You can enrol your certificates with managed devices (i.e. routers or iPads) using SCEP (Simple Certificate Enrolment Protocol), CMP (Certificate Management Protocol), Automated Certificate Management Environment (ACME) or EST (Enrolment over Secure Transport). SCEP/CMP uses request / response model, based on HTTP request for certificate enrolment with devices. An administrator can automatically associate each device for a client certificate without requiring end-user interaction. SCEP uses the Certification Authority (CA) certificate to secure the message exchange for a Certificate Signing Request (CSR). Certificate request pertaining to enrolment protocols can be for Issuance/approval, renewal and revocation.