SET KEY USER instruction

Role

This instruction allows to change the HostCommUserKey if the device uses the ATAES Secure Element to store its authentication keys.

Access condition

Never (permanently disabled after manufacturing). Use the CHANGE KEY instruction instead.

Note

This instruction is permanently disabled when the device exits the factory (by setting bit 2 "Lock Secure Elements" in the Fuses). Once this is done, calling this instruction returns an error.

Command

Field Value
CLA 59 (ATCRYPTO)
INS 10
Data New key value (AES-128 - 16 bytes)