Since I am relatively new to the field of encryption forgive me if this is a FAQ. Has anyone ever done anything with an encryption scheme that allows multiple unlocking keys? What I'm thinking about is a way to encrypt some data and then create multiple keys that will decrypt the data. I want to be able to encrypt a document and then give multiple people access to the document and be able to lock out a key and/or generate new keys without having to redistribute keys to everybody that already has one. I realize that this makes it easier to attack the encrypted information since there are multiple keys to unlock the data but I don't consider this a big problem. If someone wants to throw heavy duty horsepower at the problem they will crack it eventually anyway. Mike -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Mike Markley || The opinions here do not represent the mmarkley@microsoft.com || opinions of my employer. Attempts to || associate the two are pointless. "I want to look at life, In the available light" - Neil Peart -