Knowledge Base Frequently Asked Questions YubiHSM 1 What is the YubiHSM 1? Is the YubiHSM 1 for symmetric encryption only? Is the YubiHSM 1 security certified (FIPS 140 or similar)? Is the YubiHSM protected against physical intrusion? Are YubiHSM keys deleted on intrusion events? Is the YubiHSM internal CPU a designated security CPU or just an ordinary COTS one? Why does the YubiHSM 1 use a USB CDC rather than a custom driver? The YubiHSM USB interface is only full-speed. Why not high-speed? Why is the YubiHSM 1 internal key storage set to just 1024 entries? Can the YubiHSM 1 device firmware be upgraded via USB (otherwise known as DFU)?