{"id":1239,"date":"2012-08-23T15:23:34","date_gmt":"2012-08-23T15:23:34","guid":{"rendered":"http:\/\/blog.designed79.co.uk\/?p=1239"},"modified":"2012-08-23T15:23:34","modified_gmt":"2012-08-23T15:23:34","slug":"how-to-find-a-lost-zip-file-password-with-fcrackzip","status":"publish","type":"post","link":"https:\/\/blog.designed79.co.uk\/?p=1239","title":{"rendered":"How to find a lost ZIP file password with fcrackzip"},"content":{"rendered":"

fcrackzip<\/strong>\u00a0is a free ZIP password cracking utility for\u00a0Linux<\/strong>\u00a0and\u00a0OS X<\/strong>\u00a0that can be used to recover lost ZIP file passwords through\u00a0brute force<\/a>\u00a0or\u00a0dictionary attacks<\/a>.<\/p>\n

To install fcrackzip on Linux, you can use use apt-get:<\/p>\n

\n\n
sudo apt-get install fcrackzip<\/div><\/div>\n\n<\/pre>\n
… yum:<\/p>\n
\n\n
sudo yum install fcrackzip<\/div><\/div>\n\n<\/pre>\n
… or a similar repository system.<\/p>\n
To install\u00a0fcrackzip<\/strong>\u00a0on\u00a0Mac OS X<\/strong>, first\u00a0install MacPorts<\/a>\u00a0then install\u00a0fcrackzip<\/strong>\u00a0throughMacPorts<\/strong>:<\/p>\n
\n\n
sudo port install fcrackzip<\/div><\/div>\n\n<\/pre>\n
The default\u00a0brute force<\/strong>\u00a0starting length is 5-6 characters, so you might want to specify a minimum and maximum password length when you invoke\u00a0fcrackzip<\/strong>. To use the utility, switch to the directory containing your encrypted ZIP file and run\u00a0fcrackzip<\/strong>\u00a0with the “-b<\/strong>” (use a brute force attack<\/em>), “-u<\/strong>” (use unzip to weed out wrong passwords<\/em>), and “-l<\/strong>” (specify password length<\/em>) arguments:<\/p>\n
\n\n
fcrackzip -b -u -l 1-4 geekology.zip<\/div><\/div>\n\n<\/pre>\n
The software will run for some time depending on the complexity of the ZIP file’s password and will display a success message once it finds the correct key (in my test the brute force attack took 1 minute to find the correct result for a 4-letter password<\/em>):<\/p>\n
\n\n
PASSWORD FOUND!!!!: pw == geek<\/div><\/div>\n\n<\/pre>\n
You can find more information on\u00a0fcrackzip<\/strong>‘s usage in its help page (“fcrackzip -h”<\/em>):<\/p>\n
fcrackzip version 1.0, a fast\/free zip password cracker
\nwritten by Marc Lehmann <pcg@goof.com> You can find more info on
\nhttp:\/\/www.goof.com\/pcg\/marc\/<\/p>\n
USAGE: fcrackzip
\n[-b|–brute-force] use brute force algorithm
\n[-D|–dictionary] use a dictionary
\n[-B|–benchmark] execute a small benchmark
\n[-c|–charset characterset] use characters from charset
\n[-h|–help] show this message
\n[–version] show the version of this program
\n[-V|–validate] sanity-check the algortihm
\n[-v|–verbose] be more verbose
\n[-p|–init-password string] use string as initial password\/file
\n[-l|–length min-max] check password with length min to max
\n[-u|–use-unzip] use unzip to weed out wrong passwords
\n[-m|–method num] use method number “num” (see below)
\n[-2|–modulo r\/m] only calculcate 1\/m of the password
\nfile… the zipfiles to crack<\/p>\n
methods compiled in (* = default):<\/p>\n
0: cpmask
\n1: zip1
\n*2: zip2, USE_MULT_TAB<\/p>\n","protected":false},"excerpt":{"rendered":"
fcrackzip\u00a0is a free ZIP password cracking utility for\u00a0Linux\u00a0and\u00a0OS X\u00a0that can be used to recover lost ZIP file passwords through\u00a0brute force\u00a0or\u00a0dictionary attacks. To […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1239","post","type-post","status-publish","format-standard","hentry","category-info-on-tech"],"_links":{"self":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1239"}],"version-history":[{"count":0,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1239\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}