Hi JK,
See the following link:
http://help.sap.com/saphelp_smp306svr/helpdata/en/7c/2c86f9700610149f5af899edd0de0c/content.htm
To encrypt configuration values according to this specification, run the SAP Mobile Platform Server executable JAR in the <SMP_HOME>\Server\tools\cipher folder:
\tools\cipher\Java –jar CLIEncrypter.jar <KEY> <TEXT> [<KEYLENGTH>]
Regards,
Kiran