Air-Gapped Devices

Air-gapped devices are computers or hardware wallets that have no physical or wireless connection to the internet or other untrusted networks. This isolation is a powerful security measure, as it prevents remote access, malware communication, and data exfiltration.

In a crypto context, an air-gapped machine is used to sign transactions that are then transferred via a secure medium like a QR code or a USB drive. This ensures that the private key remains entirely protected from the outside world.

It is the gold standard for high-security storage of private keys. Even if the device is infected with malware, the lack of network connectivity makes it impossible for an attacker to steal the keys.

Maintaining an air-gap requires strict operational procedures to prevent the accidental introduction of untrusted data. It is a fundamental technique for long-term cold storage.