Application Note "Security Access"

This document describes what security DLLs are (Seed & Key DLLs), how to implement them and which tools support the different APIs.

Security DLLs are customer provided DLLs, which are used to calculate a key for changing the security level of an ECU with a diagnostic tester. For common diagnostic protocols, service $27 is used to change the security level in order to unlock other services with restricted access. Typically, the ECU sends a seed as a response for the diagnostic tester’s request for security access. The client then computes a corresponding “key” for the seed and unlocks the ECU using this key. The document describes in detail which interfaces are available and shall be used for specific use cases.

Application Note AN-IDG-1-017


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