Vida CEM swapping

[oscilloscope]

You are taking the hard approach to learning programming, I've been there waaay way back in 2007 and then later on in 2011 with C then with Java(Android flavor).

I also very long ago, wrote an Android program...on my phone when I had no access to a PC. https://bitcointalk.org/index.php?topic=101612.0 it was one of my more ambitious projects at the time but with enough patience the code will, one way or another, start making sense.

My most recent ambitious project was writing my own control flow graph generator in Java(in order to re-learn java as I had not used it for over 8 years!), it worked semi-ok. But semi-ok because I tested it on obfuscated code.

Point is, trial&error on some things. It's not efficient, but everyone has a way of learning things.

certainly do , that is why i' using chatgpt i know its not prefect , and i know the code isn't going to work , but i save ones that almost do and then i edit it where i think its going to work , and i have got really close but the code on here doesn't really work on python. it doesn't understand what the ^ (i // 7) is ment to mean , if i remove it entirely from the code and use a XOR cipher and then implement a crypto key array , of 0x3d, 0x55, 0x7f, 0x9d, 0xa5, 0xbb, 0xc3, 0xdf, 0xe it gets super close , but still not dice! , I'm going to pack it in for tonight. its already close 1pm here

[coormis]

Are you talking about the 120 ohm resistor on the SN65HVD230?

By the way, the latency numbers in your log are totally off, they make no sense. That's why I suspected the hw implementation.

I cheked today my shield. its no jumper, its connected directly to vp230 6,7 pin. 120 omh resistor i removed from shield. maybe china chips is broken.

[oscilloscope]

Are you talking about the 120 ohm resistor on the SN65HVD230?

By the way, the latency numbers in your log are totally off, they make no sense. That's why I suspected the hw implementation.

I cheked today my shield. its no jumper, its connected directly to vp230 6,7 pin. 120 omh resistor i removed from shield. maybe china chips is broken.

I made mine with similar parts, I have had mixed success , as I try it on most cems I get in I think why not "have ago and see if it works "

I have the alternative CAN transceivers rick suggested to use in the github repo ? & the pcbway boards but haven't actually put them together as of yet. Have you looked up the alternative board ?

[coormis]

By the way, the latency numbers in your log are totally off, they make no sense. That's why I suspected the hw implementation.

I cheked today my shield. its no jumper, its connected directly to vp230 6,7 pin. 120 omh resistor i removed from shield. maybe china chips is broken.

I made mine with similar parts, I have had mixed success , as I try it on most cems I get in I think why not "have ago and see if it works "

I have the alternative CAN transceivers rick suggested to use in the github repo ? & the pcbway boards but haven't actually put them together as of yet. Have you looked up the alternative board ?

i try search in my country alternative shields. and if its wonts work, i try pcbway board.

[oscilloscope]

I have been attempting too use the XOR decrypt on some cem eeprom files, so far with little success. It either doesn't perform the task , or preforms it completely incorrectly.

[rkam]

Your key should be 61 (0x3d) bytes long.

out[0] = ( data[0] xor key[0] ) xor 0
out[1] = ( data[1] xor key[1] ) xor 0
out[2] = ( data[2] xor key[2] ) xor 0
out[3] = ( data[3] xor key[3] ) xor 0
out[4] = ( data[4] xor key[4] ) xor 0
out[5] = ( data[5] xor key[5] ) xor 0
out[6] = ( data[6] xor key[6] ) xor 0
out[7] = ( data[7] xor key[7] ) xor 1
..
out[13] = ( data[13] xor key[13] ) xor 1
out[14] = ( data[14] xor key[14] ) xor 2
...
out[60] = ( data[60] xor key[60] ) xor 8
out[61] = ( data[61] xor key[0] ) xor 8
out[62] = ( data[62] xor key[1] ) xor 8
out[63] = ( data[63] xor key[2] ) xor 9
..
out[1791] = ( data[1791] xor key[22] ) xor 255
out[1792] = ( data[1792] xor key[23] ) xor 0


Key number starts from 0 every 61 bytes
Xor value from byte number starts from 0 after 1792 bytes (255 used 7 times)

[oscilloscope]

Your key should be 61 (0x3d) bytes long.

out[0] = ( data[0] xor key[0] ) xor 0
out[1] = ( data[1] xor key[1] ) xor 0
out[2] = ( data[2] xor key[2] ) xor 0
out[3] = ( data[3] xor key[3] ) xor 0
out[4] = ( data[4] xor key[4] ) xor 0
out[5] = ( data[5] xor key[5] ) xor 0
out[6] = ( data[6] xor key[6] ) xor 0
out[7] = ( data[7] xor key[7] ) xor 1
..
out[13] = ( data[13] xor key[13] ) xor 1
out[14] = ( data[14] xor key[14] ) xor 2
...
out[60] = ( data[60] xor key[60] ) xor 8
out[61] = ( data[61] xor key[0] ) xor 8
out[62] = ( data[62] xor key[1] ) xor 8
out[63] = ( data[63] xor key[2] ) xor 9
..
out[1791] = ( data[1791] xor key[22] ) xor 255
out[1792] = ( data[1792] xor key[23] ) xor 0


Key number starts from 0 every 61 bytes
Xor value from byte number starts from 0 after 1792 bytes (255 used 7 times)

Thanks I will give that a try. And report back

[eastcoasttuningltd]

Looking for a place to order CY1076 I got the rest of the parts trying to build the cracker

[vtl]

Looking for a place to order CY1076 I got the rest of the parts trying to build the cracker

You don't need level shifters to build a cracker.

[RickHaleParker]

You don't need level shifters to build a cracker.

I have done the CAN level at 5V ... no damage.
If you want to level shift. Use a CAN Transceiver with level shift built in.