Reply To: 3DES authentication timeout

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Re: 3DES authentication timeout

8. March 2016 at 16:11
Hi Christophe,

If you have to do the authentication calculation outside of your device you always have to deal with (possible) long replies and “service not available conditions” because of connection problems.

In your case I would prefer a solution where I use time limited credentials which you can load once to your mobile device and which are valid only for one day. I can also imagine to work with diversified keys which depends for instance on the UID of the card or tag. Then you can read the UID of the device and ask the server instance for the unique key for this tag. When you get the key you can start the authentication locally. The diversified key is generated from a master key together with a constant which is unique to the card. This is the UID and the generated diversified key is unique for the tag with the given UID.

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