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Key Diversification Data

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ngana
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Key Diversification Data

Post by ngana » Tue Jun 06, 2017 3:40 am

As we all know, the key diversification data is used to derive the session keys. And it is returned by init-update APDU. However, now I have a question. Does it make sense to generate the diversification data randomly for each session using RandomData class?
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mabel
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Re: Key Diversification Data

Post by mabel » Wed Jun 07, 2017 4:25 am

AFAIK, key diversification data is used to derive the card static keys, not the session keys. So basically, it's to some extent a standard known only by the Card Issuer.
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Tarantino
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Re: Key Diversification Data

Post by Tarantino » Wed Jun 07, 2017 5:49 am

You can try the command "80 50 00 00 08" (8 bytes of card challenge), you will see the response returned by the card with the first 10 bytes remains always the same. It's the key diversification data.
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