We've recently implemented OTP for our user portal for admins.
We are seriously impressed at how easy it was to do and the way it works. Rather than carry a hardware token around, we're using Sophos's own authenticator and it works brilliantly with multiple tokens eg two different UTM's using AD authentication & OTP
The scan barcode idea is brill, it has you set up within seconds and the fact that it is on a phone gives you an added level of security.
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