HSIN Release 3 User Accounts: Identity Proofing Service, May 22, 2013, (PDF 19 pages, 271 KB). The Homeland Security Information Network (HSIN) is maintained by the Department’s Office of Operations Coordination and Planning (OPS). HSIN is designed to facilitate the secure integration and interoperability of information sharing resources among federal, state, local, tribal, private-sector commercial, and other non-governmental stakeholders involved in identifying and preventing terrorism as well as in undertaking incident management activities. The HSIN program prepared this PIA Update to clarify information about HSIN’s use of and the data handling practices of the identity proofing service (IDP Service2). This PIA documents the program’s updated understanding of the information collected and stored by the IDP Service during, and following, new user registration on the HSIN R3 platform.