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I received a zip with an encrypted file inside.

How do I determine which encryption method was used on it in WinZip 9.0? I've cruised all the menus and options and see no easy way to tell this information.

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Maybe from the file header in a hex viewer? – Randolph West Sep 12 '11 at 22:36
The format of a ZIP file is published by PKWARE, e.g. at http://www.pkware.com/documents/casestudies/APPNOTE.TXT and this document gives the location and content of the encryption header(s). – mas Sep 13 '11 at 14:11
It's sad that encryption method isn't shown in the GUI. I'll be happy with an answer that gives a program that DOES show the encryption method, without having to resort to a byte-by-byte analysis to discover it. Such a thing is not beyond my capabilities, but far, far beyond my desires. You may as well market a courier service that uses both clear & opaque envelopes, but takes letter contents out just before delivery. How is the recipient to know if his letter could have been viewed in transit? – ErikE Dec 13 '11 at 2:36
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