Questions tagged [password-cracking]

for questions relating to the cracking of passwords and the practices to mitigate against passwords being cracked.

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1answer
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MySQL Authentication Hash Cracking

I'm currently conducting research regarding MySQL server remote authentication. I've captured unencrypted, uncompressed authentication packets between the client and the server where the username is ...
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2answers
497 views

Why providing many protected zip files will increase the chance of retrieving the password

In fcrackzip man they say : the more files you provide, the better. I want to know why. What's the method it uses to retrieve the password?
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0answers
84 views

Crack WPA2 with username [duplicate]

As far as I know you can crack WPA2-connections if you have the four-way-handshake. Then your program calculates the PMK/PTK and you get the key for the network. But what is with a WPA2-network where ...
2
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1answer
6k views

How do we estimate the time taken to crack a hash using brute force techniques

A German hacker famously managed to brute force crack a 160 bit SHA1 hash with passwords between 1 to 6 digits in 49 minutes. Now keeping everything constant (hardware, cracking technique - here brute-...
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2answers
150 views

Precise measurement of password complexity

I am thinking on a system, which measures the complexity of a password not based on its entropy or compressibility, but with a simply sophisticated method. The measurement of the entropy/...
1
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1answer
15k views

Cracking Mysql 5 Hash using Hashcat

I am practicing cracking MYSQL5 hash using hash cat, however, for a reason or another, it finishes the cracking process too fast -within 30 seconds- without giving any results/errors back. I doubted ...
3
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2answers
25k views

NTLM/LM Hashes on Domain Controller

I've noticed that when extracting password hashes from a domain controller (using Elcomsoft proactive password auditor) sometimes I'll get LM and NTLM hashes and other times I'll only get NTLM hashes. ...
1
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1answer
865 views

Cracking encrypted SQB databases

I've recovered a .SQB SQL database backup file from a backup server and do not have the password. As I do not have the password available to me, I'm looking to determine what type of encryption is ...
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1answer
3k views

What to do with .hash files when cracking WPA2

So, I'd say I'm one level above n00b. I've gotten to the point where I have accomplished a WPA Handshake (and saved the output as xxx-01.cap). I have also downloaded these hash tables (if that is the ...
5
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1answer
6k views

Chinese or “pinyin” wordlists for dictionary attacks

Background: I am currently trying to crack a salted md5 hash which I have recovered from an embedded device running busybox and manufactured in china. I have tried john the ripper using all of the ...
81
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11answers
50k views

Why is client-side hashing of a password so uncommon?

There are very few websites that hash the users password before submitting it to the server. Javascript doesn't even have support for SHA or other algorithms. But I can think of quite a few ...
0
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2answers
28k views

Hydra https-form-post [closed]

I have never experimented much with online password crackers. I attempted to use Hydra today on this website www.athena2.harker.org and I keep getting false positives. This is what I have done so far:...
2
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1answer
6k views

How to crack SHA512 hexdigest passwords with John the Ripper?

I've been playing with John The Ripper (JtR) to try to crack/audit a salted password that was hashed with SHA-512, with 20 interactions according to the source (for the curious, this is a Rails app, ...
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0answers
231 views

Can ophcrack crack credential files?

I have obtained some credential files from another pc and would like to decrypt them. These are the ones found under local/roaming profile in Appdata folder C:\Users\%USER%\Appdata\Microsoft\...
1
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1answer
133 views

Where to offer money for cracking check [duplicate]

I made a software and I would like to distribute it as a demo that can be registered. I would like to know if there is a site where I can offer some reward for some one try to crack my software and ...
11
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1answer
66k views

Forgot password to 7-Zip archive

I think I already know the answer to this question, but I thought I'd ask the experts anyway. A few months back, I created a password-protected 7-Zip archive which housed the source code of a simple ...
1
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1answer
833 views

Problems with l0phtcrack

I recently wrote a website for my company and have been asked to Pen test it as well as the server. Have run SQL map and no vulnerabilities there, however I want to check if my hash and things are ...
3
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2answers
2k views

Pattern based password cracking

I need to select a project for this semester. I'm a second year uni student in Ethical Hacking and Countermeasures. My idea was to see if using some kind of pattern based password cracking can be more ...
0
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1answer
1k views

WPA/PSK Dictionaries

So i have been reading some articles on WPA/PSK encryption, And one said that the hash is calculated like this: Key = PBKDF2(passphrase, ssid, 4096, 256) Where PBKDF2 is a standardized method to ...
2
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2answers
2k views

What is the ultimate goal of hacking a webserver? [closed]

Recently I noticed a lot of traffic generated by automated bots that were checking for vulnerabilities in my web server. They were mainly looking for ways to hack into plesk/wordpress which I don't ...
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3answers
3k views

Cracking passwords after a pattern with John

So I am trying to find out how easy it is to crack a password using some great Linux tools. We all know about John as a password cracker and how great it is. But how about specifying a pattern. Let'...
3
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3answers
5k views

Rainbow Tables: What is the Reduction Used for?

This is a follow up from this answer. The answer is very good, and it put me to thinking and doing some research. I have found another good explanation on this site. At some point, the author says: ...
3
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1answer
1k views

How do I convert from this weird John/Asleap format to lc (for HashCat)?

I'm trying to setup a system for pen-testing. I'm using the FreeRadius-WPE patch to collect Challenges/Requests from people who connect to my spoofed AP instead of the actual network. Here is the ...
-1
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3answers
725 views

help me about salting passwords

Eve has just discovered and decrypted the file that associates each userid with its 32-bit random salt value, and she has also discovered and decrypted the password file, which contains the salted-and-...
1
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1answer
6k views

Brute force password cracking with a GPU

How are GPU's provisioned for password cracking? Do all, if not most cracking programs have special GPU aware software or do they just function at the basic driver or API level of the device? Can it ...
3
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1answer
12k views

John the ripper passwd file format with salt not working

I'm trying test password strength in one of our e-commerce sites. I'm using john the ripper to brute-force a password file. The algorithm used by PHP is: $hash = md5($salt . $pass) No other ...
0
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1answer
1k views

How difficult is it to crack salt portion of hash

I write mobile application and I need to authenticate users against server. Server's side is written in php. I can't use cookies to store SID (Session ID), so I decided to send it at every request ...
2
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3answers
1k views

Password Security and ocl-Hashcat-plus

I recently read the Ars Technical Article about new features in ocl-Hashcat-plus. In light of questions like: Long Passwords: How are they more secure? and XKCD #936: Short complex password, or ...
25
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2answers
16k views

How does WiFi password cracking work?

Let's say I have a wireless network that is password protected. What procedures can an intruder take to gain access to my wireless network, or at least be able to decipher the packets I am sending ...
2
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2answers
683 views

Can AES-256 encrypted data be changed?

I have a file that supposedly contains AES-256 encrypted data. The file was created using a proprietary program that claims to use AES-256. I have tested decrypting the file with an open source ...
-2
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1answer
368 views

Can Cain&Able Crack SSL? [closed]

I have been messing around with Cain and Able and used APR on another computer (also mine) to get a hashed version of my username and password for my yahoo e-mail account, but I seem to be lost as to ...
5
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2answers
3k views

Would a massive blacklist of guessable passwords be useful? [duplicate]

Suggestions to make a good password all focus on creating a string that a computer (or more likely, a network of computers with multiple GPUs) can not guess. Putting a password meter for when users ...
8
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2answers
47k views

If hashing is one way, why can we decrypt MD5 hashes?

I have read some times that hashing is a one way function, that is you can make the hash of a message, but you can't recover the original message from the hash, just check its integrity. However, if ...
-2
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2answers
2k views

Can the U.S. goverment crack encryption? [closed]

Does USA government have the sufficient processing power to crack keys in matter of seconds? Let say 2048-bit RSA, for example. Since the RSA algorithm was developed by USA government (NSA?), I ...
3
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2answers
8k views

What exactly is 'single' mode in John the Ripper doing?

I'm testing out John the Ripper (1.7.9 Jumbo 7) on a file containing MD5 hashes without any usernames. I've been experimenting with different rules and configurations – I am currently using a wordlist ...
4
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1answer
1k views

RSA vs PBKDF2 for password storage (theoretical)

I know this is not the right way to store passwords, but I'm asking this from a theoretical perspective: Suppose a web site's passwords were encrypted with RSA asymmetric encryption and the private ...
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1answer
4k views

How long does it take to crack a 100-letter long winrar password? [closed]

i´m interested in how long time it would take for a super computer dedicated to crack to crack a 100-letter long winrar password. The password contains Lowercase, Uppercase, Digits, ...
3
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1answer
862 views

What is the entropy of just 1 Diceware passphrase like my passphrase?

A 5-word Diceware passphrase gives an entropy of 7776^5 = 3E19 = 19 Bans (or ~64 bits). Apparently monster cracking systems can currently guess passphrases for MD5 at a rate of 180 billion/sec (2E11). ...
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1answer
276 views

How can I crack ArrayOS password [closed]

I have some Array Load Balance device that the user password hash like: user "array" "XXXXXXXXXVkjTX9a1kYtNo". How can I crack the password or find out the algorithm of the hash?
-15
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1answer
2k views

Can a cracked antivrus software do the job? [closed]

Some of my friends say that their cracked antivirus software updates regularly, and does the job as same as a legitimate software would do. Is this possible? How do they bypass the activation key ...
7
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3answers
3k views

Password list generation

I've found during a lot of recent pen-tests that companies will use passwords like c0mp4ny@b( for a company called "company abc" Is there any quick and easy way to generate a list of passwords ...
2
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3answers
52k views

How long will it take to crack a 10-15 character winrar password? [closed]

Ok, long story short, I'm currious how long it would take an agency to crack a 10-15 character winrar password. The file names in the archive are also scrambled including a word at the start and ...
4
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1answer
17k views

How long it will take to crack a RAR password?

I wonder how long it will take to crack 16 character alphanumeric WinRAR password for a mini supercomputer. As far as I know graphic cards are preferred over CPUs to crack passwords nowadays. If we ...
2
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2answers
887 views

7zip AES encrypted archive, padding oracle attack

I created an encrypted but forgot the password. When I attempted a pattern based brute force it said it had over a 100 trillion passwords to check. And to my knowledge that could take a few years. ...
33
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2answers
37k views

Why are GPUs so good at cracking passwords?

What is it about GPUs that lets them crack passwords so quickly? It seems like the driving force behind adopting good key-derivation functions for passwords (bcrpyt, PBKDF2, scrypt) instead of ...
3
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1answer
2k views

Pointers for john the ripper rulesets

I've been pouring over the JtR ruleset documentation and making little progress. I understand how to use it to make various permutations from a given wordlist, that's fine. However, I'm trying to ...
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2answers
1k views

Password Protected Zip: if attacker had one file, can use it to decrypt all files?

Consider a folder containing the following files: (file1.txt, file2.doc, file3.pdf) all zipped and password protected, if attacker had one of these file, can use it for decrypting all without knowing ...
5
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3answers
1k views

Tools helps: First time cracking passwords

I am trying to crack passwords on two Windows member servers (2003 and 2008). There is no Active Directory. Each user seems to use the same password across servers, workstations, etc. I have access to ...
6
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5answers
85k views

Cracking CISCO ASA Passwords

I've got a copy of a Cisco ASA config and i want to crack the following example passwords I've got the following lines in the config ASA Version 8.4(2) ! hostname ciscoasa enable ...
7
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2answers
7k views

File security when encrypting files directly with the openssl command / and what about SHA1 hashing password first?

I've been using this command to encrypt files for a while now: openssl aes-256-cbc -a -salt -in secrets.txt -out secrets.txt.enc Then I type in a password. Can someone tell me, roughly speaking, ...