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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27 views

i need a help for john warnings [closed]

I'm writing C:\Users\asus\Desktop\john180j1w\run>john.exe The-Witcher-3.zip hash.txt and john gives me these : Warning: invalid UTF-8 seen reading The-Witcher-3.zip Warning: detected hash type ...
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1answer
46 views

Does john the ripper not support yescrypt?

I'm learning about password attacks using john and am trying to use it for bruteforcing my shaddow file. I created a user called newuser with password stuff and then used sudo unshadow /etc/passwd /...
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1answer
100 views

What are the security implications of the password policy for this bank? [duplicate]

I am aware of a bank (redacted for obvious reasons) that has the following password policy. Only English alphanumeric characters Min of 8, max of 14 characters No special characters (ex. !@#$%^&* ...
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164 views

I have been hacked on Facebook multiple times today alone. What do I do?

My Facebook account has had its password changed four times today, and I'm wondering what to do. The first time, was at 5:02pm. I received an email saying that my password had been changed. I recently ...
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1answer
94 views

What's the point of connecting to another machine with SSH to crack a password?

If anyone has heard of Ippsec and watched his videos, you'll see that when he extracts a password hash from a machine, he doesn't crack it in his own computer, rather, he uses SSH to connect to his ...
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1answer
188 views

John the Ripper is unable to crack my SHA1 hashed password

John the Ripper is unable to crack my SHA1 hashed password: john --wordlist=rockyou.txt testing.txt Whenever I do this in Kali Linux, I get this response: Loaded 1 password hash (Raw-SHA1 [SHA1 256/...
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112 views

Does John the Ripper automatically account for salt and hash?

I have an embedded device running Armbian which I was able to get the drive image from. The entry in /etc/shadow combined with /etc/passwd after unshadowing is this: root:$6$TV6ML2bG$TncnN/adtU9xaQs/...
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2answers
171 views

How does having a password hash speed up cracking vs not having a hash (on-site)?

On Windows, user password hashes are not salted and, on Linux, user password hashes are stored in the same root-owned file as the salt. Given this, in what ways might a bruteforce attack to find the ...
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1answer
74 views

Opening password file with John The Ripper

I have an old Windows domain SMB sniffer file circa 1998 and just out of interest I want to see if I can crack it now with John The Ripper. I believe the file was generated using the L0phtCrack SMB ...
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1answer
86 views

PAKE - What to do when a weakness is found?

In the case of a password hashing function like Argon2, I know that when a weakness is found, you use another password hashing function, wrap it around the existing hashes and calculate the hash of ...
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1answer
7k views

John the ripper password cracked or not?

I have the shadow file from an embedded device running linux. Trying to use John to crack it. There is only the 'root' hash in the shadow file. 12 seconds in, John finds the password for 'root', but ...
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How much entropy is needed for encrypting data locally?

I understand that, when storing data on the cloud or something else that might get leaked to the public, the security margin should be at least 128 bit, 256 bit should be used for data that should ...
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8k views

Does password length / complexity make any difference if hashes are leaked?

Password length/complexity only mitigates a brute force attack, correct? In the event of a hash leak, since any algorithm is a fixed length, there could potentially be a pre-image* with a very short / ...
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122 views

Using John the Ripper for Blockchain.info second password

Is there a way to use JtR for Blockchain.info's (v2) secondary password? I already tried the blockchain2john.py file, and it does not ask for primary password (which I know already) so it is going to ...
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2answers
131 views

Is it possible to reverse a hashed password? [duplicate]

Is it possible to reverse a password hashed with bcrypt?
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1answer
116 views

Hydra hangs after TASKS number of tries

I have dvwa set up and i am using the command: hydra -IV -t 1 -l admin -P rockyou.txt localhost http-get-form "/vulnerabilities/brute/index.php:username=^USER^&password=^PASS^&Login=Login:...
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Cain and Abel Dictionary Attack - How many words?

How many dictionary words in each attempt (e.g. "word1 word2") will Cain and Abel attempt to use before giving up? I've done some testing and my results seem spotty. For example I've seen it ...
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101 views

JTR finishing very quickly with rockyou.txt and not cracking the hash

I've been fumbling through the world of Information Security by going through the HTB challenges, and I've come across an issue I just can't seem to find an answer for. During one of the challenges I'...
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1answer
39 views

WEP keystream extraction

After having captured multiple packets with repeated IVs you can perform cipher1 XOR cipher2 which is the same as having cleartext1 XOR cleartext2, and performing cipher1 XOR cleartext1 gives you the ...
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144 views

Crack Windows 10 password with Cain and Able

A few months ago I reset my Windows password but my keyboard must have had a sticky key or two, effectively changing my password to an unknown password. Out of desperation and a little research I used ...
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2answers
130 views

Avoiding password cracking by using custom hashing procedure?

In summary: the idea behind password cracking is just to replicate the password validation procedure of a web server locally with lots and lots of attempts and check whether the output of that ...
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0answers
194 views

Hashcat first wordlist then brute force if nothing found

I'm trying to run my hashcat as automated and efficient as possible. I have a file with NTLM hashes: 607C4CDCDA0EFBF023C4DEA52DF90641 D25ECD13FDDBB542D2E16DA4F9E0333D AAD063F78DA1183CBD8BD7812FADF9C6 ...
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1answer
485 views

How best to crack password for MacOS encrypted .dmg, given I know the majority of the password content? [closed]

Encrypted .dmg on MacOS High Sierra, tested password before sending for repair. Upon return from repair, password does not work. The possibilities I see are the .dmg file is corrupted, or I'm wrong ...
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50 views

How much time will Fugaku supercomputer take to generate a wordlist? [closed]

How much time will the Fugaku supercomputer take to generate a wordlist? Length: 50 Combination: Alphabet(upper/lower) + numbers (0~9) also, would wordlist generators make a significant time/...
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169 views

Dynamic format used in John the Ripper jumbo way slower than MDXFind

I'm currently doing some research on a pretty huge list of hashes (approx. 2 millions) and thus I'd like to improve my cracking speed. The hash format is 12 rounds of SHA512(password + salt), which ...
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132 views

Hardware for password cracking

I'm planning to extend my pentest services to Password Cracking, to be more precise: Cracking Active Directory Passwords, extracted from the customers Active Directory in order to check users ...
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1answer
61 views

Does knowing part of a passphrase for sure really mean that you can “disregard” that entire part when trying to crack it?

Alice bought 1 Bitcoin and encrypted her wallet.dat in Bitcoin Core. Samantha, Alice's friend, notices the Bitcoin price skyrocketing and, while Alice is in the bathroom, steals Alice's wallet.dat as ...
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1answer
116 views

Password generation

I'm trying to generate all possible variation of a password. The base word is like "PleaseSub!" and I need all possible version of it with uppercase, lowercase, etc.. I know there is ...
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1answer
132 views

zip password cracking with permutation

I have a zip file (.zip created by 7zip v15.10) that I remember the password to (~12 characters long), but it seems I've typed the password wrong while zipping it and now it doesn't open. What are the ...
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2answers
2k views

How are website passwords cracked? [closed]

What approaches are there for cracking user passwords for website/e-mail accounts? can only think of three strategies, but what else? Algorithmically: Combinatorially attempting different sequences ...
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1answer
143 views

Can you bruteforce a SSH password without alerting the server owner?

What happened? This is a live event that a friend of mine is working on, a company's systems were breached by a Threat Actor (TA), when the Cyber Sec company was called in and tried to regain access ...
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1answer
75 views

How can the passphrase matter besides the very most obvious patterns? [duplicate]

Let's say that my passphrase is: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaapassword9 Yes, it looks ridiculous. But only because we already know it. An attacker, trying to brute-force their way into this ...
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24 views

TikTok's Password Character Limit [duplicate]

I've been making websites now for a while and when I've created websites or apps I've always put a minimum password size but usually a relatively large password size that isn't ever an issue for my ...
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1answer
182 views

Is using SHA256 to create 256bit secret key from bcrypt good ok?

I am trying to Use AES to store passwords for a password manager. For authentication I am already using bcrypt. As AES uses 256 bit Key can I use SHA256 to generate 256 bit key from hashed value of ...
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1answer
92 views

Knowing when a hacked password is correct

I was recently a victim of the any van data breach and so I started read up on password encryption and security - it is pretty amazing stuff. One thing that confuses me though is, since GPUs can now ...
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1answer
700 views

For bcrypt why is JTR so much faster than hashcat?

To keep it short I've recently been learning about hashing and password hash cracking on TryHackMe. I was tasked to crack the following hash: $2y$10$0veO/JSFh4389Lluc4Xya.dfy2MF.bZhz0jVMw.V....
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71 views

Isn't this kind of password ultimately secure and insanely easy to remember? [duplicate]

Pick any dictionary word. Think of a number over 10 and below 20. Repeat the word as many times as the number, and end off with the same number (for example, "12"). Example: ...
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1answer
278 views

Password cracking using Quantum Computers

Suppose that I have a password that is n-digits long. Each digit can take m values. So the number of permutations will be m^n. I wanted to know how much time it would take a quantum computer to crack ...
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How to assess security of Argon2 parameters [duplicate]

I would like to hash user password with Argon2id, then use this hash as ECDSA private key. I made some tests with Python and passlib.hash and found following parameters: memory: 32 MB iterations: 100 ...
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1answer
42 views

Wordlist generate: uppercase and each character appears only one [closed]

I want to generate a wordlist that contains only uppercase characters on length 8 and each character appears only once. Is there any way to do that?
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2answers
243 views

Hacking WPA/WPA2 passwords

Is there another method apart from using a wordlist to crack WPA/WPA2 passwords? because it's not going to work for all cases. Even using the biggest wordlist ever, there are cases where there won't ...
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24 views

Time it will take to crack a password file? [duplicate]

I'm trying to answer a multiple-choice question which is the following: "Consider the security of a password file, which includes a 10 bit salt and all passwords are hashed, but known to consist ...
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4answers
8k views

When passwords of a website leak, are all leaked passwords equally easy to read?

As far as I know, when passwords from a website leak, they leak in an encrypted form. Are all those passwords equally easy to decrypt? My hunch is that a 10-character-long password maybe gets ...
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2answers
705 views

Recommended length for WPA-2 password in 2020

I'm auditing my network setup and trying to determine an appropriate password length with a random set of digits and numbers. I found a Security Stack exchange answer but it was written in 2012 and ...
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1answer
94 views

Smaller password lists [closed]

I hack wifi passwords with kali linux on airmon-ng and I make always password lists with crunch but the lists are always too long (I'm talking about <100 PT) and I want to know if is there a ...
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1answer
140 views

What is the minimum secure length for gpg -c file.txt?

I want to use gpg -c with a user-generated password that I can easily remember. Are 16 characters enough? for example would a password similar to "I own 32 houses." be bruteforcable?
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35 views

Are there intrinsically weaknesses in accessing a same payload encrypted with different keys?

Assume we use AES256 to encrypt the same payload 100 times, each with a different key. An attacker gains access to the 100 encrypted payloads, and nothing else. Is there some way the attacker can gain ...
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1answer
173 views

How does john the ripper crack hashes using wordlists?

How does John The Ripper work when trying to crack passphrase of a private ssh key? As in what steps are involved when it tries to do so? What's the role of ssh2john in the whole process?
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2answers
87 views

Is there a utility you would use to create wordlists from directories and files? [closed]

I have a home directory and a gpg file I am attempting to brute force. Is there a utility that you know that will recursively create wordlist from directives and file contents?
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Making custom wordlists for languages besides English

I'm testing a site whose audience doesn't usually have English as their main language. When it comes to non-English, I consider there to be 3 groups The target language's alphabet is a subset of the ...

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