Remote attestation is a cryptographic proof that a remote system is running the expected software inside a trusted environment, such as a secure enclave or confidential-computing workload. The verifier checks measurements like boot state, code hashes, or platform claims before deciding whether to trust the machine. If the proof passes, the system may release secrets, keys, or sensitive data.
This matters because modern attacks often target the runtime where data is decrypted and processed, not the cipher itself. Attestation helps defenders reduce that risk by ensuring secrets are only exposed to genuine workloads, not to tampered hosts, emulators, or look-alike environments. In real defenses, it is used to gate access to encryption keys, protect in-use data, and enforce trust boundaries across clouds or edge systems. If attestation is weak or skipped, an attacker who controls the platform can impersonate a trusted enclave and steal secrets.