Remote maintenance and diagnostic activities are conducted by individuals communicating through an external, non-organization-controlled network (e.g., the Internet). The use of remote maintenance and diagnostic tools is consistent with organizational policy and documented in the security plan for the information system. The organization maintains records for all remote maintenance and diagnostic activities. Other techniques and/or controls to consider for improving the security of remote maintenance include: (i) encryption and decryption of communications; (ii) strong identification and authentication techniques, such as Level 3 or 4 tokens as described in NIST Special Publication 800-63; and (iii) remote disconnect verification. When remote maintenance is completed, the organization (or information system in certain cases) terminates all sessions and remote connections invoked in the performance of that activity. If password-based authentication is used to accomplish remote maintenance, the organization changes the passwords following each remote maintenance service. NIST Special Publication 800-88 provides guidance on media sanitization. The National Security Agency provides a listing of approved media sanitization products at http://www.nsa.gov/ia/government/mdg.cfm. Related security controls: IA-2, MP-6.