Store-and-forward is a messaging method in which a node receives data, saves it locally, and passes it on later when a next hop becomes available. It is common in delay-tolerant networks, mesh systems, satellite links, and offline-capable communication tools where a direct end-to-end path may not exist.
In cyber security, store-and-forward changes both reliability and risk. It helps messages survive intermittent connectivity, but it also means intermediate nodes must be trusted to hold sensitive content, protect it at rest, and forward it correctly. Attackers may target these nodes to read queued messages, alter payloads, replay old traffic, or block delivery by exhausting storage or disrupting forwarding rules. Defenders often use encryption, message authentication, access controls, and retention limits to reduce that exposure. The core challenge is balancing resilience against the added trust placed in each relay.