Password Cracker C++

[Vennie Fireman]

Ihad never used an online tool for password cracking before. I knew they were out there, but, there are literally hundreds of billions of passwords with their associating hashes, no database can store them all, this is seemed to be an impossible task, but I set out finding some resources to be able to work through the category.

Crackstation has been my favorite online tool since I discovered it in 2018. It contains numerous wordlists, including the most common rockyou, and 219 additional gigabytes of passwords. The dictionary is enormous! Crackstation is usually where I begin, as it will tell you the wordlist it pulled from, and that allows me to work further down that same list using another tool or website.

Md5decrypt is a website that is great for various password hashes as well as various encryption types. I have used this website for Md5, NTLM (lovely old Windows passwords), and a few of their encryption tools for both the NCL games and a few other CTFs. While they do not provide the name of the wordlist, I normally use that as a starting point to begin to research where that password is found.

onlinehashcrack.com was a bit of an unexpected gem. I have found many paid password tools, which I usually immediately write off and continue down the list, but, I noticed they had a free option, where, if the password was already in the database (which meant it was found in a more common wordlist) it was free! I immediately tried a few well known password hashes, such as d41d8cd98f00b204e9800998ecf8427e, which should always return for any tool, as that is the MD5 hash of a null string. Onlinehashcrack contains many additional tools as well, including some for basic zip file and encrypted word document cracking. This website does contain paid options as well, and they are fairly pricey, so I normally use this as a last resort.

So I locked myself out of a windows server 2003 tower and I do not even remember the local admin password. Does anyone have any recommendations on a good bootable password cracker that is free in order to retrieve my administrative password?

The thing here is, everything works and it generates 2 string password petty well. However, if length exceeds 2 or 3 strings. Well, it kind of moves at snail pace. Then I got an idea, if I could save the randomly generated password in the "b" list that I made and make sure that the passwords in that list are not repeated in the process then i think it will run significantly faster.

Password cracking is not an easy job. Think about the search space you have to go through as the length of the password grows. Your list of the possible characters contains 26 letters and 10 digits (by the way you can use string.digits and string.ascii_lowercase). So, for the first character in your password there are 36 options. The second has 36 options, the 3rd has 36 options and so on. Therefor, for a password of length n you will have 3^n options. As you can quickly see, this number is growing extremely rapidly even for small numbers.

I wouldn't expect the OS to just let you keep trying different numbers until you hit one that works. There are other well known ways to recover from a lost password, using the OS installer or a bootable Linux image. Wouldn't they be quicker and easier?

With an external keyboard connected via USB, I can type and enter all the passwords I want, not locked out.

OS installer will not remove this type of password nor will bootable linux image.

Thanks.

JB

The code you posted looks as if it would do the sort of thing you're trying to do although I don't quite follow what you're doing with fakecounter. What's the problem with that code? Does it compile? Does it do anything? What's it doing, or not doing, wrong?

When connect the Arduino, it does act as a keyboard-after a few seconds Tx LED flashes 6 times and the first 4 numbers appear in the text box (0000). After a slight delay TX flashes 6 more times and the next 4 numbers appear (0001). Repeats as it should.

None of the numbers are followed by a .

Where did you get it from? Where have you installed it? If it is installed correctly then it should appear in the list of libraries in the sketch / import library menu, and file / examples menu will include this library, and the standard examples under there will compile and run OK.

If you're trying to bruteforce the EFI password, good luck, those tend to be quite long, contain numbers, uppercase, lower case, and special characters (especially on Macbooks that have been "liberated" from educational institutions). The standard is about 30 characters. There are utilities to reset the EFI password. If you're trying to log into the Mac itself, there are boot disks that let you brute-force or reset the password.

Trying to brute-force a password in place is just dumb. Your little microprocessor is still going to be running numbers after the sun consumes the earth, its barely possible on a high-end x86 machine. Its much better to grab the encrypted passwords off the device and brute-force them on a machine you own (or using a cloud computing service).

Just did a little more research. Apparently the utilities that we use to reset EFI passwords aren't available to the public. Thats moronic, even by Apple standards. So...pray you have one with a PIN and not a 30 character alphanumeric password, I guess.

Ok, so I don't know much about programming but I know a significant amount about Macs (Apple Certified Tech). This brute force crack is for 2012 And newer MacBook Pros only. The previous ones were relatively simple to unlock.

The locking " feature is done via a Pin #. It is 4 digits. There apparently is also a 6 digit version for iCloud . Cracking the pin is basically as simple as entering a four digit pin (0000-9999) followed by a until the correct number is landed on. It is made more complicated in that the keyboard input need to "wait" long enough to emulate human input. The input slows significantly after the first 5 tries.

Before you assume this is some sort of criminal enterprise, my motivation is to correct a hole in The way Apple handles registration. Currently, when you buy a new Mac you are required to register it with an Apple ID. Apparently the Apple ID (email address/password) stays with the computer indefinitely even if the Admin password is changed. I have has several customers that In trying to upgrade to Mavericks 10.9 were prompted to enter an Apple ID that was not their own although the HD had been wiped previously. These were legit computers, one even refurb'd from Apple.

My current motivation is a little more personal. One of my best friends mother passed suddenly. The survivors found her laptop but it is now locked since they don't have her password. Normally Apple would unlock it with proof of purchase presented in store. Since the owner is deceased, Apple now says it would only accept a court order signed by a judge to unlock it.

Funny thing, I set an administrator password (0005) on another Mac, and ran the code and it opened up when it got to 0005. Trouble is, I had to physically hit as each number was created. So, mostly what it needs is code to generate .

There are actually many ways of doing this. For simplicity, you should divide the majority of the work. In this case, it is rather obvious that most of the work is done in computing the hash. In cases where it is not obvious, you will want to profile your application and find out where the majority of the time is being spent. But also remember there is overhead incurred for many thread creations/joins, so it best to allocate a subset of work to each thread before beginning the work (perhaps check some protected shared variable if someone has found the solution).

Notice, however, depending on the the kind of hashes you will be attempting to crack (I am assuming you will be brute-forcing), there is no guarantee that your program will finish. Most (by that, I mean any practical/effective one) hashing algorithms operate under the notion of computational infeasibility. If you will be generating random strings to crack, notice that all a cracker needs to do is find a collision. For instance, consider a situation where 'cat' and 'dog' map to the same hash value and the real password is 'dog.' If your cracker finds 'cat' as a solution, this solution is just as viable. This is still a very hard problem, however, and also not guaranteed to finish.

The other alternative is a dictionary attack (since this is educational - this should be feasible). If you are doing a simple dictionary attack and the word is not in the dictionary, you will simply be out of luck. This is guaranteed to finish at the end of your dictionary, however. To implement this, it would be best to split your dictionary. If you have 4 threads and a dictionary of 1000 words, then each thread should get a different subset of the dictionary (each with 250 entries to work on). In practice, however, most protected passwords probably have some form of salt as well (just something to think about).

The fastest multi-threading design typically is one thread per core. Why thread swap? the amount of work to be done remains the same. Many threads can be useful in some situations to ease design issues, but if you want full performance, then the design issues have to be met such that one thread per core can be used.

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