This is first 19 lines from the famous "Decree of Canopus", as found on the stella at San Al-Hajar ("Tanis Zoan" site), in 1866, by Prof. Lepsius, Reinisch, Roesler & Weidenbach. Detailed translation of the Egyptian hieroglyphic writing was possible, because the stella also had a Greek inscription. There is explicit meaning here - even if you might not be able to translate it initially. You can determine just by looking at it, that it is a written language.
The trick with Neural Networks and their use in Artificial Intelligence applications is to extract meaning from what may a first glance, look an awful lot like random noise or a low-information-content image. The critical data item may that is of the most importance, is often obfuscated or disguised. It's importance is only evident later, as the system evolves thru time. But seeing it early, and/or clearly so that the meaning can be extracted, can make the difference between success and failure - even between life and death.
If there is something there, with enough careful assessment, we can usually decode it. But if the data really is almost all random noise, then the decrypt exercise will be not just be difficult - it will probably fail. But that information is also of real value.