OrbitSecure by SpiderOak is a lightweight software-only space cybersecurity platform designed for ground and space platforms. It provides end-to-end security for space-based communications, enabling secure command, control, and communication (C3) for hybrid space architectures over untrusted infrastructure. OrbitSecure implements a Zero Trust architecture, allowing for secure data exchange and communication across trusted and untrusted assets in space-based missions. It combines zero-trust encryption and decentralized security policy enforcement to ensure authority, identity, and integration with existing systems across operational dimensions. The platform is designed to protect and manage data in remote and contested edge environments, including disrupted, disconnected, intermittent, and low-bandwidth (DDIL) environments, supporting hybrid, multi-domain, and multi-customer systems across multiple security domains.