Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

No solution found :( while previously it did find one for this card #35

Open
devedse opened this issue Oct 25, 2018 · 20 comments
Open

No solution found :( while previously it did find one for this card #35

devedse opened this issue Oct 25, 2018 · 20 comments

Comments

@devedse
Copy link

devedse commented Oct 25, 2018

Hi all,

I've been playing around with NFC cards for a bit and managed to get the keys for a specific card of mine using miLazyCracker: https://github.com/nfc-tools/miLazyCracker/

However, after trying exactly the same attack again on exactly the same NFC card the crypto1_bs tool keeps showing me the message No solution found :(

My log:

Collected 5052 nonces... leftover complexity 8151629441024 (~2^42.89) - press en
Collected 5064 nonces... leftover complexity 8151629441024 (~2^42.89) - press en
Collected 5075 nonces... leftover complexity 8151629441024 (~2^42.89) - press en
Collected 5086 nonces... leftover complexity 8151629441024 (~2^42.89) - press en
Collected 5098 nonces... leftover complexity 222377702350 (~2^37.69) -
initializing brute-force phase...
Starting 8 threads to test 222377702350 states using 128-way bitslicing
Cracking...  99.95%
No solution found :(
MFOC not possible, detected hardened Mifare Classic
Trying HardNested Attack...
libnfc_crypto1_crack ffffffffffff 60 B 4 B mfc_4db3582c_foundKeys.txt
Found tag with uid 4db3582c, collecting nonces for key B of block 4 (sector 1) using known key B ffffffffffff for block 60 (sector 15)
Collected 3543 nonces... leftover complexity 222377702350 (~2^37.69) - initializing brute-force phase...
Starting 8 threads to test 222377702350 states using 128-way bitslicing
Cracking...  37.33%

And this is basically the loop where it gets stuck in. What could be the problem here?
@devedse devedse mentioned this issue Oct 26, 2018
Open
@devedse
Copy link
Author

devedse commented Oct 26, 2018 •
edited
Loading

A workaround for this issue is to start bruteforcing when there's still a lot more complexity left. (somewhere around ~2^42.xxx). It then took a whole night of bruteforcing but it did manage to crack the key.

I think this is not the right solution though.

@aczid
Copy link
Owner

aczid commented Oct 26, 2018

It's true that the craptev1 library doesn't always find a solution, and a workaround is to start the cracker with fewer nonces (a less well-determined system) just like you did.
I believe the improved (GPL) implementation that is part of proxmark3 has tweaked the approach to avoid this situation. I'm hoping somebody will take the time to lift it into a libnfc tool.

With the included .py scripts, it's possible to convert the .txt created by my tool to the .bin format used by the proxmark3 project and to use its host code to crack it. No actual proxmark3 device is required.
I'm afraid that's the best suggestion I can give you.

@devedse
Copy link
Author

devedse commented Oct 29, 2018

You've got an URL to where the proxmark code exists?

@aczid
Copy link
Owner

aczid commented Oct 29, 2018

Here you go https://github.com/Proxmark/proxmark3

@vk496
Copy link

vk496 commented Nov 8, 2018

Hi,

Here some attempts to port the tool from proxmark3: https://github.com/vk496/cropto1_bs

Tried on Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz

Hello, world!
Using AVX2 SIMD core.          
Couldn't read benchmark data. Assuming brute force rate of 120000000 states per second          


          
 time    | #nonces | Activity                                                | expected to brute force          
         |         |                                                         | #states         | time           
------------------------------------------------------------------------------------------------------          
       0 |       0 | Start using 4 threads and AVX2 SIMD core                |                 |          
       0 |       0 | Brute force benchmark: 120 million (2^26,8) keys/s      | 140737488355328 |   14d          
       0 |       0 | Using 0 precalculated bitflip state tables              | 140737488355328 |   14d          
       2 |       0 | Simulating key ddf16ef5882e, cuid 5032b647 ...          | 140737488355328 |   14d          
       2 |     512 | Apply bit flip properties                               | 140737488355328 |   14d          
       2 |    1016 | Apply bit flip properties                               | 140737488355328 |   14d          
       3 |    2025 | Apply Sum property. Sum(a0) = 160                       |    545934278656 | 76min          
       3 |    2522 | Apply bit flip properties                               |    425602908160 | 59min          
       3 |    3008 | Apply bit flip properties                               |    411571159040 | 57min          
       3 |    3504 | Apply bit flip properties                               |    400525623296 | 56min          
       3 |    3991 | Apply bit flip properties                               |    395753291776 | 55min          
       3 |    4475 | Apply bit flip properties                               |    394422452224 | 55min          
       3 |    4947 | Apply bit flip properties                               |    392266022912 | 54min          
       3 |    5426 | Apply bit flip properties                               |    389971083264 | 54min          
       3 |    5902 | Apply bit flip properties                               |    225476575232 | 31min          
       4 |    6375 | Apply bit flip properties                               |    331080335360 | 46min          
       4 |    6828 | Apply bit flip properties                               |    297783984128 | 41min          
       4 |    7288 | Apply bit flip properties                               |    267721441280 | 37min          
       4 |    7748 | Apply bit flip properties                               |    196560551936 | 27min          
       4 |    8193 | Apply bit flip properties                               |    140487049216 | 20min          
       4 |    8634 | Apply bit flip properties                               |    128584802304 | 18min          
       4 |    9076 | Apply bit flip properties                               |    139814567936 | 19min          
       5 |    9510 | Apply bit flip properties                               |    151039918080 | 21min          
       5 |    9955 | Apply bit flip properties                               |    145253875712 | 20min          
       5 |   10387 | Apply bit flip properties                               |    145253875712 | 20min          
       5 |   10823 | Apply bit flip properties                               |    135245537280 | 19min          
       5 |   11243 | Apply bit flip properties                               |    123080974336 | 17min          
       5 |   11660 | Apply bit flip properties                               |    123080974336 | 17min          
       6 |   12064 | Apply bit flip properties                               |    121158918144 | 17min          
       6 |   12476 | Apply bit flip properties                               |    119553794048 | 17min          
       6 |   12895 | Apply bit flip properties                               |    120810610688 | 17min          
       6 |   13298 | Apply bit flip properties                               |    122345545728 | 17min          
       6 |   13712 | Apply bit flip properties                               |    118929686528 | 17min          
       6 |   13712 | (1. guess: Sum(a8) = 224)                               |    118929686528 | 17min          
      34 |   13712 | Apply Sum(a8) and all bytes bitflip properties          |    118929686528 | 17min          
      34 |   13712 | (Test: Key found)                                       |               0 |    0s          
      56 |   13712 | Brute force phase completed. Key found: ddf16ef5882e    |               0 |    0s

Would like to integrate libnfc, and after, into this repo :)

Salu2

@devedse
Copy link
Author

devedse commented Nov 9, 2018

Hey, isn't this using way more nonces though then the current implementation? (Usually it starts bruteforcing at around 3000-4000 nonces)

@vk496
Copy link

vk496 commented Nov 9, 2018

Nop, is only a simulation

@vk496
Copy link

vk496 commented Nov 21, 2018

Hi,

I made some progress with https://github.com/vk496/cropto1_bs. Right now is possible to use it with libnfc readers.

$ ./cropto1_bs 001122334455 0 A 20 B
Hello, world!
Using AVX2 SIMD core.          
Couldn't read benchmark data. Assuming brute force rate of 120000000 states per second          


          
 time    | #nonces | Activity                                                | expected to brute force          
         |         |                                                         | #states         | time           
------------------------------------------------------------------------------------------------------          
       0 |       0 | Start using 4 threads and AVX2 SIMD core                |                 |          
       0 |       0 | Brute force benchmark: 120 million (2^26.8) keys/s      | 140737488355328 |   14d          
       1 |       0 | Using 235 precalculated bitflip state tables            | 140737488355328 |   14d          
       3 |       1 | Apply bit flip properties                               | 140737488355328 |   14d          
       3 |       2 | Apply bit flip properties                               | 140737488355328 |   14d          
       3 |       3 | Apply bit flip properties                               | 140737488355328 |   14d          
       3 |       4 | Apply bit flip properties                               | 127543080386560 |   12d          
       4 |       5 | Apply bit flip properties                               | 125959638351872 |   12d          
       4 |       6 | Apply bit flip properties                               | 112771144351744 |   11d          
       4 |       7 | Apply bit flip properties                               | 102814034427904 |   10d          
       4 |       8 | Apply bit flip properties                               | 102814034427904 |   10d          
       4 |       9 | Apply bit flip properties                               | 102814034427904 |   10d          
       4 |      10 | Apply bit flip properties                               |  53722788921344 |    5d          
       4 |      11 | Apply bit flip properties                               |  53722788921344 |    5d          
       4 |      12 | Apply bit flip properties                               |  50847748718592 |    5d          
       4 |      13 | Apply bit flip properties                               |  50847748718592 |    5d          
       4 |      14 | Apply bit flip properties                               |  44694402760704 |    4d          
       5 |      15 | Apply bit flip properties                               |  44694402760704 |    4d          
       5 |      16 | Apply bit flip properties                               |  44694402760704 |    4d          
       5 |      17 | Apply bit flip properties                               |  44419201892352 |    4d          
       5 |      18 | Apply bit flip properties                               |  35674354876416 |    3d          
       5 |      19 | Apply bit flip properties                               |  29673314582528 |    3d          
       5 |      20 | Apply bit flip properties                               |  21800077492224 |    2d          
       5 |      21 | Apply bit flip properties                               |   5771871911936 |   13h          
       5 |      22 | Apply bit flip properties                               |   5771871911936 |   13h          
       5 |      23 | Apply bit flip properties                               |   3934981193728 |    9h          
       5 |      24 | Apply bit flip properties                               |   3934981193728 |    9h          
       5 |      25 | Apply bit flip properties                               |   3934981193728 |    9h          
       6 |      26 | Apply bit flip properties                               |   3934981193728 |    9h          
..............................    
     171 |    1640 | Apply bit flip properties                               |     37733543936 |  5min          
     171 |    1640 | Apply bit flip properties                               |     37733543936 |  5min          
     171 |    1641 | Apply bit flip properties                               |     37733543936 |  5min          
     172 |    1642 | Apply bit flip properties                               |     37733543936 |  5min          
     172 |    1643 | Apply bit flip properties                               |     37733543936 |  5min          
     173 |    1644 | Apply Sum property. Sum(a0) = 128                       |      5758310400 |   48s          
     173 |    1645 | Apply bit flip properties                               |      5758310400 |   48s          
     174 |    1646 | Apply bit flip properties                               |      5758310400 |   48s          
     174 |    1647 | Apply bit flip properties                               |      5758310400 |   48s          
     174 |    1647 | (1. guess: Sum(a8) = 256)                               |      5758310400 |   48s          
     175 |    1647 | Apply Sum(a8) and all bytes bitflip properties          |      5758282240 |   48s          
     176 |    1647 | Brute force phase completed. Key found: xxxxxxxxxxxx    |               0 |    0s          
test

After cleaning the code, I think it would be better idea to integrate the functionality directly into https://github.com/nfc-tools/mfoc

@devedse
Copy link
Author

devedse commented Nov 22, 2018

That's very cool!!! Would love to see this integrated within Mfoc :)

@vk496
Copy link

vk496 commented Dec 1, 2018

Hello again!

I have successfully integrated hardnested attack into mfoc.

https://github.com/vk496/mfoc/tree/hardnested

Is not ready yet to be merged into the official project, but is already working :)

Salu2

@devedse
Copy link
Author

devedse commented Dec 4, 2018

How would you call it?

@vk496
Copy link

vk496 commented Feb 28, 2019

How would you call it?

I'm more interested in integrate the mod into official project instead of forking a new one. Missing only some makefile code to support arm builds and the mod should be merged nfc-tools/mfoc#60

@ghost
Copy link

ghost commented Apr 30, 2019

Hello How to recovered the 2 missing files crapto1 and craptev1 because bra does not answer is what someone can send them to me?
[email protected]

@aczid
Copy link
Owner

aczid commented May 1, 2019

@vk496 has created an updated version of mfoc which applies the hardnested attack, please start using this tool. https://github.com/vk496/mfoc/tree/hardnested
I've tested the tool and it works fine (but could still be faster). Thank you @vk496!

@devedse
Copy link
Author

devedse commented May 1, 2019

Has it already been merged to MFOC master?

@aczid
Copy link
Owner

aczid commented May 1, 2019 •
edited
Loading

No, but the PR has been submitted there since last year.
nfc-tools/mfoc#60

@MichaelNec
Copy link

MichaelNec commented Oct 23, 2020 •
edited
Loading

@aczid I encountered the same problem as him, I would like to ask you how to use your py to convert txt to bin, and do not connect devices in PM3

@MichaelNec
Copy link

@vk496 I compiled it https://github.com/vk496/cropto1_ BS, but prompted no NFC device connection, want to ask how to use offline

@vk496
Copy link

vk496 commented Oct 23, 2020 via email

@MichaelNec
Copy link

@vk496 For example, I want to run a file password named 1234.bin, how should I operate, thank you again

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
4 participants
@aczid @devedse @vk496 @MichaelNec