Appendix A Transport Layer Security Application Transparent Transport Layer Security (AT-TLS) provides a mechanism for securing the connection between the Plug-in’s application engine and the CICS regions to which it connects. This appendix provides a brief description of what it is and how to configure the mechanism. This is not intended to replace any of the AT-TLS documentation, but only to provide the project developer with enough information to communicate properly with their mainframe administrators. Topics • RACF Configuration • BWCP Project Configuration