cProjects, cFolders, and xRPM are all based on HTTP Internet applications. Therefore, they support the logon mechanisms provided by the SAP Web Application Server (SAP Web AS). This means that they accept SAP logon tickets, as well as X.509 digital certificates.
For more information, see the SAP Web AS Security Guide on SAP Service Marketplace at service.sap.com/securityguide → SAP Basis / Web AS → SAP Web Application Server Security Guide (ABAP + JAVA) → SAP Web AS Security Guide for ABAP Technology in the section “User Authentication”.