Google's Project Vault computing environment on a micro SD card

Project Vault is a secure computer contained entirely on a micro SD sized device. Google's ATAP said the micro SD format made sense because there's already advanced security features on your phone, contained in the SIM card, which protects the things important to carriers. Vault is designed to be an equivalent, but designed to project a user's important content.Would be fun to play with on my Google Nexus 5.Oh wait.