Null Cipher won't work under global policy file. Instead, it throw an exception as follows:

=========== NCFunc ==========
java.lang.SecurityException: Double encryption
        at javax.crypto.Cipher.a([DashoPro-V1.2-120198], Compiled Code)
        at javax.crypto.Cipher.doFinal([DashoPro-V1.2-120198], Compiled Code)
        at TestCipherNCFunc.runTest(TestCipherNCFunc.java, Compiled Code)
        at TestCipherNCFunc.run(TestCipherNCFunc.java, Compiled Code)
        at TestCipherNCFunc.main(TestCipherNCFunc.java, Compiled Code)
STATUS:Failed. All Failed

Note: Null Cipher works well with domestic policy