Cracking an Ubuntu password with John the Ripper is very easy. All that is needed is a good wordlist and the John The Ripper utility.
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Install the John the Ripper password cracking utility.
RAR Password Cracker requires Windows. There are no special requirements for memory capacity, but the CPU and GPU performance should be as high as possible. Special hardware is not required. Well I have come across a nice solution for cracking zip/rar files. Its called rarcrack, If you forget your password for compressed archive (rar, 7z, zip), this program is the solution. This program uses brute force algorithm to find correct password. You can specify which characters will be used in password generations.
Dump the Linux user account information to a file from the shadow and passwd files.
Make sure we have a suitable wordlist that could possibly contain a matching password. I used the rockyou.txt file from Kali Linux. Then we are ready to crack the password hashes.
This only took several seconds and both password hashes were cracked. This is a very easy Linux task, once the user has stolen the password files, which requires sudo access. I did this on Ubuntu 17.04. Very easy to crack the passwords, but you need to get access to the shadow and passwd files which is the hard part.
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If you want to crack zip file passwords use fcrackzip.fcrackzip is a fast password cracker partly written in assembler. It is able to crack password protected zip files with brute force or dictionary based attacks, optionally testing with unzip its results.Install fcrackzip in Ubuntu
sudo aptitude install fcrackzip
This will complete the installation.
Fcrack Syntax
fcrackzip [-bDBchVvplum2] [--brute-force] [--dictionary] [--benchmark] [--charset characterset] [--help] [--validate] [--verbose] [--init-password string/path] [--length min-max] [--use-unzip] [--method name] [--modulo r/m] file.
fcrack Options
-h, --help
Prints the version number and (hopefully) some helpful insights.
-v, --verbose
Each -v makes the program more verbose.
-b, --brute-force
Select brute force mode. This tries all possible combinations of the letters you specify.
-D, --dictionary
Select dictionary mode. In this mode, fcrackzip will read passwords from a file, which must contain one password per line and should be alphabetically sorted (e.g. using (1)).
-c, --charset characterset-specification
Select the characters to use in brute-force cracking. Must be one of
a include all lowercase characters [a-z]
A include all uppercase characters [A-Z]
1 include the digits [0-9]
! include [!:$%&/()=?[]+*~#]
: the following characters upto the end of the spe-
cification string are included in the character set.
This way you can include any character except binary
null (at least under unix).
For example, a1:$% selects lowercase characters, digits and the dollar and percent signs.
-p, --init-password string
Set initial (starting) password for brute-force searching to string, or use the file with the name string to supply passwords for dictionary searching.
-l, --length min[-max]
Use an initial password of length min, and check all passwords upto passwords of length max (including). You can omit the max parameter.
-u, --use-unzip
Try to decompress the first file by calling unzip with the guessed password. This weeds out false positives when not enough files have been given.
-m, --method name
Use method number 'name' instead of the default cracking method. Free cad for mac os x 10.5.8 os x 10 5 8. The switch --help will print a list of available methods. Use --benchmark to see which method does perform best on your machine. The name can also be the number of the method to use.
-2, --modulo r/m
Calculate only r/m of the password. Not yet supported.
-B, --benchmark
Make a small benchmark, the output is nearly meaningless.
-V, --validate
Make some basic checks wether the cracker works.
Winrar Password Crack
fcrackzip Examples
fcrackzip -c a -p aaaaaa sample.zip
checks the encrypted files in sample.zip for all lowercase 6 character passwords (aaaaaa .. abaaba .. ghfgrg .. zzzzzz).
fcrackzip --method cpmask --charset A --init AAAA test.ppm
checks the obscured image test.ppm for all four character passwords. -TP fcrackzip -D -p passwords.txt sample.zip check for every password listed in the file passwords.txt.
Rar Password Recovery
Crack A Rar Password Ubuntu Windows 10
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