List of Abbreviations
| CA | Certification Authority | 
| CRL | Certificate Revocation List | 
| CSR | Certificate Signing Request | 
| DMZ | Demilitarized Zone | 
| FR | Foundational Requirement | 
| HTTPS | Hypertext Transfer Protocol Secure | 
| ICS | Industrial Control System | 
| ISMS | Information Security Management System | 
| IT | Information Technology | 
| NAT | Network Address Translation | 
| OT | Operational Technology | 
| PAT | Port and Address Translation | 
| PKI | Public Key Infrastructure | 
| PSK | Pre-shared Key | 
| SR | System Requirements | 
| TLS | Transport Layer Security | 
| VPN | Virtual Private Network |