This question explains how authenticators like Google Authenticator and Authy are able to generate one-time passwords without connecting to a server.

Are there any patents preventing someone from implementing this in their own app? There is a conspicuous lack of authenticators besides the above two, and that makes me worry.

Additionally, if there are some patents that a basic implementation would be infringing on (such as possibly this one from 2014?), how does one go about getting a license on FRAND terms from the patent holders?

  • Your "this one" link is to an application that resulted in an issued patent patents.google.com/patent/US8973114B2/en. Scrolling down, you will see dozens of patents it cites and dozens more that later cited it. Looks like a very active field with a lot of IP. – George White Mar 23 '18 at 18:37
  • There are probably many patents to be aware of. FRAND licensing is generally only available for patents that are a part of a standard. Any way, licensing is off topic. – Eric Shain Mar 23 '18 at 21:36

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