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Duo does work as advertised, and my uni uses it, but the privacy policy allows for a lot of personal data collection.

tldr: "Duo Security does not sell, rent, or trade and, except as described in this Privacy Policy, does not share any Personal Information with third parties for their promotional purposes." But Duo still collects A LOT of data on you.

From the policy: "Device-Specific Information: We also collect device-specific information (e.g. mobile and desktop) from you in order to provide the Services. Device-specific information includes:

attributes (e.g. hardware model, operating system, web browser version, as well as unique device identifiers and characteristics (such as, whether your device is “jailbroken,” whether you have a screen lock in place and whether your device has full disk encryption enabled)); connection information (e.g. name of your mobile operator or ISP, browser type, language and time zone, and mobile phone number); and device locations (e.g. internet protocol addresses and Wi-Fi). We may need to associate your device-specific information with your Personal Information on a periodic basis in order to confirm you as a user and to check the security on your device."

The policy continues to state that Duo may use this data for analytic/advertising purposes (although only in-house) as well as to comply with legal requests, subpoenas, NSLs etc.

Duo isn't collecting your data for nefarious purposes or to sell it to other companies but they still are collecting A LOT of it. Other two factor methods, like the one's used by Google and Facebook, allow clients to install their own code generators that don't collect personal data or even need access to the internet. Of course these methods don't have push requests that you can just approve rather than type in the code.




also, if it's a US company and it ever goes bankrupt/sells its assets, third party buyers aren't bound by any privacy policy whatsoever. yes, this is crazy and it means US privacy policies are basically meaningless; best just don't give them your data, but what can you do. personally I believe that collecting the data and pretending a privacy policy makes it okay, is nefarious by itself already.


I think that's a fair read. The primary use of that data is for security use cases. Eg. if you're coming from an out-of-date browser or have risky Java/Flash plugin versions, we can notify you to update/remediate.

Another way to look at it: We collect security-relevant information on your device, but not your _personal_ data. In other words, we don't collect your email, photos, contacts, user-generated data, etc.




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