Nitrokey Pro 2 by Nitrokey is a USB security device designed to protect emails, files, hard drives, server certificates, and online accounts using cryptography. It securely stores private keys in tamper-resistant hardware, preventing theft and unauthorized access. Nitrokey Pro 2 is PIN-protected and secured against brute force and hardware attacks. It supports OpenPGP/GnuPG email encryption, encrypted mass storage, hidden volumes, and PKI/CA management features.