EP056 – Info Security Update and FIXT.1.1 Errata

Combines exchange logon/logoff requirements, unsolicited user notification, information-security changes and FIXT.1.1 application-version errata. It adds password-change and session-status capabilities to Logon and Logout, proposes an unsolicited User Notification message, deprecates encryption and signature fields embedded within FIX messages in favour of lower-network-layer protection, and adds application-version and extension identifiers to headers, logon and rejection messages. It also introduces a session reject reason for an invalid or unsupported application version.