Hi, SIC is documented in R82 Quantum Security Management Administration Guide and the process for renewal is documented in here: Certificate Longevity and Statuses
Automatic renewal of SIC certificates ensuring continuous SIC connectivity
SIC certificates are renewed automatically after 75% of the validity time of the certificate has passed. If, for example, the SIC certificate is valid for five years. After 3.75 years, a new certificate is created and downloaded automatically to the SIC entity. This automatic renewal ensures that the SIC connectivity of the Security Gateway is continuous. The administrator can revoke the old certificate automatically or after a set period of time. By default, the old certificate is revoked one week after certificate renewal.