[knorker]

So if I understand this right the signature is 32bits times 24 times 15 per full frame?

After the fact, why exactly can I not precalculate my spoofed data stream?

I just need to spend:

  3*2^31*24*15*(spoof_seconds/30) ops (on average)?

(assuming 3 streams for position data)

Sure, not cheap, but hardly hard even for even a hobbyist.

So ~2^45 ops to spoof 10 minutes of data? That's doable.

Is my math off?

I have more faith in the direction finding aspects. Here's from the article, an understatement of the year:

> To beat these simple tricks, a spoofer will need to have multiple transmitters that actually show the same parallax as the actual satellites. However, you can only do this by placing your transmitters next to the satellites - in space. This raises the bar significantly.

[MauranKilom]

The HN formatting is eating your * signs...

[knorker]

Thanks. Fixed.