You can't even receive the P(Y) code without the encryption key.
Why would you care about content when you can always simply retransmit the signal. Few microseconds delay in receiving signal by GPS receiver is sufficient to spoof it.
- the first antenna receives GPS satellite signal
- and second is retransmitting the same signal with higher effect in the direction of GPS receiver you want to spoof.
The only thing is required to spoof positioning of GPS receiver is to put a few microseconds delay in retransmitted signal. Having higher output effect from spoofing antenna can make original satellite signal to be completely invisible for spoofed GPS receiver (satellite signal is rather weak, so it would not be any problem in achieving this). The position is calculated by time difference between timestamped signals received from different satellites visible to GPS receiver. So, the satellite and receiver can encrypt and sign the signal whatever they want. But for as long as adversary is able to receive satellite signal and retransmit exact same signal with few microseconds delay, with higher effect - spoofing of GPS receiver is a done deal.
"Let’s say Firefox recognises within the browser client, without any browsing history leaving my computer, that I’m interested in gadgets, comedy films, hockey and cooking," says Justin Scott, a product manager from Mozilla Labs. "Those websites could then prioritise articles on the latest gadgets and make hockey scores more visible. And, as a user, I would have complete control over which of my interests are shared, and with which websites."
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Yes, the "method" of science is similar in the disciplines of astrology and climate science
Should the scientists who discovered the diamond planet (or star) feel them-self offended by someone referring them as "astrologist"?