Security :: Forgot LUKS Password - Possible To Crack With Limited Charset?
May 22, 2011
I've encrypted my root partition with LUKS and cannot remember my password. My main question is this: is it possible to extract the hash (or key; not sure on the correct terminology here) from the LUKS header and run it through a cracker? The hash type is SHA1 and I can remember the characters I used for the password, just not in the correct order (lots of special characters). That being said, given such a small charset, it should be crackable within a reasonable time, correct? Especially if I used a GPU accelerated cracker. What I don't know how to do is go about getting the hash from the LUKS header. Is any of this possible, or am I SOL? Of course, I have physical access to the system so I can boot it into any utilities I may need to.
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May 31, 2011
I have a rar file that is password protected and that i forgot the password (no clue at all!). How can i extrar the files on the rar. I'm using ubuntu 10.04.
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Apr 4, 2010
I'm using ubuntu 9.10 and I'm trying to crack my own password with John the Ripper. I've been reading and working at this for a long time and I've not been able to crack my password. I've added a "test" account on my machine with the password "password": For my Unix Password:
Code:
mark@mark-laptop:~/John/john-1.7.3.4/run$ sudo ./unshadow /etc/passwd /etc/shadow > mypasswd
mark@mark-laptop:~/John/john-1.7.3.4/run$ sudo ./john mypasswd
No password hashes loaded
YES I have read the README and the FAQ and for this problem they give the following possible problems:
Q: Why doesn't John load my password file? It says "No password hashes
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May 8, 2009
I just installed Fedora 10 on my laptop 2 days ago. I dont seem to remember the password i userd for my username. Is there a way to reset or change the password? I cannot login to the system.
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Sep 21, 2009
what does one do when he forgets the root password ? i still have a terminal logged in as root how can i change the password in terminall
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Aug 26, 2010
I have a problem with my ubuntu account. I am running 4 virtual machines, based on jeos-8.04 and I am using a public key authentication to login to my account (via ssh). This is not the problem, I have the key and the passphrase. But when I am logged in, I can't sudo, because I forgot the password for the accout.
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Jan 21, 2010
I forgot my new password. I followed the guide on how to recover the password but in recovery mode my keyboard doesn't work, I have tried a usb and a ps2 keyboard. What is going on? Or is there another way to reset my password?
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Aug 12, 2010
I'm trying to crack a password on a pdf document. I have been using pdfcrack from the repositories but when I run the command pdfcrack -f filename I get the error: Encryption not detected (is the document password protected?)
I get the same error if I add the -o or -u option. Does anybody know how to do this? Strangely, I can get into the file just by opening it in foxit in Windows, but when I save it elsewhere it is still password protected, so I need the real password. (Can't print to pdf in foxit in Windows)
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Feb 14, 2010
I know how to mount it manually. I've seen a howto on how to mount it automatically by loging in with the user, you type your username and password and it mounts your encrypted partition. But that's not what I want. My idea is to call cryptsetup and mount on boot, AND ask me for passphrase like when its loading the system, then if I don't type the right password it shouldn't mount /home, even though i type the correct USER password later when the system is loaded(and then I'd have an empty /home since my home partition wasn't mounted due to wrong passphrase).
This is what I tried: I added the commands to rc.local and I don't even feel like it was executed, no passphrase was asked. As a test if commands there were being executed, I tried simple commands lile mkdir /test and it worked. So commands there are executed, yet, no passphrase was asked to me, I looked on dmesg for crypt and found nothing, I pressed alt+ctrl+F1 desiring to find a passprhase-ask and again, nothing.
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Mar 9, 2011
I'm using air-crack to crack into my network for fun. (It's WPA, NOT wep)
I've acquired a network handshake (I think, do I run
Code:
sudo airodump-ng --channel 11 --bssid 00:00:00:00:00:00 -w data mon0 and capture only four packets for WPA keys?)
After that, I need to run the command aircrack-ng -w wordlist capture_file (where wordlist is your dictionary file, and capture_file is a .cap file with a valid WPA handshake) My wordlist is in /home/steaksauce/Documents/Dictionaries/ and the particular file I want to use as a dictionary is lenth10.txt -- I downloaded a dictionary, and added my own passkey to it so I could have my fun
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Feb 15, 2010
My computer was working this morning and both hard drives were working fine, then all of a sudden for about two hours I was stuck with this "problem", then after fumbling and moving and stablizing things, then Windows works? See below for details. I've finally reinstalled both hard drives, but the one with the Linux partition doesn't work: it says nothing is discovered on the disk. I can't login at the LUKS login after grub starts, therefore I can't get into Linux, but Windows works?! I used to be able to go directly into Grub when the computer starts, I forgot how to do that but it doesn't matter. If you need details I'd be glad to provide them. I just wondered why Linux doesn't work, but Windows does. I have Linux & Windows on two different separate hard drives
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Jan 26, 2011
Is there a way to crack the windows Administrator password in Linux (using the SAM file) WITHOUT resetting it?
Ok so Ive already got Ubuntu 10.10 on a usb bootstick. Chntpw is installed as well. What I'm wondering is are there any programs to crack as in decrypt the SAM file and show the password but not erase it? Most Linux programs Ive come across don't do this. They just reset the password.
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Jul 2, 2010
i forgot root password and how to change the password
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Jul 22, 2010
I've been studying air crack so that i can learn ways to improve my home wireless network and using air crack on ubuntu isn't as easy as i thought it would be.
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Jan 1, 2010
I forgot my ubuntu password, trying to follow the instruction on the web but keep fails to recover my password.
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Feb 21, 2010
I am running the latest xubuntu and I lost my password or so I think I might be typing it wrong, is there way to recover it (easy please).
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Mar 11, 2010
I forgot my usrename and password to get in what can I do?
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Oct 25, 2010
I read a few pages on how to get my password or reset or whatever and the pages don't apply to Ubuntu 9. They seem to describe older versions of Ubuntu and as i haven't done this before i have no idea where to go with it. One site suggested i add a line into an edit page after getting into the recovery mode but i can't see how. I am using a livecd to post right now. I forgot the password because it took forever for me to get my replacement motherboard after frying the previous one.
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Dec 3, 2010
Does any know if there is a way to recover or reset my password. Its the only account on the desktop.
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Jun 16, 2010
How can I get root passwd when I forgot it?
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Aug 30, 2010
Im trying to get into my system for first time in 2 years, i've forgotten all of my login info.. is there a back door..BTW ive never gone behind the scenes with this o/s before
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Sep 17, 2009
Forgot root password on fedora 10. Reboot into runlevel one and changed passwd and it said all tolkens updated. Typed exit and it didn't reboot and at login screen I logged in as other "root" and it didn't work with new password. So I redid the runlevel 1 and password change and typed init 6. It didn't work after that also. How to change fedora 10 root password if the old password is forgot?
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Apr 13, 2010
My root has chosen its own password for me as the chosen by me doesn't work.
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May 21, 2010
Forgot my password, how to recover or change it?
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Dec 22, 2010
I have seen a hundred post to just boot into the Recovery console and reset the users password, but when I do it asks for a password before I can do anything. I know there are Windows Password hack utilities, are there any for Linux/Ubuntu? Any other options? Can I use a live cd to access the config file or something?
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Jan 10, 2011
I have a friend who just recently got an old computer from a college. The college had been shut down for maybe 6 months and decided to sell all their equipment computer ETC. In that amount of time the college had forgotten the administrator passwords for all the computers. Therefore the computer can not be updated or upgraded to the latest version of Ubuntu.Is there anyway possible to get the administrator password so that I may update upgrade and install new necessary components for the computer?
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Jan 28, 2011
I've gave my son (7yrs) my old Eee PC 4G and he changed by istake the user password and forgot the new password.How can I overwrite the password?The only password I have is the BIOS Supervisor password...What can I do?Easy fix is preferred because I've no clue re Linux.Even formating and reinstall would be an option. (all data are on SD)I could boot from USB or SD but don't know what program I need and were to get it from
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Feb 12, 2011
Its been since October since I accessed my Arch OS, due to a career and phical move. Since that time I forgot my username and password (including root).My question is, is there a way to get around it without starting from scratch? Oh yeah, mbackup live CD is 700 miles away! lol I can only guess what the answer is going to be.
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Sep 8, 2010
I am trying to use Ubuntu 10.04 update, but have forgotten the password. If I could get the GRUB prompt, I could use a method I picked up somewhere, but where is the GRUB prompt, which I understand is a bootloader? My installation is single installation on a single partition. I press ESC before the Splash Screen, but just get a square bracket and pressing ESC makes no difference, to the continued boot process, except perhaps make it a little slower. I can use the Desktop and the software I use works fine. There is also something about a 'ring' that requires a password, which I also don't know.
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Mar 2, 2010
We use a linux (centOS I believe) cluster for our research. My professor somehow forgot the new password he set for root, and now can't login as 'su'. What is the way (or best way) to reset the root password without damaging something. I don't know whether it's even setup for 'sudo'. What will the procedure with and without 'sudo'?
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