Split Key proposal

[Kelley Burgin <kwburgi@tycho.ncsc.mil>]

Here is the latest on split keys for discussion today: I'd like to get  
an idea of whether it's worth proceeding with the following. It seems  
to be the most reasonable approach until we have ACLs in KMIP. The  
benefit of Create Split Key is pushing the algorithmic complexity of  
key splitting to the server. The benefit of Join Split Key is the  
ability for a client to combine and use a key without the key being  
exposed to the client.

Create Split Key: returns the UUIDs of the splits. Client side  
distribution of splits. No ACLs. Links can be discussed.

Join Split Keys: takes as input a list of UUIDs corresponding to  
splits and returns a new UUID for the key created by combining the  
splits. This is a new operation to be considered with or separate from  
Create Split Key.

Kelley