[sudo-discuss] robot hacking - help crack the code!

[Jake]

On Tue, 23 Sep 2014, Patrik D'haeseleer wrote:

> On Tue, Sep 23, 2014 at 11:43 AM, Jake <jake at spaz.org> wrote:
>
>       disk: \x02\x13\x00LST0001123.JBI     \x00\xfc
>       disk: \x02\x13\x00LST0001124.JBI     \xff\xfb
>
>       yasnac: \x02\x0f\x00FRD123.JBI     \xdc\xfc
>       yasnac: \x02\x0f\x00FRD124.JBI     \xdb\xfc
> 
>  
>       perhaps it's a 16-bit checksum?
> 
> 
> Yeah, looks like some sort of 16-bit checksum, with the first hex code being the lowest byte. If you read them this way, you see they're exactly 1 bit
> different:
> 
> \x00\xfc -> #FC00
> \xff\xfb -> #FBFF
> 
> \xdc\xfc -> #FCDC
> \xdb\xfc -> #FCDB
> 
> I'd say try again with 113 or 133 in the filename, instead of 123 - need a bit more evidence.

write a test in python to see if you're right!  i will gather more 
evidence tonight though.

-jake