qrypt0 - encrypted short messages exchanged between offline computers

TL;DR

qrypt0 enables secure exchange of encrypted messages between offline computers using QR codes, leveraging physical isolation and cryptography to prevent malware and network-based attacks.

Contribution

It introduces a novel method for secure message transfer between air-gapped computers using QR codes, emphasizing physical isolation over traditional security measures.

Findings

Effective protection against malware and network attacks.

Secure message exchange without network connectivity.

Relies on cryptography and physical isolation for security.

Abstract

A system is described for exchanging encrypted short messages between computers which remain permanently isolated from any network accessible to the attacker. The main advantage is effective protection of these computers from malware which could circumvent the encryption. For transmission, the ciphertext is passed between isolated and connected computers in the form of a QR code, which is displayed on and scanned from a screen. The security of qrypt0 therefore rests on the cryptography and the computer's physical isolation rather than on the computer security of the encrypting device.