Use p7zip to open encrypted zip files

If you try to open an encrypted ZIP file but get cryptic errors such as:

$ unzip secret.zip
Archive: secret.zip
   skipping: secret.pdf  need PK compat. v5.1 (can do v2.1)
   skipping: secret.txt  need PK compat. v5.1 (can do v2.1)
   skipping:secret.xml  need PK compat. v5.1 (can do v2.1)

Then install the p7zip tool. The standard unzip that ships with most Linux and Mac OSX systems, can't handle the encryption. p7zip (http://p7zip.sourceforge.net) is based on a newer version of the ZIP standard and handles encrypted zips:

 $ 7z x gooze-17194.zip 

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=utf8,Utf16=on,HugeFiles=on,8 CPUs)

Processing archive: secret.zip

Extracting secret.pdf
Enter password (will not be echoed) :

Extracting  secret.txt
Extracting  secret.xml

Everything is Ok

Files: 3
Size:       25557
Compressed: 24101