An initial display configuration could concentrate on giving the user the correct model of the relationship between public and private keys and a clear understanding of the functions for acquiring and distributing keys. Designing an effective user interface for key management is even more difficult. All degrees of trust felt by the user must be fit into one of those three cubby holes. A definite improvement, for example, would be to generate a diagram of how a key was validated when requested by the user. Relevant comments from the paper include the following.
Users are likely to be uncertain on how and when to grant accesses.
Place a high priority on making sure users understand their security well enough to prevent them from making potentially high-cost mistakes. Such mistakes include accidentally deleting the private key, accidentally publicizing a key, accidentally revoking a key, forgetting the pass phrase, and failing to back up the key rings.