Gerry,

Perhaps you should encrypt NAMEFIELD:

replace NAMEFIELD with crypt( NAMEFIELD ) all

and keep your index simple:

index on NAMEFIELD tag NAMEFIELD

Craig's encryption works with strings or files (as a block) ... it is not aware of DBF files or their structure.

www.xitech-europe.com has a product called Cryptor that allows you to transparently encrypt/decrypt DBF files while you're working with them.

Hope that helps,
Malcolm