[ns] predetermined data encryption

[Sheraz Nadeem]

hi all,
        i am using ns 2.31. if i want to do encryption on a predetermined data then how i would do this in case of the routing agent or with any other approach. and how can i change a malicious node (attacker)'s routing agent, not able to decrypt the data,and the registered users(being attacked) routing agent. its an ad hoc scenario. 
can i change/add the functionality to  AODV to encrypt/decrypt the data? 
thanks byee anyone quickly respond plz i have to do it.
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