1. You need to create a new user id and Grant SSL rights to it. So this user id can connect to Aurora / MySQL only using Secured connection.
GRANT USAGE ON *.* TO 'admin'@'%' REQUIRE SSL
2. Download public RDS key (.pem fie) from AWS  (http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Aurora.html#Aurora.Overview.Security.SSL)
3. Downloaded file contains certificates / keys for each region.
4. Split certificates from .PEM file into different .PEM files
5. Use JDK keytool command utility to import all these PEM files into a single truststore (xyz.jks) file
    a. keytool -import -alias xyz.jks -file abc1.pem -keystore truststore
6. Configure JNDI entry for your Aurora / MySQL instance in Pentaho Properties File "data-integrationsimple-jndijdbc.properties"
    a. Sample JNDI configuration
    -------------------------------------------------------------------------
    RDSSecured/type=javax.sql.DataSource
    RDSSecured/driver=com.mysql.jdbc.Driver
    RDSSecured/user=admin
    RDSSecured/password=password
    RDSSecured/url=jdbc:mysql://REPLACE_WITH_RDS_ENDPOINT_HERE:3306/DATABASE_NAME?verifyServerCertificate=true&useSSL=true&requireSSL=true
    -------------------------------------------------------------------------
7. Make sure you copied MySQL connector jar in "lib" directory of your pentaho installation. Use connector version 5.1.21 or higher.
8.
9. Create a copy of Spoon.bat / Spoon.sh based on your operating system E.g. Spoon_With_Secured_SSL_TO_RDS.bat or Spoon_With_Secured_SSL_TO_RDS.sh
10. Now we need to pass the truststore details to Pentaho at startup, so edit the copied script and append below mentioned arguments to OPT variable
    a. -Djavax.net.ssl.trustStore="FULL_PATHxyz.jks"
    b. -Djavax.net.ssl.trustStorePassword="YOUR_TRUSTSTORE_PASSWORD"
11. Use new script to start Spoon here after to establish the secure connection
12. Open/create your Job / Transformation
13. Go To View Tab - Database Connections and create new connection
    a. Connection Type: MySQL
    b. Access: JNDI
    c. JNDI Name: RDSSecured
        i. Same as name used in JDBC.properties file
14. Test Connection and you are ready…. :)