Salt Cryptography & Cracking Salted Hashes by fb1h2s

FB1H2S aka Rahul Sasi www.fb1h2s.com www.garage4hackers.com Garage 4 Hackers http://www.garage4hackers.com Cracking Salted Hashes Web Application Security: The Do and Don'ts of Cryptography.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com An Introduction Garage 4 Hackers http://www.garage4hackers.com

[object Object],[object Object],Garage 4 Hackers http://www.garage4hackers.com www.fb1h2s.com www.garage4hackkers.com

Application that doesn’t use cryptography hashes: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],onclick="javascript:document.frm.id.value='user'; document.frm.passwd.value='value'; this.form.passwd.value=(hex_md5('CC6AB28BA9FAD121184B09E00F1DD6E7'+this.form.passwd.value)); this.form.submit(); www.fb1h2s.com www.garage4hackkers.com

So now what if the data are Encrypted , IS it secured ?? www.fb1h2s.com www.garage4hackkers.com

Hash Functions: Cracking The Salted Hashes: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

So what is that you could do to figure out the Hashing Algorithm used?? ,[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

www.fb1h2s.com www.garage4hackkers.com

My hashes were 13 char long and no where in the cheat sheet, but I was able to figure it out using few programming tutorial websites. ,[object Object],www.fb1h2s.com www.garage4hackkers.com

A simple walk through of of the Php crypt function: ,[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com <?php $password = crypt('password'); ?> Hashes: laAsfestWEiq1 Here password hashes generated would be on basis of a random 2 digit salt. Or we could provide our on salt. <?php $password = crypt('password',’salt’); ?> Hashes: sih2hDu1acVcA And the password verification code would be as follows: if (crypt($user_password, $password) == $password) { echo "Correct Password"; } ?>

[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

Slated Hashes. ,[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com $password = "password"; //user input $salt = "salted"; $password = md5($salt.$password); //saved in db md5(saltedpassword) Hashes: 1423de37c0c1b63c3687f8f1651ce1bf Salt: salted

For verifying such algorithms we need to try the following things. ,[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

Cracking the salt: ,[object Object],[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com We know : Md5(‘password’)== “5f4dcc3b5aa765d61d8327deb882cf99” Now question is Md5(‘password’ + “????WHAT????”) === “1423de37c0c1b63c3687f8f1651ce1bf”

Salt/Hash algorithm with Random Salt: ,[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com $password = user_input(); //user i $salt = rand(5); "; $password = md5($salt.$password); //saved in db md5(saltedpassword) Hashes: 6f04f0d75f6870858bae14ac0b6d9f73:14357 (Hash:Salt) Salt: 14357

A Scenario for the Requirement for a new tool. ,[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

How it should work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

Finding an unknown Hash Algorithm: ,[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com <?php $password = sha1('password'); // de4he6la fe4oe6late4he6lade4he6lade4he6la $final_password= md5($password) Final Password Hashes: 1423de37c0c1b63c3687f8f1651ce1bf

Algorithm_Bruter ,[object Object],[object Object],[object Object],[object Object],www.fb1h2s.com www.garage4hackkers.com

Algorithm_Bruter.php www.fb1h2s.com www.garage4hackkers.com

Thank You ,[object Object],www.fb1h2s.com www.garage4hackkers.com

Salt Cryptography & Cracking Salted Hashes by fb1h2s

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