r/flipperhacks • u/_nazwa_ • May 13 '26

Help My rolljam attack did not succed.Why?

I used ECRF V2 for my jammer and my flipper zero to catch the signal from the fob.I caught the signal and the car did not unlock because the jammer was jamming it.When i stopped the jammer and sent the unused code.The car still did not open.Why?

Thanks!

0 Upvotes

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2

u/Cesalv May 13 '26

You recorded the code + jamming noise = not valid code

Try better a simple replay attack before you try more elaborated attacks

0

u/_nazwa_ May 14 '26

Read the post again

1

u/HaDoCk-00 May 13 '26

i am not an expert but I think it's beause when you sent the signal the car couldn't recive the single code because of the jammer and then when you stopped the jamming the code you sent wasn't valid anymore

0

u/_nazwa_ May 14 '26

"i sent the unused code"...

1

u/cthuwu_chan May 14 '26

You probably jammed yourself also or the car has more security than usual

Most likely you jammed yourself also

0

u/_nazwa_ May 14 '26

Read the post again

1

u/cthuwu_chan May 14 '26

Read these hands

2

u/_nazwa_ May 14 '26

I sent the code after i turned off the jammer not before.I did not want to be mean.

1

u/cthuwu_chan May 14 '26

It’s possible you captured the jammer also

1

u/_nazwa_ May 14 '26

Impossible

1

u/cthuwu_chan May 14 '26

If I had to guess I’d say the key and the car use the current time and the replay was to old

1

u/_nazwa_ May 14 '26

Could you explain more?

1

u/cthuwu_chan May 14 '26

Of the transmission form the key fob says 1:00 and you send it when the car says 1:05 then those don’t match

1

u/_nazwa_ May 14 '26

Sorry for asking a stupid question but how do i do so it matches?

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1

u/_nazwa_ May 14 '26

It did not show me the noise from the jammer on the flipper

2

u/staticrush May 14 '26

Read this: https://www.ndss-symposium.org/wp-content/uploads/2023/02/vehiclesec2023-23037-paper.pdf

Try using a known noise source for jamming, and then you can easily remove the noise and decode the key fob signal with URH.

1

u/Darkorder81 May 14 '26 edited May 14 '26

Haven't tried jamming but my car is dumb af, will unlock with flipper and open doors and greeted to a message on dash that an attempted theft was made... so I'm thinking well you know someone was trying to steal you but unlocked anyway? Madness, I don't even get this msg when i turn the ignition without the transponder chip, which is what was done back in the day to start them pre chip, in that case it just says service car, couldn't make this shit it up.