Anything that can be encrypted can be un-encrypted................
Yes, if you have acres of supercomputers and months/years/millennia plus reason to devote them to decrypting one well-encrypted message.
Well, there's always "rubber hose cryptanalysis" too I suppose.
Only if you have the key. Otherwise you have to try brute force, trying every possible key until you get comprehensible results. Apple uses 256bit AES encryption with a key constructed from the passcode the user inputs entangled with a 128 character internal UUID hidden in the Secure Enclave of the device.
If someone really wants to keep anyone out, a sixteen complex passcode which can use all 223 characters available from the keyboard, would result in a 144 character key to encrypt the data. That would require 5.62 undecillion years to try every single possible key using a super computer capable of trying three trillion possible keys a year (150,000 keys per second generated and compared).
5.62 undecillion years equals 5.62 X 10195 years.
Certainly, but without the keys, it’s a pain in the *** to do (for modern encryption standards).
Our resident Apple expert will disagree.