Digital Certificate Access Server (DCAS)
DCAS is a TCP/IP server that runs on z/OS and OS/390 platforms. TN3270 servers connect to DCAS using Secure Socket Layer (SSL). The purpose of DCAS is to receive an application ID and a digital certificate from a TN3270 server and then ask RACF to return a valid user ID that has been associated with the certificate and to generate a passticket for the input user ID and application ID.