| YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
Availability |  |  |  |  |
USB authentication key, including strong crypto and touch-to-sign, plus One-Time-Password, smart card, and four form factors |
Size | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
| 18mm x 45mm x 3.3mm, 3g | 12mm x 13mm x 3.1mm, 1g | 12.5mm x 29.5mm x 5mm, 2g | 12mm x 10.1mm x 7mm, 1g |
YubiKey Tools | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
YubiKey Manager | | | | |
Yubico Authenticator | | | | |
Personalization Tool | | | | |
Functions | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
Secure static passwords | | | | |
Yubico OTP | | | | |
OATH – HOTP (Event) | | | | |
OATH – TOTP (Time) | | | | |
Smart card (PIV-Compatible) | | | | |
OpenPGP | | | | |
FIDO U2F (Universal Second Factor) | | | | |
FIDO2 | | | | |
Secure element | | | | |
Top Applications | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
Google Accounts | | | | |
Facebook Accounts | | | | |
GitHub | | | | |
Dropbox | | | | |
Salesforce | | | | |
LastPass Premium password manager | | | | |
Dashlane Premium password manager | | | | |
Many more applications | | | | |
Certifications | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
FIDO U2F Certification™ | | | | |
FIPS 140-2 Certification | | | | |
Communications Support | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
USB-A | | | | |
USB-C | | | | |
NFC (Near Field Communication) | | | | |
Device Type | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
HID Keyboard | | | | |
CCID Smart Card | | | | |
FIDO HID | | | | |
Cryptographic Specifications | YubiKey FIPS | YubiKey Nano FIPS | YubiKey C FIPS | YubiKey C Nano FIPS |
RSA 2048 | | | | |
RSA 4096 (PGP) | | | | |
ECC p256 | | | | |
ECC p384 | | | | |