https://community.nxp.com/t5/MCX-Microcontrollers/NXP-DIE-DICE-UDS-MK-SK-in-ELS-key-slots-on-MCXN947/m-p/2356317#M5298 <P>Hello,</P><P>I want to use&nbsp;<STRONG>NXP_DIE_DICE_UDS_MK_SK</STRONG> as input key of HKDF to derive the secret on MCXN947.<BR />But, secure reference manual doesn't describe precise slot number of it.<BR />I found some other keys like NXP_DIE_MK_SK in&nbsp;9.9 ELS key store state after boot.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="YosukeW_2-1777270518788.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/383618i918CF1AB6E1F07E3/image-size/medium?v=v2&amp;px=400" role="button" title="YosukeW_2-1777270518788.png" alt="YosukeW_2-1777270518788.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="YosukeW_1-1777270461387.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/383617i53AFF028A34053AE/image-size/medium?v=v2&amp;px=400" role="button" title="YosukeW_1-1777270461387.png" alt="YosukeW_1-1777270461387.png" /></span></P><P>Could you please tell me it ?</P><P>Thank you and Best regards, Yosuke</P> Mon, 27 Apr 2026 06:16:05 GMT YosukeW 2026-04-27T06:16:05Z https://community.nxp.com/t5/MCX-Microcontrollers/NXP-DIE-DICE-UDS-MK-SK-in-ELS-key-slots-on-MCXN947/m-p/2356317#M5298 <P>Hello,</P><P>I want to use&nbsp;<STRONG>NXP_DIE_DICE_UDS_MK_SK</STRONG> as input key of HKDF to derive the secret on MCXN947.<BR />But, secure reference manual doesn't describe precise slot number of it.<BR />I found some other keys like NXP_DIE_MK_SK in&nbsp;9.9 ELS key store state after boot.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="YosukeW_2-1777270518788.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/383618i918CF1AB6E1F07E3/image-size/medium?v=v2&amp;px=400" role="button" title="YosukeW_2-1777270518788.png" alt="YosukeW_2-1777270518788.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="YosukeW_1-1777270461387.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/383617i53AFF028A34053AE/image-size/medium?v=v2&amp;px=400" role="button" title="YosukeW_1-1777270461387.png" alt="YosukeW_1-1777270461387.png" /></span></P><P>Could you please tell me it ?</P><P>Thank you and Best regards, Yosuke</P> Mon, 27 Apr 2026 06:16:05 GMT https://community.nxp.com/t5/MCX-Microcontrollers/NXP-DIE-DICE-UDS-MK-SK-in-ELS-key-slots-on-MCXN947/m-p/2356317#M5298 YosukeW 2026-04-27T06:16:05Z https://community.nxp.com/t5/MCX-Microcontrollers/NXP-DIE-DICE-UDS-MK-SK-in-ELS-key-slots-on-MCXN947/m-p/2359185#M5312 <P>Hello&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/262019">@YosukeW</a>&nbsp;</P> <DIV>Yes, the MCXN947 Security Reference Manual does not cover this topic. I will confirm with our internal team and update you as soon as I have any new information.</DIV> <DIV>Thank you.</DIV> <P>&nbsp;</P> <P>BR</P> <P>Alice</P> Thu, 30 Apr 2026 09:36:16 GMT https://community.nxp.com/t5/MCX-Microcontrollers/NXP-DIE-DICE-UDS-MK-SK-in-ELS-key-slots-on-MCXN947/m-p/2359185#M5312 Alice_Yang 2026-04-30T09:36:16Z