The 1098 has an ignition immobilizer system, to prevent start-up theft. If both keys are lost, you should take the small ID tag that was affixed to them when you purchased the bike (you did put that in a safe place, separate from the keys, didn't you?) and your Code Card (black card that came with the keys; has the electronic and mechanical codes listed on the back) to your Ducati Service Center and they can obtain and program new keys for you. (Reference: pages 36-37 of the 1098 MOM)