When an author has a pseudonym, the linking relationships between entities (e.g., identities and persons) become more complex or ambiguous for international authority data repositories such as Virtual International Authority File, given semantics used in different source files, changes in standards over time, and algorithms for clustering and reconciliation. This article examines how to improve the linking relationships of persons with more than one identity through definition comparisons, case studies, and tests in terms of linked data. In light of identity management in cyberspace, library authority data or identity management should include the perspectives of privacy and security.