How To Crack Winrar Using Cmd For Dummies

How to crack filesMost password-protected files can be cracked in seconds or minutes. You can demonstrate this “wow factor” security vulnerability to users and management.

Here’s a hypothetical scenario that could occur in the real world:.Your CFO wants to send some confidential financial information in an Excel spreadsheet to a company board member.She protects the spreadsheet by assigning it a password during the file-save process in Excel.For good measure, she uses WinZip to compress the file and adds another password to make it really secure.The CFO sends the spreadsheet as an e-mail attachment, assuming that the e-mail will reach its destination. The financial advisor’s network has content filtering, which monitors incoming e-mails for keywords and file attachments.

Unfortunately, the financial advisory firm’s network administrator is looking in the content-filtering system to see what’s coming in.This rogue network administrator finds the e-mail with the confidential attachment, saves the attachment, and realizes that it’s password protected.The network administrator remembers a great password-cracking tool available from Elcomsoft called that can help him out so he proceeds to use it to crack the password.Cracking password-protected files is as simple as that! Now all that the rogue network administrator must do is forward the confidential spreadsheet to his buddies or to the company’s competitors.If you carefully select the right options in Advanced Archive Password Recovery, you can drastically shorten your testing time. For example, if you know that a password is not over five characters long or is lowercase letters only, you can cut the cracking time in half. You should perform these file-password-cracking tests on files that you capture with a content filtering or network analysis tool. This is a good way to determine whether your users are adhering to policy and using adequate passwords to protect sensitive information they’re sending. CountermeasuresThe best defense against weak file password protection is to require your users to use a stronger form of file protection, such as PGP, or the AES encryption that’s built in to WinZip, when necessary.Ideally, you don’t want to rely on users to make decisions about what they should use to secure sensitive information, but it’s better than nothing.

Stress that a file encryption mechanism, such as a password-protected Zip file, is secure only if users keep their passwords confidential and never transmit or store them in unsecure cleartext (such as in a separate e-mail).If you’re concerned about unsecure transmissions through e-mail, consider using a content-filtering system or a data leak–prevention system to block all outbound e-mail attachments that aren’t protected on your e-mail server.

Welcome back, my neophyte hackers!I have already done a few tutorials on password cracking, including ones for and, and, and even online passwords using. Now, I thought it might be worthwhile to begin in general. Password cracking is both an art and a science, and I hope to show you the many ways and subtleties involved.We will start with the basic principles of password cracking that are essential to ALL password cracking techniques, followed by some of the tools and technologies used.

Then, one by one, I will show you how to use those principles and technologies effectively to crack or capture the various types of passwords out there. The Importance & Methods of Password CrackingPasswords are the most widely used form of authentication throughout the world. A username and password are used on computer systems, bank accounts, ATMs, and more. The ability to crack passwords is an essential skill to both the hacker and the, the latter needing to hack passwords for accessing the suspect's system, hard drive, email account, etc.Although some passwords are very easy to crack, some are very difficult. In those cases, the hacker or forensic investigator can either employ greater computing resources (a botnet, supercomputer, GPU, ASIC, etc.), or they can look to obtain the password in other ways.These ways might include insecure storage. In addition, sometimes you don't need a password to access password-protected resources. For instance, if you can replay a cookie, session ID, a Kerberos ticket, an authenticated session, or other resource that authenticates the user after the password authentication process, you can access the password protected resource without ever knowing the password.Sometimes these attacks can be much easier than cracking a complex and long password.

I will do a tutorial on various replay attacks in the near future (look out specifically for my upcoming article on stealing the Facebook cookie to access someone's Facebook account).Now, let's start with the basics. Step 1: Password StorageIn general, passwords are not stored in clear text. As a rule, passwords are stored as hashes. Hashes are one-way encryption that are unique for a given input. These systems very often use MD5 or SHA1 to hash the passwords.In the Windows operating system, passwords on the local system are stored in the SAM file, while Linux stores them in the /etc/shadow file. These files are accessible only by someone with root/sysadmin privileges. In both cases, you can use a service or file that has root/sysadmin privileges to grab the password file (e.g.

DLL injection with samdump.dll in Windows). Step 2: Types of Attacks DictionaryA dictionary attack is the simplest and fastest password cracking attack. To put it simply, it just runs through a dictionary of words trying each one of them to see if they work. Although such an approach would seem impractical to do manually, computers can do this very fast and run through millions of words in a few hours. This should usually be your first approach to attacking any password, and in some cases, it can prove successful in mere minutes. Rainbow TableMost modern systems now store passwords in a hash.

This means that even if you can get to the area or file that stores the password, what you get is an encrypted password. One approach to cracking this encryption is to take dictionary file and hash each word and compare it to the hashed password. This is very time- and CPU-intensive. A faster approach is to take a table with all the words in the dictionary already hashed and compare the hash from the password file to your list of hashes. If there is a match, you now know the password. Brute ForceBrute force is the most time consuming approach to password cracking.

It should always be your last resort. Brute force password cracking attempts all possibilities of all the letters, number, special characters that might be combined for a password and attempts them. As you might expect, the more computing horsepower you have, the more successful you will be with this approach.

HybridA hybrid password attack is one that uses a combination of dictionary words with special characters, numbers, etc. Often these hybrid attacks use a combination of dictionary words with numbers appending and prepending them, and replacing letters with numbers and special characters. For instance, a dictionary attack would look for the word 'password', but a hybrid attack might look for 'p@$$w0rd123'. Step 3: Commonly Used PasswordsAs much as we think each of us is unique, we do show some common patterns of behavior within our species. One of those patterns is the words we choose for passwords. There are number of wordlists that have been compiled of common passwords.

In recent years, many systems have been cracked and passwords captured from millions of users. By using these already captured passwords, you are likely to find at least a few on the network you are trying to hack. Step 4: Password Cracking StrategyMany newbies, when they start cracking passwords, simply choose a tool and word list and then turn them loose. They are often disappointed with the results.

Expert password crackers have a strategy. They don't expect to be able to crack every password, but with a well-developed strategy, they can crack most passwords in a very short amount of time.The key to develop a successful strategy of password cracking is to use multiple iterations, going after the easiest passwords with the first iteration to the most difficult passwords using different techniques for each iteration. Step 5: Password Cracking Software Johnis probably the world's best known password cracking tool. It is strictly command line and strictly for Linux. Its lack of a GUI makes a bit more challenging to use, but it is also why it is such a fast password cracker.

One of the beauties of this tool is its built in default password cracking strategy. First, attempts a dictionary attack and if that fails, it then attempts to use combined dictionary words, then tries a hybrid attack of dictionary words with special characters and numbers and only if all those fail will it resort to a brute force. OphcrackOphcrack is a free rainbow table-based password cracking tool for Windows. It is among the most popular Windows password cracking tools (Cain and Abel is probably the most popular; see below), but can also be used on Linux and Mac systems. Cain and Abel can crack passwords using a dictionary attack, rainbow attack, and brute force. One of its better features is the ability to select the password length and character set when attempting a brute force attack. And besides being an excellent password cracking tool, it is also a great and tool.

THC-Hydrais probably the most widely used online hacking tool. It is capable of cracking web form authentication, and when used in conjunction with other tools such as Tamper Data, it can be a powerful and effective tool for cracking nearly every type of online password authentication mechanism. It is only available for Linux and requires a bit of a learning curve to master, but you will be richly rewarded for the time spent learning it. In addition, to be most effective you will need to use, so check their extensive list before buying your card. You can find more info on aircrack-ng over in.Aircrack-ng is built into and and can be downloaded. Step 6: Password Cracking Hardware BotnetPassword cracking is simply a function of brute force computing power.

What one machine can do in one hour, two machines can do in a half hour. This same principle applies to using a network machines.

Imagine what you can do if you could access a network of one million machines!Some of the botnets available around the globe are more than a million machines strong and are available for rent to crack passwords. If you have a password that might take one year to crack with your single CPU, a million-machine botnet can cut that time to approximately 1 millionth the time, or 30 seconds! GPUGPUs, or graphical processing units, are much more powerful and faster than CPU for rendering graphics on your computer and for cracking passwords. We have a few tools built into Kali that are specially designed for using GPUs to crack passwords, namely cudahashcat, oclhashcat, and pyrit. Look for coming tutorials on using these tools and the GPU on your high-end video card to accelerate your password cracking.

How To Crack Winrar Using Cmd For Dummies Mac

ASICIn recent years, some devices have been developed specifically for hardware cracking. These application-specific devices can crack passwords faster than over 100 CPUs working symmetrically. Master OTW,I just made an account on null-byte but i've been following your posts and tutorials for a while now. I must say they are excellent and i'm learning a lot! One thing i've been struggling with is to install the NVIDIA driver for my gt540m(oldie) so that i can use programs like pyrit and cudahashcat.