Title: VAG Terminology: pincode, SKC, CS bytes ? Post by: H2Deetoo on December 03, 2014, 03:16:57 AM Hi guys,
It seems the terms pincode, SKC, CS bytes are used by many people to describe the same thing: gaining security access to an ECU. Can someone explain exactly what they are and how the differ from eachanother ? (And how they are used in the underlying protocol?) This is what I've gathered so far: Pincode is a 4 or 5 digit value, which was originally used to gain access to an ECU. In the KWP2000/UDS protocol, when the seed is received (27 xx, 67 xx) then the pinvalue is ADDED, and the new value is sent back as the key (27 xx+1). To gain a different security access level a more complex algo is used, not a simple addition. When entering the pincode in VCDS, this simple addition is done. Then later VAG introduced the SKC value (7 digits) which is encapsulates the original pincode, and a workshopcode and a date. So it is my understanding that if you have a SKC value and you know the corresponding wsc and date, then you can retreive the original pin value again? What are CS (component security?) bytes and how are they used? I read they are 8 bytes, and the 8th byte is always fixed? Thanks for any answers, H2Deetoo Title: Re: VAG Terminology: pincode, SKC, CS bytes ? Post by: H2Deetoo on December 03, 2014, 04:19:38 AM You can read about the VCDS pincode being a simple ADDITION here:
http://nefariousmotorsports.com/forum/index.php?topic=4983.0 |