The recent document – NIST Special Publication 800-63B, Digital Identity Guidelines, Authentication and Lifecycle Management dated June 2017 makes interesting reading – it places out of band (SMS messages) in the lowest category of Authentication Assurance Levels with OTP only slightly better.
CASQUE SNR easily fulfils the criteria of a “Multi-factor Hardware Crypto Device” as defined in NIST 800-63B and so is able to be employed for applications demanding the highest assurance level without requiring multiple other methods. It is the only Multi-factor Authentication product certified by UK’s NCSC as suitable for secret.
If you would like a detailed exposition of the weakness of existing MFA techniques just use the contact form.