There so much that ettercap can do and there are many tutorials covering how to use it! Metasploit is an interesting pentest framework.
Once you have compromised the computer using metasploit you can extract the hashes doing :. Here, AnAdministrativeUser's account will be used to perform the password dump. The six DES keys are then used to encrypt the challenge. If it is set to 2, only the NTLM response is sent. If it is set to 3 or higher, a new version of both protocols is used. Both protocols use the NT hash to compute the response, and both use a client-side challenge, either instead of or in addition to the server challenge.
Passwords provide the first line of defense against unauthorized access to your organization. Beginning with Windows Server , Windows checks the complexity of the password for the Administrator account during setup of the operating system.
If the password is blank or does not meet complexity requirements, the Windows Setup dialog box prompts you to create a strong password for the Administrator account.
If you leave this password blank, you will not be able to access this account over the network. Weak passwords provide attackers with easy access to your computers and network, while strong passwords are considerably more difficult to crack.
The following table compares weak and strong passwords. A password can meet most of the criteria of a strong password but still be rather weak. For example, Hello2U! It is important to educate users about the benefits of using strong passwords and to teach them how to create passwords that are actually strong.
You can create passwords that contain characters from the extended ANSI character set. Using extended ANSI characters increases the number of characters that you can choose when you create a password.
As a result, it might take more time for password-cracking software to crack passwords that contain these extended ANSI characters than it does to crack other passwords. Before using extended ANSI characters in your password, test them thoroughly to make sure that passwords containing extended ANSI characters are compatible with the applications that your organization uses. Be especially cautious about using extended ANSI characters in passwords if your organization uses several different operating systems.
For example, these systems may standardize in ISO A passphrase is a different form of token-based password in which the tokens are words instead of symbols from a character set. An example of a passphrase is a sentence that contains special characters, numerals, uppercase letters, and lowercase letters.
The key differences between passphrases and passwords are:. Passphrases that conform to the character limit as set in the policy are generally, more difficult to crack than passwords because they contain more characters.
Even if there is some degradation in the memory contents, various algorithms can intelligently recover the keys. This method, known as a cold boot attack which would apply in particular to a notebook computer obtained while in power-on, suspended, or screen-locked mode , has been successfully used to attack a file system protected by TrueCrypt" — Ramhound.
I wouldn't say that Bitlocker is "worthless" otherwise why would Microsoft even implement it? If Bitlocker is susceptible to cold boot attacks then TrueCrypt is also. The built in encryption that exists in iOS, Mac OS, and Microsoft Windows performs the exact same function as TrueCrypt and is susceptible to similar attacks all except iOS because of the hardware it uses. I think a few of these comments have also made it seem like a complete script kiddie attack to use cold boot; researchers in a lab are one thing, but if you blow it in the real world, you might only have one chance, its not a guarantee.
Again you need to be targeted by someone who can get physical access and is technical. With those resources, they will probably just attack you, the human, at a lower cost per attack attempt.
Eric G as regards physical coercion, TrueCrypt implements a decoy OS feature meaning that in the event of extortion one can provide access to seemingly sensitive but relatively worthless information. This answer should only list the first two. Show 1 more comment. The older LM hash includes several capital weaknesses: Not case-sensitive. Limited to 14 characters. Splits the password in two 7-character halves which are hashed separately. There are various possible optimizations, but, as a rule, things would go like this: There is a security parameter, called t ; that's the average length of a chain in the rainbow table.
Building the table entails a cost of about 1. Attacking one password with the table entails computing about t 2 times the hash function, and making t lookups in the table.
Community Bot 1. Thomas Pornin Thomas Pornin k 57 57 gold badges silver badges bronze badges. In general, on most systems a longer password is always better. Eric G Eric G 9, 4 4 gold badges 30 30 silver badges 58 58 bronze badges. You should also set the registry to disable LM isn't that disabled be default in vista and higher? Cold boot is not that difficult, you extract the key with no issues directly from RAM.
For the passers-by, more on the cold boot: static. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. It is described in the script how to get this data. The script therefor does not have to be run as Admin and will work on any OS given the used Python libs are installed.
Since al required data to decrypt the hashes is either static, known or just some elaborate calculation. Microsoft has improved and simplified the encryption cycle by removing not only RC4 from the equation but also MD5 together with all unnecessary and old static strings. And if Microsoft really wanted to improve the security of their users, it should improve on the used hashing algorithm rather than just changing the used encryption ciphers ….
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