Google's decision to do this with in a microSD form factor has good reasoning. Simply put, data and storage. Project Vault comes with 4GB of onboard storage, and it's small enough to be used in any device you own that has a microSD card slot. It's essentially its own little self-sustained computer. The processor on the device is an ARM RTOS running Google's security-focused, real-time operating system. It also comes with an NFC chip and antenna to ensure authorization. Other cryptographic services include hashing, signing, batch encryption, and a hardware random number generator, says Tech Crunch.
Google Launches Project Vault, a Secure MicroSD with NFC
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