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Posted 15 May 2009

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Brute Force

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3.94/5 (9 votes)
15 May 2009CPOL
Brute Force algorithm with MD5 & SHA Hashing
Image 1


This is my attempt to create a brute force algorithm that can use any hash or encryption standard.


Bruteforcing has been around for some time now, but it is mostly found in a pre-built application that performs only one function. My attempt to bruteforcing started when I forgot a password to an archived rar file. I decided to create a bruteforce algorithm that can be used in a plug-and-play manner. At the moment, the basic hashing algorithms (MD5 & SHA) are supported but nothing stops you from using it to brute a Microsoft SQL password (* using pwdencrypt and pwdcompare).

Using the Code

Using the method is straight forward. Set up your character and password array and call the brute() or bruteUI() method.

//Password array
string[] passwordArray;
//Lowercare character array
string[] lower = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", 
	"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
//Uppercase character array
string[] upper = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", 
	"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
//Digits array
string[] digits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" }; 

private void setupCharArray()
   if (ckhLower.Checked)

   if (chkUpper.Checked)

   if (chkDigits.Checked)

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

Points of Interest

An MD5 and SHA Hash class make it easy to choose a hash type. While your PC is bruting away, a CPU monitor shows you the load on the system.


  • 15th May, 2009: Initial post

This is my first attempt to Bruteforcing and like I said it is expandable to many other hash types and encryption standards.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Pieter Alec Myburgh
Software Developer (Senior) EOH Microsoft Coastal
South Africa South Africa
Senior Software Engineer & Team Lead.

I reject your code and substitute my own!

Comments and Discussions

QuestionHow to Use Pin
Member 1351642413-Nov-17 14:06
MemberMember 1351642413-Nov-17 14:06 
GeneralThoughts Pin
PIEBALDconsult7-Mar-14 3:15
professionalPIEBALDconsult7-Mar-14 3:15 
QuestionOKok it works, but.. Pin
Member 106481687-Mar-14 3:12
MemberMember 106481687-Mar-14 3:12 
Questionnot working Pin
Psycho_Coder1-Apr-13 19:25
professionalPsycho_Coder1-Apr-13 19:25 
QuestionTried for MD5, didn't work properly Pin
Shukhrat Nekbaev20-Dec-12 3:10
MemberShukhrat Nekbaev20-Dec-12 3:10 
AnswerRe: Tried for MD5, didn't work properly Pin
Pieter Alec Myburgh16-Jan-13 23:47
MemberPieter Alec Myburgh16-Jan-13 23:47 
Questionstart true to arrive the the truth Pin
ibrahim_ragab5-Nov-12 8:43
professionalibrahim_ragab5-Nov-12 8:43 
QuestionIt works but you cant use it for like hotmail or something? Pin
swerdiofire13-Nov-11 2:34
Memberswerdiofire13-Nov-11 2:34 
GeneralMy vote of 4 Pin
c4th0d38-Oct-11 4:23
Memberc4th0d38-Oct-11 4:23 
GeneralRe: My vote of 4 Pin
CodeKrash28-Aug-12 17:19
MemberCodeKrash28-Aug-12 17:19 
GeneralMy vote of 4 Pin
Uhlume28-Sep-11 11:19
MemberUhlume28-Sep-11 11:19 
QuestionWrong Average PW/sec Calculation Pin
Member 81486429-Aug-11 10:14
MemberMember 81486429-Aug-11 10:14 
GeneralSymmetries Pin
Chris Maunder15-May-09 15:51
cofounderChris Maunder15-May-09 15:51 
GeneralRe: Symmetries Pin
Pieter Alec Myburgh3-Dec-09 23:25
MemberPieter Alec Myburgh3-Dec-09 23:25 
Hi. No I havent tried anything extra with this yet.
I just wanted to prove to myself I can figure out a basic bruteforce algorithm.

I'm sure you can code a bunch of mutators and rainbow table checks in there to make it much smarter.

I just dont see why anyone will want to buteforce MD5 and SHA when a website like exists. They really take the fun out of brute forcing.. I love it!
Jokewanted to say hi! Pin
eRRaTuM15-May-09 15:22
MembereRRaTuM15-May-09 15:22 
GeneralRe: wanted to say hi! Pin
Member 103700801-Apr-14 7:30
MemberMember 103700801-Apr-14 7:30 
GeneralHehe... Pin
Axel Rietschin15-May-09 12:50
professionalAxel Rietschin15-May-09 12:50 

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