To decrypt the SK using a customized decryption package, perform the following steps: </br>

1. Create a Maven project, compile a decryption method, provide the full restriction name and method name of the decryption class, 
   and add the class name and method name to apm.config.</br>

   eg:decrypt.className=com.demo.DecryptDemo</br>
      decrypt.methodName=decrypt</br>

2. Copy the .jar package of the Maven project to the apm-javaagent/ext package.</br>

3. Change the value of secret.key to the encrypted value.</br>

Note: The decryption method has only one String input parameter (the value of secret.key). That is, use the decryption method to pass in the value of secret.key and return the decrypted SK,
Before using the decryption method, you need to check whether the return value of the decryption method is the same as the original SK.</br>
