AES encryption generating a different file each time

Dec 29, 2014 at 11:10 AM

I am not an expert in zip compression or AES encryption but I have noticed that when I compress the same file a couple of times with AES encryption using the same exact key, The archive content are always different. Comparing both archive files at binary level reveals two completely different files. Why is that? And is there a way to make the archive identical each time the same file gets compressed with AES using the same key?