If you just want to hide the data, you can set the InputMask property in the table and the data will be masked by asterisks...Not very secure, but it will mask them.
I have a string of code that will encrypt/decrypt a string that could be used for this. You could call an update query from some VB code to encrypt the field in every record and then call the code again to decrypt the field when needed....
You will just need to find some way to secure the encrypter/decrypter......maybe a password protected button or something....that is for you to decide...
Send me an email to the address in my sig block and I will forward you a sample database with this all set up.....
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Robert L. Johnson III, A+, Network+, MCP
Access Developer/Programmer
robert.l.johnson.iii@citigroup.com