As we know zip files supports a simple password-based symmetric encryption system and some vendors use other algorithms. I used the
zipinfo command in Linux but it doesn't say what encryption algorithm is used. How can I find that out?
7Zip archiver (freeware) has an info button that among other useful things tell you the encryption type an archive is using.
As a general note, .Zips usually use something called "ZipCrypto Deflatte".