[Hackrf-dev] Replay attacks?

[Scott Jordan]

I tried a similar thing with hackrf_transfer, but with fm radio. I used another rtl2832u dongle to see what was happening, and it did transmit something, just not waveform I recorded
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On Tue, Jul 2, 2013 at 10:02 AM, Michael Ossmann <mike at ossmann.com> wrote:


> On Tue, Jul 02, 2013 at 09:31:48AM +0100, Adam Laurie wrote:

>>

>> On 02/07/13 02:34, Scott Jordan wrote:

>> > Has anyone found a good way to capture a signal from something then

>> > replay it later?

>> 

>> hackrf_transfer?

> Theoretically hackrf_transfer would be fine, but I ran into a problem

> while playing with a toy recently:

> http://ossmann.blogspot.com/2013/06/hackrf-lego-car.html

> I captured a waveform with hackrf_transfer, replayed it with

> hackrf_transfer, and the car did not respond.  Then I replayed the same

> captured waveform with a small flowgraph in gnuradio-companion, and the

> car moved.  I haven't gone back to figure out why it didn't work when

> using hackrf_transfer for TX.

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