Where is the AN4024 application note ?

[JulienD]

Posted on October 27, 2015 at 19:25

Hi,

I've just douwnloaded the software from this page : http://www.st.com/web/en/catalog/tools/FM147/CL1794/SC961/SS1743/LN1734/PF257935 Its release_notes file deals with

AN4024 ''STM32 secure firmware upgrade (SFU)''

. But I can't find this document anywhere. Do anybody have it or can tell me where it can be found ? Regards Julien #an4024

[Tesla DeLorean]

Posted on October 27, 2015 at 19:32

Call and speak to your local ST sales rep or FAE.

[Nesrine M_O]

Posted on October 28, 2015 at 11:06

Hi Julien,

As suggested by Clive1, please contact your local distributor or FAE to get the application note document.-Syrine-

[e1369008]

Posted on October 28, 2015 at 12:09

It's interesting though why it's not available to general public. Security through obscurity? If the method's security depends on the information in that document then the method is not secure, otherwise, why isn't the document available?

As for the case, it's really easy for somebody who understand cryptography to create secure firmware update functionality (with authentication) using asymmetric encryption like elliptic curves (for authentication and block cipher key encryption) and any decent block cipher like AES. But if you don't understand cryptography, you will make mistakes.

[Tesla DeLorean]

Posted on October 28, 2015 at 12:17

It's more probably a business/control issue, or to meet regulatory requirements.