Java數據加密時密碼的長度限制

java中的AES 256算法遇到 Illegal key size or default parameters錯的解決辦法

把裏面的兩個jar包：local_policy.jar 和 US_export_policy.jar 替換掉原來安裝目錄C:\Program Files\Java\jre6\lib\security 下的兩個jar包接能夠了

Most likely you don't have the unlimited strength file installed now.

You may need to download this file:

Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 6

Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 7 Download

Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 8 Download

Install the file in ${java.home}/jre/lib/security/.