Let's say I have secret files which I will encrypt. The resulting container will be shared and might be intercepted. Not good, but that's okay - that's why I encrypted the data in the first place.
Scenario in question
However, now, I'll encrypt and share the same data again. With the same passphrase. The container will be different (because the key changed) but the data inside it is identical. And the attacker knows this. Does this open the encryption to any vulnerabilities from a cryptographical standpoint?
Pardon my lack of technical terms. I guess this would be a ciphertext-only attack? But modified in a way that each plaintext (my data, my files) prior to encryption is the same?
(It's a general question, the encrypted container might be from dm-crypt/LUKS or VeraCrypt or even an encrypted ZIP archive. But I think all of them are using 256-bit AES.)