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Using a Self-Signed Certificate 
If you prefer, you can let the server use its self-signed certificate for digitally signing logon tickets instead of a certificate signed by the SAP CA.

The application server receives an automatically generated public and private key pair and a self-signed public-key certificate during the installation process. This information is stored in the server's SSO PSE and automatically distributed to the application server(s). You do not need to perform any additional tasks for configuring the system to use its self-signed certificate.
If you do want to change the information contained in the self-signed certificate (for example, to change the Distinguished Name), generate a new PSE and distribute it to the system's application servers. In addition, you must republish the public-key certificate to accepting systems by executing the SSO administration wizard (transaction SSO2) in the accepting system.