What information can be obtained from encrypted file?
If the file has been encrypted with a binary key, then it contains the key ID, from which an adversary can know the time when the key (not the encrypted file) has been created. No specific information is present if a password or a raw key has been used. Please remember that Silver Key Description text is not encrypted. All other parcel data – including even the color of the custom background – is encrypted and cannot be acceessed without knowing the right password.