Cryptography (IMAGE) Optica Caption In device-independent cryptography, the required trust is much smaller (indicated by the smaller yellow boxes). Here, security is guaranteed even if Alice and Bob's devices do not work according to their specifications. Credit Credit: Renato Renner. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.