fcrackzip is a third-party tool for cracking zip files passwords. It tries to brute force using a list of passwords.
Installation
- sudo apt install fcrackzip
Before using fcrackzip we need a password protected zip file.
- zip –password <password><filename.zip> <data>
- zip –password vk9security new_file.zip data.txt
How to use
1. Show help
- fcrackzip -h
- -b: for using brute force algorithms.
- -D: for using a dictionary.
- -B: execute a small benchmark.
- -c: use characters from charset.
- -h: show the help message.
- –version: show the version of this program.
- -V: validate or check the algorithm.
- -v: for verbose mode.
- -p: for using a string as a password.
- -l: for providing a specific length to password.
- -u: for weed out wrong passwords.
- -m: to specify the method number.
2. Define charsets to brute force
- fcrackzip -b -c ‘Aa1’ new_file.zip
- fcrackzip -b -c ‘Aa1’ -u new_file.zip
3. Using numeric password, verbose, and length -l <min><max>
- fcrackzip -b -c ‘1’ -v-l 1-9 new_file.zip
4. Providing an initial password
- fcrackzip -b -v -c ‘a’ -p vk9security new_file.zip
5. always use -u to point out the match
- fcrackzip -b -v -c ‘a’ -p vk9security -u new_file.zip
6. Using a dictionary list file
- fcrackzip -D -p ./pass.txt -u new_file.zip
