This paper describes the design of a Windows file-system directory service that ensures the persistence, integrity, privacy, syntactic legality, and case-insensitive uniqueness of the names it indexes. Byzantine state replication provides persistence and integrity, and encryption imparts privacy. This process excludes entire names by mapping the set of allowed strings to the set of all strings, excludes certain characters through an amended prefix encoding, excludes terminal characters through varying the prefix coding by character index, and supports case-insensitive comparison of names by extracting and encrypting case information separately. This paper also addresses the issues of hiding name-length information and access-authorization information, and it report a newly discovered problem with enforcing case-insensitive uniqueness for Unicode names.
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