No. For now the algorithms that search for extraterrestrial signals aren't trying to decode signals at all. They are only trying to detect extraterrestrial sign

No. For now the algorithms that search for extraterrestrial signals aren't trying to decode signals at all. They are only trying to detect extraterrestrial signals. The typical resolution for the Green Bank data is something like, every 20 seconds at a particular frequency gets summarized as one floating point number. That's enough to detect a sufficiently powerful signal over a few minutes of recording, but it isn't enough to decode any message. If we ever do detect a signal, it will probably require constructing a radio telescope that is even more powerful in order to decode that signal. At that point it would make sense to think about safety measures.