I have data guard setup after following document in http://arjudba.blogspot.com/2010/10/step-by-step-create-oracle-11gr2.html
Now I want to do transparent data encryption.
What will happen existing data guard setup?
Both physical and standby database are RAC database.
I have never done it but I don't see any conflict with Data Guard.
I would backup the original wallet several times and keep a copy offsite.
These are all worth a look :
Using Transparent Data Encryption In An Oracle Dataguard Config in 10gR2 [ID 389958.1]
Managing TDE wallets in a RAC environment [ID 567287.1]
Known TDE Wallet Issues [ID 1301365.1]
Opening the Wallet on One RAC Node Closes It on the Other Nodes [ID 1294017.1]