Old Egyptian developed and was never meant to be "decrypted" from scratch.
Some thing will have to be the same for the aliens. Some things like mathematics (Pi, Pythagoras, Primes). If you send a message that needs to be understood, send mathematical information.
Some thing will have to be the same for the aliens. Some things like mathematics (Pi, Pythagoras, Primes). If you send a message that needs to be understood, send mathematical information.