topic Re: S32K Csec Module in S32K

S32K Csec Module

wanglijun — Mon, 25 Jan 2021 01:44:34 GMT

Hello,

I have a question about the CSEC module:

In the CSEC module, there are some user keys, is it possible to change only one key value to FF, other keys not changed?

Thank you!

lukaszadrapa — Mon, 25 Jan 2021 09:02:49 GMT

Hi,

yes, it is possible to update one key only.

Take a look at section 4.2.2 Updating key. SW example is also included.

Regards,

Lukas

wanglijun — Thu, 28 Jan 2021 01:06:13 GMT

Hello,

Thank you for the reply.

I have another question: If one key value is updated to FF with all the bytes.

Is it possible by csec?

Thank you!

lukaszadrapa — Thu, 28 Jan 2021 07:30:14 GMT

There are no restrictions given by CSEc module and by SHE specification. Any value can be used.

Regards,

Lukas

wanglijun — Thu, 28 Jan 2021 07:36:40 GMT

Hello,

Thank you for the feedback.

About the security debug, there is limit for the backdoor key. All 0s or all 1s cannot be used as the backdoor key value.

So they are different about the application rule.

wanglijun — Thu, 28 Jan 2021 07:41:04 GMT

Hello,

Thank you for the feedback.

I see the security debug, there is limit for the backdoor key. All 0s or all 1s cannot be used as the backdoor key value.

So there is different application rule.