How to Scramble BLOB data stored in Tables

I have received a directive from the top management, in their drive to comply with security standards, that BLOB data stored in the database ( e.g., Word, Excel, PDF, .... documents) needs to be scrambled in DEV environment.
I have written up a routine which will scramble CHAR/VARCHAR/NUMBER, as this sounded more logical to me.
But, have come to a stand-still in figuring out how to scramble binary data??????
Is this at all possible? To me, it sounds impossible, but I'm open to ideas.
Has anyone out there thought up of a solution to this?
If so, please do advice.
Eager to know.

Hello Dave & BluShadow,
Thanks for your responses.
So, 10g is the answer huh.... That's not going to make people jump with joy, at least they'll hold off on this for now. My other possible alternative, is to have one dummy BLOB each of Word Doc, Excel, PDF, ... and overwrite each actual file attachment with the dummy. I know... I know.. not the best.
Regarding the management stuff... Hmm... This entire thing comes up because of the policy of refreshing the DEV / TEST environments with the actual production data. They've been doing this for a long long time.... The Good side to this is that they've taken the step in the right direction on this one, though I wish it would have been to totally avoid doing this kind of a refresh and use test data.
Thanks again. Do let me know if there's anyother alternative too.

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