Decoding puzzle

[Phil-T4]

Well it did help that some other systems on the 75 use a similar form of encoding

[Anthony & Maricel]

Ohh I see you augment standard hex for the hex table to convert numbers and letters to a ASCII format.

[maintenanceman]

Originally Posted by Phil-T4

I'm feeling pretty pleased with myself as it only took me 3 hours to work this out..

Here is your challenge if you wish to accept it

Here are two encoded VIN numbers that i read from different EWS ecu's.

1C29B6D371D64B0CD088241041
1C29B6D345544C896046084046

Here are the decoded VIN's for the above

SARRJSTPB3D289111
SARRJHLHCYM162416

How is it done?

Good Luck
Phil

Interesting solution!

They are always advertising for code breakers at that big doughnut shaped building here in Cheltenham if you fancy a career/job change!

[Mark2000cc]

I worked it out straight away, I just didn't want to make you all look silly

[Avulon]

Still can't get this to work all the way through, I follow up to SAR and then depending what I do I can get the next R or going a different way not get the next R but get the J correct, I can't get anything beyond that right

[Phil-T4]

Does this help?

   public byte[] find_VIN(byte[] EWS_image)
        {
            byte[] sbPtr = new byte[17];
            sbPtr[0] = vindecode.KeyQuery(EWS_image[0]);
            sbPtr[1] = vindecode.KeyQuery(Convert.ToByte(EWS_image[1] / 0x04));
            sbPtr[2] = vindecode.KeyQuery(Convert.ToByte((EWS_image[1] % 0x04 * 0x10) + (EWS_image[2] / 0x10)));
            sbPtr[3] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[3] / 0x10) + (EWS_image[2] % 0x10 * 0x10)) / 0x04));
            sbPtr[4] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[3] / 0x10) % 0x04) * 0x10) + (EWS_image[3] % 0x10 % 0x10)));
            sbPtr[5] = vindecode.KeyQuery(Convert.ToByte(EWS_image[4] / 0x04));
            sbPtr[6] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[5] / 0x10) + (EWS_image[4] % 0x04) * 0x10)));
            sbPtr[7] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[6] / 0x10) + (EWS_image[5] % 0x10 * 0x10)) / 0x04));
            sbPtr[8] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[6] / 0x10) % 0x04) * 0x10) + (EWS_image[6] % 0x10)));
            sbPtr[9] = vindecode.KeyQuery(Convert.ToByte(EWS_image[7] / 0x04));
            sbPtr[10] = vindecode.KeyQuery(Convert.ToByte((EWS_image[7] % 0x04 * 0x10) + (EWS_image[8] / 0x10)));
            sbPtr[11] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[8] % 0x10 * 0x10) + (EWS_image[9] / 0x10)) / 0x04));
            sbPtr[12] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[9] / 0x10) % 0x04) * 0x10) + (EWS_image[9] % 0x10)));
            sbPtr[13] = vindecode.KeyQuery(Convert.ToByte(EWS_image[10] / 0x04));
            sbPtr[14] = vindecode.KeyQuery(Convert.ToByte((EWS_image[10] % 0x04 * 0x10) + (EWS_image[11] / 0x10)));
            sbPtr[15] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[11] % 0x10 * 0x10) + (EWS_image[12] / 0x10)) / 0x04));
            sbPtr[16] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[12] / 0x10) % 4) * 0x10) + (EWS_image[12] % 0x10)));
            Program.ews_vin = System.Text.Encoding.Default.GetString(sbPtr);
            return sbPtr;
            }

[Anthony & Maricel]

Originally Posted by Avulon

Still can't get this to work all the way through, I follow up to SAR and then depending what I do I can get the next R or going a different way not get the next R but get the J correct, I can't get anything beyond that right

Use this table to decode the vin data, the key is to add, multiply and divide in Hex.

1C 29 B6 D3 71 D6 4B 0C D0 88 24 10 41
1C 29 B6 D3 45 54 4C 89 60 46 08 40 46

Hex Let
0A= A
0B= B
0C= C
0D= D
0E= E
0F= F
10= G
11= H
12= I
13= J
14= K
15= L
16= M
17= N
18= O
19= P
1A= Q
1B= R
1C= S
1D= T
1E= U
1F= V
20= W
21= X
22= Y
23= Z

[Avulon]

Got it now, I hadn't appreciated that the encoding pattern repeated every 4 characters (not counting the very first ), I was assuming that it progressed, using pairs of input bytes.

i.e.

0 = 0
1 = 1/4
2 = 1 and 2
3 = 2 and 3
4 = 3 and 4
5 = 4 and 5 ...
and so on

Cheers.

[Conni]

Originally Posted by Phil-T4

Does this help?

   public byte[] find_VIN(byte[] EWS_image)
        {
            byte[] sbPtr = new byte[17];
            sbPtr[0] = vindecode.KeyQuery(EWS_image[0]);
            sbPtr[1] = vindecode.KeyQuery(Convert.ToByte(EWS_image[1] / 0x04));
            sbPtr[2] = vindecode.KeyQuery(Convert.ToByte((EWS_image[1] % 0x04 * 0x10) + (EWS_image[2] / 0x10)));
            sbPtr[3] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[3] / 0x10) + (EWS_image[2] % 0x10 * 0x10)) / 0x04));
            sbPtr[4] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[3] / 0x10) % 0x04) * 0x10) + (EWS_image[3] % 0x10 % 0x10)));
            sbPtr[5] = vindecode.KeyQuery(Convert.ToByte(EWS_image[4] / 0x04));
            sbPtr[6] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[5] / 0x10) + (EWS_image[4] % 0x04) * 0x10)));
            sbPtr[7] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[6] / 0x10) + (EWS_image[5] % 0x10 * 0x10)) / 0x04));
            sbPtr[8] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[6] / 0x10) % 0x04) * 0x10) + (EWS_image[6] % 0x10)));
            sbPtr[9] = vindecode.KeyQuery(Convert.ToByte(EWS_image[7] / 0x04));
            sbPtr[10] = vindecode.KeyQuery(Convert.ToByte((EWS_image[7] % 0x04 * 0x10) + (EWS_image[8] / 0x10)));
            sbPtr[11] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[8] % 0x10 * 0x10) + (EWS_image[9] / 0x10)) / 0x04));
            sbPtr[12] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[9] / 0x10) % 0x04) * 0x10) + (EWS_image[9] % 0x10)));
            sbPtr[13] = vindecode.KeyQuery(Convert.ToByte(EWS_image[10] / 0x04));
            sbPtr[14] = vindecode.KeyQuery(Convert.ToByte((EWS_image[10] % 0x04 * 0x10) + (EWS_image[11] / 0x10)));
            sbPtr[15] = vindecode.KeyQuery(Convert.ToByte(((EWS_image[11] % 0x10 * 0x10) + (EWS_image[12] / 0x10)) / 0x04));
            sbPtr[16] = vindecode.KeyQuery(Convert.ToByte((((EWS_image[12] / 0x10) % 4) * 0x10) + (EWS_image[12] % 0x10)));
            Program.ews_vin = System.Text.Encoding.Default.GetString(sbPtr);
            return sbPtr;
            }

Hello Phil and All,

to the code-script I have two questions.

1.) In the line sbPtr[4] is writen at the end % 0x10 % 0x10
Is this correct or is there a typing mistake ?

2.) In the line sbPtr[16] is writen % 4
I think it should be % 0x04 otherwise the computer will not know
that it is a hexadecimal number.

It can of course also be a mistake on my part. What do you think of that ?
I wait with interest for an answer to this.

Best wishes to All

Conni

[Phil-T4]

1.) In the line sbPtr[4] is writen at the end % 0x10 % 0x10
Is this correct or is there a typing mistake ?

Correct

2.) In the line sbPtr[16] is writen % 4
I think it should be % 0x04 otherwise the computer will not know
that it is a hexadecimal number.

Doesn't matter, decimal 4 is the same as hex 4, the compiler doesn't care how its written but to keep it neat then yes it should have been written as 0x04