US export restrictions, and the standard can only handle keys up to 128 bits. AES 256 cryptography in the Java 9 era-Qiita

Action: Replace the policy file

  1. From Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files for JDK / JRE Download to Java version Download the matching zip file --This time it's Java 1.7, so download ʻ`
  2. Transfer the jar (local_policy.jarʻUS_export_policy.jar`) in the unzipped directory to the server where it will be placed.
  3. Check the Java installation directory ――It's natural ... I wrote it properly because the same version was placed in the wrong directory in two places. -How to find when you don't know the Java installation directory --Qiita
  4. Make a backup of local_policy.jarʻUS_export_policy.jar located in {java installation directory} / jre / lib / security / `
  5. Place the jar in the unzipped directory in {java installation directory} / jre / lib / security /
#Transfer to the server where the jar is placed
$ scp -i /path/to/{Private key}.pem /path/to/zip/UnlimitedJCEPolicy/*.jar ponsuke@{server}:/home/ponsuke/
local_policy.jar      100% 2500    12.2KB/s   00:00
US_export_policy.jar  100% 2487    12.1KB/s   00:00

#Log in to the server
$ ssh -i /path/to/{Private key}.pem ponsuke@{server}
Last login: Thu May 14 20:56:50 2020 from

#Check the Java installation directory
$ printenv JAVA_HOME

#Back up the jar
$ cd $JAVA_HOME/jre/lib/security/
$ sudo mv local_policy.jar local_policy.jar.bak
[sudo] password for ponsuke:
$ sudo mv US_export_policy.jar US_export_policy.jar.bak

#Place the jar in the unzipped directory
$ sudo mv /home/ponsuke/*.jar .
$ ls -la | grep jar
-rw-r--r--1 ponsuke appl 2487 May 14 21:36 2020 US_export_policy.jar
-rw-r--r--.1 root root 2397 April 11 03:55 2015 US_export_policy.jar.bak
-rw-r--r--1 ponsuke appl 2500 May 14 21:36 2020 local_policy.jar
-rw-r--r--.1 root root 2865 April 11 03:55 2015 local_policy.jar.bak

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