How to use encryption?

Hi all,
After installing Oracle db 11.2.0.1 on my Win7 laptop, I got the following completion message:
The Database Control URL is https://localhost:5500/em
Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted.
The encryption key has been placed in the file: C:/app/dtc/product/11.2.0/dbhome_1/localhost_orcl/sysman/config/emkey.ora.
Please ensure this file is backed up as the encrypted data will become unusable if this file is lost.
How do I use this file? Or how do I validate/check if my data is encrypted on not?
How do I make it unusable for testing purpose?
Thanks,

1 Oracle is not about rocket science
2 You do not use this file, db control uses this file
3 Obviously, when it is missing access using SSL will not work anymore
4 Did you even look into it? It is a text file, so tampering with it should not be a problem.
Sybrand Bakker
Senior Oracle DBA

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