Are superluminal "signals" an acceptable hypothesis? - Difficulties in building a communication protocol with them

The local hidden variable assumption was repeatedly proved unable to explain results of experiments in which the contextuality principle is involved. In consequence, correlations between results of measurements of space-separated particles, tend to be attributed to communication through some kind of "signals" with unusual properties: superluminal velocity or backward in time movement. No objects are known to us that possess such properties. But the situation is even worse. If there exists a communication through such "signals", there also has to exist a communication protocol. The present article points to difficulties in building such a protocol, making the "signals" hypothesis hughly implausible