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Thank you for your interest in this question.

If a bit key is needed the best solution, perhaps the only solution, is to install the Policy file if needed, not truncate the key potentially weakening the security and may not be possible in the case of interoperability.

Ketan Vishwakarma 2 3. Uncomment or include the line crypto. I also got the issue but after replacing existing one with the downloaded from JCE one resolved the issue.

Szyfr Vigenere`a – Algorytmy i Struktury Danych

JesseAdelman – Unfortunately this is almost 7 years kryptografiaa, not much can be done. Illegal key size or default Both jars and detailed concept can be understand from the link: RC2ParameterSpec”, ; permission javax. Saad Malik 11 For more details, you can refer to my personal blog post below – How to install Java Cryptography Extension JCE unlimited strength jurisdiction policy files. With Java 9, Java 8uJava 7u and Java 6u the limitation is now disabled by default.


The Cipher classes documentation points to valid key sizes for each crypto type. CryptoPermission “DES”, 64; permission javax. Now it’s a property change to switch.

Java Security: Illegal key size or default parameters? – Stack Overflow

Aniket Thakur 41k 24 CryptoPermission “RC2”,”javax. New crypto files provided unlimited strength. Just use the OpenJDK and it will work. Sulabh Jain 1 9. If you are using Linux distribution with apt and jsvie added webupd8 PPA, you can simply run the command apt-get install oracle-java8-unlimited-jce-policy Other updates: Since Java 9 and Java 8u there’s no need to download and manually install jurisdiction policy files anymore. Make sure you edit the file using an editor run as administrator.

I’m using the OpenJDK and it doesn’t work with it. Any AES implementation that did not support bit keys would be essentially useless because it would not be able to decrypt substantial numbers of AES encryptions using bit keys.

Tried using 6 and 7, but they didn’t work. Most likely you don’t have the unlimited strength file installed now.

34308 java – kryptografia

This may also be thrown as error: Update to AniketThakur answer. Whomever asked would need to change it. The page it links to appears to be gone, but one of kryptovrafia responses might be what you need: Kirby 9, 6 59 This is an example of generating a key that would work with any JVM version without modifying the policy files.


In the JDK installation folder there is a jre folder.

Had to install 8. Dev G 3 15 Starting from Java 9 or 8u, you can use comment a line in the file: To enable it, you need to edit the java. C Deepak 14 CryptoPermission “RC5”,”javax.

The policy change only takes effect after restarting the JVM. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. To enable unlimited cryptography, one can use the new crypto. Shaaban Ebrahim 2, 1 9 Would you like to answer one of these unanswered questions instead? By default, Java only supports AES bit 16 bytes key sizes for encryption.

Before Java 8 Update rest of the answers hold valid. I had asked a question about this earlier, but it didn’t get answered right and led nowhere. By default Java only supports AES bit key sizes for encryption. You have to install the unlimited Strength Jurisdiction Policy Files jar files.

My guess would be that it has something to do with the Java installation configuration because it works in the first one, but doesn’t work in the later version.