Secure communications are systems and methods designed to protect the confidentiality, integrity, or availability of information as it is transmitted. Protections can include encryption, authentication, access controls, and resilient network design. The term covers more than secrecy: it can also mean preventing messages from being altered, ensuring they reach authorized users, and maintaining service during disruption.
In cybersecurity, secure links help protect sensitive data and operational commands from interception, tampering, or outages. Attackers may target communications by stealing credentials, exploiting network equipment, or disrupting connections. Defenders use measures such as end-to-end encryption, strong key management, authenticated devices, monitoring, and backup paths. In satellite and other dual-use systems, these protections support both civilian services and strategic operations, so procurement and security requirements can shape how systems are built and maintained.