I cannot send you the official standard since that is copyrighted by SAE but I can tell you that it's a 3 page doc and all it talks about is a very high level functional spec on the seed/key mechanism to secure a ECU and then it states that the relationship between the seed and key is the responsibility of the vehicle manufacturer.
basically the spec will not give you any insight into how to gain access to the ECU...
Thanks
Paul
www.obdpros.com