Vida CEM swapping

Post by **vtl** » 07 May 2021, 12:22

RickHaleParker wrote: 07 May 2021, 12:20
vtl wrote: 07 May 2021, 12:14 Does it hang with master?
I got the impression you pushed the change in Master. Is Master or Rework where you pushed the Lowest_std change?

lowest_std branch. Do "git pull" & "git checkout lowest_std" in your git clone, or, if no git, click on the branch button in github web ui and select the lowest_std branch.

Post by **RickHaleParker** » 07 May 2021, 12:30

vtl wrote: 07 May 2021, 12:22 lowest_std branch. Do "git pull" & "git checkout lowest_std" in your git clone, or, if no git, click on the branch button in github web ui and select the lowest_std branch.

Found it. Will run it later.

Playing with new toys right now.

solitaire · Post by **solitaire** » 07 May 2021, 12:37

vtl wrote: 07 May 2021, 12:14
Does it hang with master?

yes, master ant lowest_std
old work always

Post by **vtl** » 07 May 2021, 12:47

Ok, so autodetect does not work. Interestingly, it worked for me with the your dump couple of days ago.

Post by **vtl** » 07 May 2021, 13:08

Pushed workaround to the lowest_std branch.

solitaire · Post by **solitaire** » 08 May 2021, 03:46

vtl for me OLD code is best
I found best sample is from 9 - 20 and first two bytes always correct and 3 bytes is in list from 1 to 5
can you add to OLD code:
if pin not found try
bruteforce again with first two and next candidate (3) from list
I think it will be great variant

Post by **vtl** » 08 May 2021, 07:59

This approach will not work. I wrote a couple of times about my observations on "difficult" bytes. It simply won't work.

solitaire · Post by **solitaire** » 08 May 2021, 09:42

deleted

Post by **RickHaleParker** » 08 May 2021, 10:24

solitaire wrote: 08 May 2021, 03:46 bruteforce again with first two and next candidate (3) from list
I think it will be great variant

If selected candidates B0 - B3 fail and it is known B0 and B1 have high integrity. Could brute force B3 - B6 as a second try. Brute forcing four bytes could take up to 1.6 hours but that is a lot less time then Vdash cracking a P3. It would not be desirable but would be acceptable to end users. ( If one can accept up to 24 hours, one can accept ~ 2 hours time ) .

If going this route, an abort option that will also reset the CEMs would be a nice feature.

solitaire · Post by **solitaire** » 08 May 2021, 12:22

today tested with different voltage from power supply
14V from labor power supply: 3 times - 3 correct result with sample 9
11V from labor power supply: 3 times - 3 incorrect 3 bytes, but 3 bytes always in candidate 1-5

vtl please add to OLD code:
if PIN not found, try 3 byte next candidate
or please add additional code simple bruteforce if known 3 bytes,
thanks!