Christian Heimes added the comment:
>From the zlib FAQ:
38. How can I encrypt/decrypt zip files with zlib?
zlib doesn't support encryption. The original PKZIP encryption is very weak
and can be broken with freely available programs. To get strong encryption,
use GnuPG, http://www.gnupg.org/ , which already includes zlib compression.
For PKZIP compatible "encryption", look at http://www.info-zip.org/
I don't see the point of a weak and easily breakable encryption.
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