VTAM® implements LU 6.2 security option sets for session-level security and data encryption. VTAM also offers pass-through support for conversation-level security for application programs that implement the conversation-level security option sets. For a complete description of the LU 6.2 security option sets, see VTAM and security option sets.

VTAM's session-level verification, conversation-level security, and data encryption services are functionally independent. An LU 6.2 application program can use any combination of these services.