Greetings fellow hackers. This tutorial is about creating "safe" passwords. This is different from strong passwords. Safe passwords is just creating a password that is not used by someone else or colleague, my definition. But how do you prevent something like this from happening? Of course you won't ask your friend if s|he is using the password you are about to create. Before I show you some of my tele-psychic powers like Professor Xavier, you might want to read this for advice on creating "strong" passwords. Creating strong passwords is good, but just like OTW said, even his password-"I<3mtnb1k1ng&h1k1ng"(something like that), is not good enough against botnets and GPU's. But then again, it is a good, strong one. It would take a long while to crack that one, but I guess someone would really want to hack into your PC to try and brute force it. Unless of course you have FDE(Full Disk Encryption) on board and you are a suspect in "Hacking the Gibson."
First and foremost, Fire up your pentesting distro, kali/parrot/backbox...etc, I'll be using kali. Now create a password hash of any hashing algorithm, but I recommend MD5 as it is the weakest hashing algorithm thus takes a short time to crack - the iterations of passwords per second. Unlike some others like SHA1-512 which takes a pause after a wrong password is input, it will take a bit longer than MD5 to crack. You can use any tool for this. For a noob-friendly you can use CryptoFox, an add-on toolbar for Firefox which is an encryption/decryption tool and it can also encode/decode URL if you ever need it for SQLi. Just download it from here. It's easy to use, just select an algorithm from the drop down menu where it says 'select an option', then select MD5 encrypt. Now write your password and press ENTER. If that doesn't work, click Encode/Decode on the far right. I'll be using mkpasswd preinstalled in Unix.
Open your favourite terminal and type
kali > mkpasswd --help
It shows us the help screen for this program and the available algorithms. Now let's create the password by
kali > mkpasswd
As you can see it prompts for the password right away. But by default it uses DES(Unix), so we have to change it to use MD5. From the help screen it seems easy as we just type
kali > mkpasswd -5
Now enter your password, I'll choose monkey; it's easy to remember and no-one can think of it.
Copy the hash and save it as hash.txt . You may use any password cracker, I will be using JohnTheRipper. You can paste the hash by highlighting the hash copying it with Crtl+Shift+C and type these commands
kali > nano hash.txt
then ctrl&shift&V to paste. Ctrl&X to exit, then y.
Lets get cracking:
kali > john --wordlist=/usr/share/wordlists/*.* hash.txt
NOTE: with *.* it won't work as the it doesn't take wildcards. Thats just me showing you to use every wordlist in that directory.
If you are able to crack your password, then your password might not be safe because hackers use nearly the same tools = same wordlists. My 'monkey' password was cracked so I have to consider using another password, or do I. So now you understand why its necessary to check if your passwords exists on compromised ones.
Maybe you don't like this method, no problem, you can use something like grep, which is more useful than many would ever imagine. And grep comes pre-installed in linux, not sure if it's on Unix based systems. This is perfect as, if the password doesn't exist in any of the wordlists it won't be printed. But where's the fun in that. Anyway, here are the commands
kali > grep yourpassword /password/list.txt
Damn, seems like monkey is pretty famous.
Step 3: What's next
So you now found that your "new" password is in one of the lists. What do you do? Well, the best thing would be to start from step 1, but there's another thing way. Take monkey for example, now you can go back to the basics of creating "strong" passwords and monkey will become M0nk3Y and maybe add a number at the end or in front. This could be your favourite number or something else, and no! it can't be your date of birth.
Well, this is it. Advice perhaps: Take an example from Ollie in Mr. Robot. His password was 123456Seven. Even though the password in the wordlists was 123456seven lower case s, if he would have used my method, Elliot probably would have faced some challenges other than cracking the password in 4 seconds. To actually see the power of wordlists when cracking passwords, even though this isn't a Black Hat Community and what I'm about to share may seem nefarious, cracking one's password was easy(for practice purposes). Remember Tanmay, the guy who created link this wonderful and amazing notebook which is password protected to keep your findings about the "Gibson" safe. I was able to crack
his password in a snap, literally. Keep in mind that still your password won't be 100% uncrackable, but it will get a hacker tired.