Over the next few days, the previous system for payment transactions in Switzerland, Ibasec, will be deactivated: As of July 2017, the successor version SIC4 with SASS will go into operation. This is secured with the Primus HSM S500 from Securosys. It will process transactions in the amount of up to 480 billion Francs per day. What were the requirements for the system, which factors contributed to its success, and how does Securosys now stand? A success story.