Transparent Data Encryption clarification

Hello All,
Does the database memory (SGA) contain clear-text or encrypted data?
With column-level TDE, encrypted data remains
encrypted inside the SGA, but with tablespace encryption, data is
already decrypted in the SGA.{color}
my doubt here is,
1. when a select query issued when and where the decryption takes place before the data comes to SGA?
2. Is there any tool to dump the duffer cache in SGA to find whether data is encrypted or not?
Plz do help me
Thanks in advance

AFAIK, TDE is for encrypting data on disk (so database cant be stolen), not for encryting data in the tables (may be wrong there)
dbms_obfuscation is deprecated in 10g, so used dbms_crypto instead - its much better

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