Siemens AG Siemens AG Cisco Systems Sandelman Software Works This document defines enhancements to Bootstrapping Remote Secure Key Infrastructure (BRSKI, RFC8995) as BRSKI with Pledge in Responder Mode (BRSKI-PRM). BRSKI-PRM supports the secure bootstrapping of devices, referred to as pledges, into a domain where direct communication with the registrar is either limited or not possible at all. To facilitate interaction between a pledge and a domain registrar the registrar-agent is introduced as new component. The registrar-agent supports the reversal of the interaction model from a pledge-initiated mode, to a pledge-responding mode, where the pledge is in a server role. To establish the trust relation between pledge and registrar, BRSKI-PRM relies on object security rather than transport security. This approach is agnostic to enrollment protocols that connect a domain registrar to a key infrastructure (e.g., domain Certification Authority).