[Bug 220654] [NEW] unzip will not open 256 AES zip files

Launchpad Bug Tracker 220654 at bugs.launchpad.net
Fri Dec 12 08:26:34 UTC 2014


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Binary package hint: file-roller

Winzip and many other zip programs can now produce zip files that are
protected by 256 AES encryption.  Unzip in ubuntu cannot handle these
zips. The files within the zips are shown fine but when you try and
extract the following error occurs:

skipping: Test.txt                unsupported compression method 99

I believe this is because "unzip" is used to extract the archive. This is the output from "unzip":
dbrewer at HCC122J:~/Desktop$ unzip Test.zip
Archive:  Test.zip
   skipping: Test.txt                unsupported compression method 99

If "7z" is used it works fine:
dbrewer at HCC122J:~/Desktop$ 7z x Test.zip

7-Zip 4.51 beta  Copyright (c) 1999-2007 Igor Pavlov  2007-07-25
p7zip Version 4.51 (locale=en_GB.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)

Processing archive: Test.zip

Extracting  Test.txt
Enter password (will not be echoed) :

Everything is Ok

I attach an example of this kind of file.  The password is "monkey" (no
quotes).

Note peazip also can handle this.

** Affects: unzip (Ubuntu)
     Importance: Low
         Status: New

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unzip will not open 256 AES zip files
https://bugs.launchpad.net/bugs/220654
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