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Title: Encryption Levels Post by: TheDECODER on October 19, 2021, 02:20:08 PM Working on flashing via UDS
Through the UDS I see Encryption 1 and Encryption 2 being used. How can I find out what encryption these are? Title: Re: Encryption Levels Post by: TheDECODER on October 19, 2021, 02:25:34 PM Working on flashing via UDS Through the UDS I see Encryption 1 and Encryption 2 being used. How can I find out what encryption these are? Also Compression 1 and Compression 2 Title: Re: Encryption Levels Post by: d3irb on October 19, 2021, 03:22:50 PM These are not the same across different control modules from different vendors. Your best bet is to search for specifically that control module, post about what you are actually trying to do (what control module? what are you trying to flash?), or disassemble the firmware for that control module and take apart the UDS routines.
Here are some examples: DQ250-MQB ("encryption 1, compression 1"): Encryption 1 is a rolling byte substitution cipher, Compression 1 is LZSS. http://nefariousmotorsports.com/forum/index.php?topic=6583.msg148045#msg148045 Simos12 / Simos18 ("encryption A, compression A"): Encryption A is AES with a fixed key/IV per ECU "project" (SC8, SCG, etc.), Compression A is again LZSS. http://nefariousmotorsports.com/forum/index.php?topic=10364.msg142085#msg142085 MED9.1: Fixed-key XOR: http://nefariousmotorsports.com/forum/index.php?topic=4983.msg51798#msg51798 In most Bosch control modules, I believe "encryption 1" is usually fixed-table/fixed-key XOR and "encryption A" is usually AES, but as you can tell, this is not a hard rule. Title: Re: Encryption Levels Post by: TheDECODER on October 20, 2021, 08:24:09 AM These are not the same across different control modules from different vendors. Your best bet is to search for specifically that control module, post about what you are actually trying to do (what control module? what are you trying to flash?), or disassemble the firmware for that control module and take apart the UDS routines. My apologies. Should have given more info. The UDS shows: UDS Request Service: Request data download (from PC to ECU) Compression Type: 1 The ECU label is a Continental Siemens VDO and the control module is a TCU labeled as VGSNAG. Also have another ECU I am working on, Audi MED17 which using a Compression A and Encryption 2 Appreciate the assistance! :) Title: Re: Encryption Levels Post by: prj on October 20, 2021, 09:32:09 AM You realize that on most control units there is a signature check right?
So you can only flash signed software OR you need a bypass. Title: Re: Encryption Levels Post by: TheDECODER on October 20, 2021, 11:50:28 AM You realize that on most control units there is a signature check right? So you can only flash signed software OR you need a bypass. Yes I have the signature as well :) |