How to encrypt Text and still be able to use full text search? 3rd Attempt ++

[mos]

I posted this message twice in the past 3 days, and it never gets on the 
mailing list. Why?
Here it is again:

I have a Text field that contains paragraph text and for security reasons I 
need to have it encrypted. If I do this, how can I still implement full 
text search on it?
Also, I have a lot of Float columns that need to be protected but the user 
has to use comparison operators like ">" and "<" on them. Any recommendations?

TIA
Mike