Smart Cards and Secure ElementのトピックRe: Secure element transcript attestation

Secure element transcript attestation

damip — Mon, 15 Dec 2025 08:37:51 GMT

Hello,

I currently use the SE050 and I would like to attest a digest of the history of all host-chip communications since the start of the session in order to reduce trust requirements in the host.

I understand that the SE050 does not have this capability, and I am looking for alternatives that might allow this.

As a fallback, I found that the SE051P allows custom java card applets to be installed but I don't know what would be the exact process to build a prototype.

Thank you for your help.

Re: Secure element transcript attestation

carlos_o — Mon, 15 Dec 2025 18:29:59 GMT

Hi @damip

Thanks for your post

The SE05x family does not have the capability to get history of the host-chip communication, this could be accomplished in the host but is up to your own implementation.

For detail information about custom applets pf the SE051 please contact your local NXP representative.

Re: Secure element transcript attestation

msjcard — Sun, 28 Dec 2025 23:12:55 GMT

You could stack them. E.g. Use the "outside" SE05x as the pass-through digester. I *think* it would work if you just used that Outside chip as an I2C master for an "inside" chip doing the actual work. I believe the inside<-> outside I2C messages can be digested and signed in each direction.

I haven't actually looked deeply at the SE05x data to verify approach, but my readings of the documents a year or so ago suggest this is possible.