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I have to determine encryption method of ZIP files I'm receiving.
Mostly I'm interested to know if AES was used or not...

Any idea ?

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Found that 7ZIP can display that.... – Maciej May 30 '11 at 14:49
up vote 3 down vote accepted

It tells you where that data is located in the spec: find on this page "AlgID 2 bytes Encryption algorithm identifier" and read the surrounding text.

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