Is there a way to determine the date of encryption or the GPG version of a GPG-encrypted file (with symmetric encryption)?
I lost the password but some rough information about when the file was encrypted would help me. (The oldest could be 5-7 years ago, newest a few months. The file modification time is also lost.)
For example, if I remember right, it could be that old versions of GPG did not have integrity checking. Can I figure this out?