Correct, only Public Keys can be exported and then only under "Crypto Tools". Private keys you can never get out from DataPower but they are included in Secure Backup (if allowed at init of DataPower) and then the keys are encrypted by DataPowers internal encryption and can only be restored to another (then identical) DataPower instance.
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Anders Wasén, Sr. Solutions Architect
(a.k.a. "Offline" in DeveloperWorks)
IBM Champion, IBM DataPower Gateways, IBM Transformation Extender