Introduction and installation of crunch, and making password dictionary with crunch

One 、Crunch brief introduction

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Crunch It's one that runs in linux Dictionary generation tool in , You can customize your own password dictionary file flexibly .

  Can a password dictionary do it ？ Know everything. ！

Two 、Crunch install

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​kali系统 in 默认 install 有Crunch Tools .

Download address ：​ ​https://sourceforge.net/projects/crunch-wordlist/​​

1） Decompress the source package

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       [[email protected] ~]
       
       # tar zxvf crunch-3.6.tgz
       
       

       
       [[email protected] ~]
       
       # cd crunch-3.6/
       
       

       
       [[email protected] ~]
       
       # ls
       
       

       
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Get into crunch Under the installation directory of, you can see that there is a charset.lst file , In it, some nouns are defined to abbreviate the characters used to make dictionaries, such as ：

• numeric Express 0123456789
• lalpha Express 26 A lowercase letter
• ualpha Express 26 For capital letters

2） install ​

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       [[email protected] ~]
       
       # gcc -Wall -lm -pthread -std=c99 -m64 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 crunch.c -o crunch -lm
       
       

       
       [[email protected] ~]
       
       # make install
      
      
      
      

       
       
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3、 ... and 、Crunch Use syntax and parameters

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​ After installation , Start learning how to use Crunch The tool ​.

grammar

  crunch  min-len  max-len  [opention]​

Parameters

​min-len： The starting minimum length string （ This option is required ）

max-len： The maximum length string that ends （ This option is required ）

charset string To generate the character set contained in the password （ Lowercase characters 、 Uppercase characters 、 Numbers 、 Symbol ）, This option is optional , If you don't write this option , The default character set will be used （ The default is lowercase characters ）. If the password you want to generate contains space characters , You can use instead of , You can put the character set with spaces in double quotation marks “” in , Such as “123abc ”​

Options

• -o Output the generated password to the specified file ;
• -z Generated compressed dictionary file , The valid parameters are gzip, bzip2, lzma, and 7z, among gzip The fastest compression ,bzip2 Compression speed ratio gzip Slow single compression efficiency ratio gzip good ,7z The slowest compression , But the compression efficiency is the highest .
• -f Call the password library file , for example ：/usr/share/crunch/charset.lst;
• -t Define password output format （@ For inserting lowercase letters 、, For inserting capital letters 、% For inserting numbers 、^ Represents the caret ）
• -b： Divide the dictionary file into several dictionaries of specified size according to the specified size unit , Avoid a dictionary file that is too large ,

Example ： Press each file 20mib Split dictionary file

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       [[email protected] ~]
       
       # crunch 4 5 -b 20mib -o START
      
      
      
      

       
       
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explain ：

      The unit has kb, mb, gb, kib, mib, gib , The first three units are based on 1000 Calculated in units , The last three are 1024 Calculated .​

Note that there is no space between numbers and units , for example ：500mb That's right. , 500 mb The format is wrong （ There's a space in the middle ）,-b The parameters must be the same as -o START Use a combination of

• -c  Specify the number of lines to write to the dictionary file , Only in -o START Parameter , If a single dictionary exceeds the specified number of lines, it will be divided into two or more dictionary files . for example ： -c 5000
• -d  Limit the number of consecutive occurrences of the same character , -d 2 It means that one character is limited to appear continuously at most 2 It's like aabd,ccda.aaab It means more than 2 Consecutive characters limit .
• -e    Define that string and stop generating passwords , for example ： -e 999999 It means that the password is generated to 99999 Stop generating passwords when ​
• ​-i Change the output format , for example ： The original input is aaa,aab,aac,aad Use it again -i after , Will become aaa,baa,caa,daa The format of
• -p Define password elements
• -q Read password elements
• -r The definition starts over somewhere
• -s The first password , From the password defined by yourself xxx Start
• -u： Ban printpercentage Threads . This should be the last choice

Four 、 Use cases

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1. ​ Generate a 8 Bits contain upper and lower case letters 、 Numbers 、 A dictionary of common characters , And export to a file

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       [[email protected] ~]
       
       # crunch 8 8 -f /root/crunch-3.6/charset.lst mixalpha-numeric-all-space -o mima-8wei.txt
       
       

       
        transport 
       
        Out 
       
        junction 
       
        fruit 
       
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Data volume 54303TB, The file is too large .

​2、 Generate 10 Bit code , The format is “ Three lowercase letters + A symbol + Four Numbers + Two symbols ”, Limit the maximum number of consecutive occurrences of each lowercase letter 2 Time , Numbers appear continuously at most 3 Time

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       [[email protected] ~]
       
       # crunch 10 10 -t @@@^%%%%^^ -d [email protected] -d 3% -b 20mb -o START
      
      
      
      

       
       
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3、 Generate 8 Bit code , Each lowercase letter can appear up to two consecutive

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       [[email protected] ~]
       
       # crunch 8 8 -d [email protected]​
      
      
      
      

       
       
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