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18
votes
2answers
10k 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 ...
12
votes
3answers
5k views

Cracking MS-CACHE v2 hashes using GPU

As most people here will know, Windows caches domain/AD credentials in a format known as MS-Cache v2. Obviously, these would be excellent passwords to gain during a penetration test when local access ...
6
votes
2answers
337 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 ...
5
votes
3answers
820 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 ...
5
votes
5answers
24k 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 ...
5
votes
1answer
424 views

Is there any malicious reason to block CRLs?

I've noticed that in order to 'illegally' crack certain applications, it is necessary to patch the host file to stop communication with the activation servers. I've found that with several ...
4
votes
1answer
241 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 ...
4
votes
1answer
113 views

Tracing Wireless Card

Let's say that hypothetically someone had broken into a WiFi connection. We can't find any evidence of whom it is via sniffing the traffic or anything of the sort. Is there any way to triangulate ...
4
votes
2answers
2k views

Is it possible to crack a PIN / PUK code on a phone SIM card?

When deploying a mobile phone best practices policy, one of the points which were raised was the requirement for the user to protect his SIM card with a PIN. The theory is that three failed attempts ...
4
votes
2answers
571 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 ...
3
votes
5answers
2k views

How can I secure my wireless network from neighbor's password-cracking attempts? [closed]

My neighbor wants to crack my Wi-Fi password with a nutcracker. How can I secure my Wi-Fi please? Should I call the police? I tried to put a activate the protection by MAC address, but now my ...
3
votes
2answers
192 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
votes
2answers
2k 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, ...
3
votes
3answers
141 views

Should you notify software vendors that their software has been cracked?

Apologies if this is not the right place to ask this question, I will happily move it to another Stack Exchange site if need be. Before I explain the rationale behind the question, let me clear up a ...
2
votes
2answers
675 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 ...
2
votes
2answers
409 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. ...
2
votes
1answer
3k 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
votes
2answers
287 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 ...
2
votes
2answers
996 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 ...
2
votes
2answers
781 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. ...
2
votes
2answers
286 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 ...
2
votes
1answer
317 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). ...
2
votes
2answers
137 views

Is AES encryption vulnerable?

I was reading weaknesses in AES encryption. Unfortunately, I have a website that uses AES: Its database is almost entirely AES encrypted. Is there a real threat? Would it be worth to refactor the web ...
2
votes
1answer
102 views

find passphrase on encrypted ssh private key

I have an openssh encrypted private key. I don't remember the pass-phrase. I may be able to suggest words or patterns that may be in the phrase. I am looking for software that will help me recover ...
2
votes
2answers
119 views

Obstacle in Implementing a Time Limited/Number of Use Limited Software

How does one implement a trial period in a product properly, e.g. a trial period that lasts 30 days, or limits the number of product uses to 10? Storing the entries, even in an encrypted form, isn't ...
2
votes
0answers
204 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
vote
4answers
140 views

Is it ever possible to crack an encryption key character by character?

In movies and TV shows, characters are often depicted using devices and applications that are able to determine an encryption key or passcode character by character (or digit by digit). I am a ...
1
vote
2answers
100 views

Brute force alphanumeric password using JohnTheRipper

I recently recovered a zip archive with some files I need access to, but I can't remember the password. All I can remember is that the password was short (around 3-4 characters), and contained only ...
1
vote
3answers
483 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 ...
1
vote
3answers
160 views

Cracking passwords after a patteren with ex. 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 patteren. ...
1
vote
2answers
741 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 ...
1
vote
2answers
83 views

Database compromised and some passwords cracked

I run an MMORPG game and today while moving from one server to another, apache failed and listed some of the data on the server including a back-up of all the source code + database which a few people ...
1
vote
1answer
907 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 ...
1
vote
2answers
74 views

Password Cracking Mandarin Words English Character Set

I'll be looking to perform a domain password audit in which the user will be using english characters but may be 40% Mandarin speakers so I anticipate a large number of names, phrases, or words that ...
1
vote
1answer
428 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 ...
1
vote
1answer
90 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 ...
1
vote
1answer
1k 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
vote
1answer
127 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 ...
1
vote
1answer
2k 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 ...
1
vote
1answer
2k 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 ...
1
vote
1answer
394 views

Examples for practicing reverse engineering/disassembly of win32 .executables

I remember back in the day, there used to be a website where users would post hackits in the form of win32 exes for users to crack. Usually the goal was to defeat some sort of DRM, such as a nag ...
1
vote
1answer
456 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 ...
1
vote
1answer
79 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 ...
1
vote
1answer
110 views

MySQL Authentication Hash Cracking

I'm currently conducting research regarding MySQL server remote authentication. I've captured unencrypted, not compressed authentication packets between the client and the server, where username is in ...
1
vote
1answer
188 views

John The Ripper 1.7.9 Jumbo Cracking SSH Key Help [closed]

According to John The Rippers wiki page, John's Jumbo edition supports many new non-hash cracking options like ssh keys, gpg, variety of browser password managers, and many more. From the site I ...
1
vote
0answers
59 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 ...
1
vote
1answer
857 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, ...
1
vote
0answers
64 views

Can ophcrack crack credential files

i have obtained some credential files from another pc and would like to decrypt the credential files. These are the ones found under local/roaming profile in Appdata folder ...
0
votes
2answers
4k 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 ...
0
votes
2answers
78 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 ...