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Questions tagged [password-cracking]

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

3
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2answers
85 views

How to choose between password derivation or encryption?

Suppose you use a password manager having all possible features of modern password managers: encryption with a key derived from your master password, auto-filling, cloud or local storage, browser ...
0
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0answers
45 views

John the Ripper quits before cracking hash

I have a single raw-md5 hash that I want to crack. I've put it in a proper text file without a trailing linespace. I also want to use a wordlist for this. However, john exits before actually trying to ...
1
vote
1answer
223 views

Can a password cracker reverse engineer my generation method?

Lets say I generated a password with really awful entropy seed (5 bits~), but then used another selection process (with a low entropy seed as well) to select at random a method to generate a password (...
0
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3answers
107 views

Would it be more secure to enforce “at least one upper case” or to enforce “at least one letter (any case)”

I am devising a set of password requirements. I am requiring users to use the following: Minimum 8 characters Minimum 1 number Minimum 1 special character Minimum 1 letter (any case) I would like ...
1
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0answers
35 views

Increase password iterations?

Is it possible to strengthen the macOS login password by increasing the number of sha-512 iterations?
1
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1answer
51 views

How do Field Programmable Gate Arrays (FPGAs) compare to Graphics Processing Units (GPUs); for cracking hashes?

As a general rule, GPUs are more effective than CPUs when it comes to performing acutely repetitive tasks, like iterating over lists and generating permutations of a set (i.e. exhausting dictionaries &...
1
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0answers
59 views

How to create a keygen [closed]

I have a list with approx 500 serial numbers (each one with 10 digits) and all the 500 passcodes generated for those serials (also with 10 digits, but alphanumeric). Is possible to discover the ...
1
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1answer
39 views

Hashcat: How to discard words of length less than N after rules have been applied?

Hashcat: How to discard words of length less than N after rules have been applied? I know of the rules <N and >N that discards the word if its length is less than and greater than N, ...
0
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1answer
52 views

Both Ophcrack and ONTP&RE incorrectly show Windows 10 passwords as blank

I'm trying to crack a Windows 10 laptop that I myself set a password on a day or so ago. So far I've tried booting into Ophcrack 3.6 and ONTP&RE (Offline NT Password & Registry Editor) from ...
1
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1answer
74 views

Do hacks of mainstream web applications tend to happen more from random attackers brute forcing or from targeted heuristic attacks?

I'm writing up advice for selecting a master password for a password manager, and I'm wondering if there is available data about the likelihood of different attacks that result in a cracked password. ...
0
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1answer
132 views

Brute-Forcing DVWA login page with hydra

I'm learning how to brute force web login pages with a popular brute force tool called "Hydra". I'm using Kali Linux (VirtualBox) to do this. I've installed DVWA (Damn Vulnerable Web Application) and ...
1
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1answer
99 views

If someone has a hashed password, how long till they decrypt it?

Earlier my friend suggested that we have a race to see who could decrypt a hashed password first. I want to do it but I don't want it to be an all month thing. I know when passwords are hashed they ...
1
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0answers
38 views

How to brute force ARJ passwords? [closed]

I came across some password protected ARJ files. Can anyone name a password cracker for those archives? Ideally running on linux or OSX.
0
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0answers
39 views

rainbow-table which Reduction function is best or use both

Two Reduction function in rainbow-table known to me one = i H(P1) = X1, remove X1 remove all the value only left first few number Two - x mod N, mod method or Use both but if using both which which ...
-2
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2answers
219 views

What are most dangerous vulnerabilities of users of password management? [closed]

Are there any examples where something goes wrong. For example, say people misused password managers and got hacked or take some loss? If so how? Basically, I sort of know the typical vulnerabilities ...
1
vote
1answer
134 views

Are partial passwords a security improvement over full passwords?

With full password authentication, you need to enter the full password every time. With partial password authentication, you're asked for some subset of the password each time, and which characters ...
27
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4answers
10k views

Cracking double encrypted router password?

I noticed in the html of my router this parameter: form.addParameter('Password', base64encode(SHA256(Password.value))); So when I type in the password passw I get this via sslstrip: 2018-09-25 21:...
1
vote
2answers
197 views

John the Riper couldn't crack all the passwoords

I have a password file with 7 passwords, but JTR only could crack 4 and 3 that couldn't. What it's the reason? C:\tmp\john179j5\run>john --show shadow.txt root:password:12923:0:99999:7::: student1:...
2
votes
1answer
64 views

Is there any defense against this kind of attacks? (key comparison attack, or something)

is there any defense against this kind of attack? https://youtu.be/7U-RbOKanYs?t=974 I know someone who uses a password encryption hashing that generates the same length of keys as in this video and ...
1
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3answers
179 views

Hashcat doesn’t write to output file [closed]

I am using hashcat to crack a list of md5 hashes and have used the following command hashcat -m 0 -a 0 -o out.txt --force hashdump.txt ../rockyou.txt which gives the output Session..........: ...
0
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3answers
127 views

Assuming my password is strong enough, how else can I protect my account? [closed]

I'm a very insecure person, so I made my gmail account's password so long, that I started to question whether or not it's possible for someone to hack it with any given method (It's a passphrase with ...
1
vote
1answer
72 views

Best practices to protect public/private SSH key pair in web interface?

I've got a dilemma here: I'm working on a system that will connect to remote linux servers for monitoring and automating some processes. Since user+pass is insecure for obvious reasons and public/...
1
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0answers
52 views

crunch password generation with multiple character sets

I'm trying to use crunch to generate a password list. However, if I add all necessary characters into one character set, as in: file: charset_huge.lst complex = [...
1
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1answer
122 views

How to increase the time for an offline password attack

I am trying to answer a CASP exam practice question. Could someone comment on the options below regarding the logic behind each item? Where is the logical error behind each statement? A Storage-...
0
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2answers
435 views

Is it possible to crack Joomla hash password?

I'm a developer and suddenly I fall in a stupid situation like I need to crack a hash Joomla password which is (5aa154999c111bf7f33a1a3cadba5847) and I don't know the salt. is there any way to crack ...
0
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2answers
76 views

Generating multi-word passphrases from a wordlist

As part of pentesting NT hashes where the underlying passwords are minimum 16 characters of length, I have created a wordlist of common words, sports teams, movies, names, years etc. - inspired by the ...
39
votes
14answers
11k views

How can I make a strong password that's easy to remember? Is the 4 Word method safe? [duplicate]

I have heard of the method of using 4 random dictionary words, it gives you lots of characters and is easy to remember. But that seems to be open to dictionary attacks, especially if the attacker has ...
1
vote
1answer
81 views

hashcat specific brute force

Is this scenario possible: I know the first three letters of the password (exact), i know the password is between 10-14 characters, i know the rest of the characters are "b,t,p,1,3,6,7" which can be ...
0
votes
2answers
875 views

Most efficient way to crack a NTLM hash

I've been given a non-salted NTLM hash and a week worth of time to find the password it hides. I have also been told the password length is 11 chars, and that it is a Windows 10 user password. I'm ...
1
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1answer
506 views

Best tool to BruteForcing RDP

I have tried many tools and to do not seem to be successful with locking out an account I am testing on my network with an RDP domain. I used crowbar, ncrack and THC hydra but they don't seem to be ...
-1
votes
1answer
78 views

Where can i find a pre-computed 8 caracter uppercase password file/dictionary

To create an all permutations dictionary of an 8 character uppercase only password, I get I can use crunch to make this wordlist and file would roughly be 1.8 - 2Tb in size. Is there anywhere I can ...
0
votes
1answer
377 views

THC Hydra on Windows RDP Domain

I am testing a bruteforce on a windows rdp server within a domain. It seems to not be working because nothing is locking out the account I am targeting. How do you specify a domain username? I tried ...
2
votes
1answer
305 views

Crack Putty Private Key (PPK)

I found a private key which seems to be in the putty private key format. The key has the following header: ---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ---- Subject: <sensitive> Comment: <...
8
votes
1answer
832 views

Mitigating the new attack on WPA2 involving PMKID

A new attack was discovered which allows cracking a WPA2 passphrase without needing to capture the 4-way handshake. While this doesn't weaken the password itself, it does mean that an attacker can ...
1
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2answers
228 views

Finding and attacking an IMAP Server

For a security challenge I am supposed to dictionary attack an IMAP service. A rather simple exercise using hydra. So far I failed, since I've given hydra the actual website instead of the mail ...
2
votes
1answer
90 views

How to interpret the attempt information from Hydra

I was performing a Hydra attack on my TP-Link router and for that I prepared a passwords.txt file with 288 passwords. hydra -l webadmin -P test_creds/passwords.txt xxx.xxx.xxx.xxx ftp A minute ...
1
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1answer
65 views

Hydra not matching password provided in file

I was pen-testing my TP-Link router yesterday and tried performing a Hydra attack on it. I wrote the following line on the terminal: hydra -l admin -p passwords.txt 192.168.0.1 http The username and ...
0
votes
1answer
58 views

Crack Hashed Byte Array? [closed]

I know it would take forever to crack a simple hashed byte array, though for learning sake I was wondering whether it is possible to crack a hashed byte array? And if so, any suggestions how to do ...
1
vote
1answer
280 views

What is EAPOL payload in WPA2 Cracking?

I am currently working on a python script to crack WPA2. From this SO question: How exactly does 4-way handshake cracking work? I've all of the necessary fields as described, i.e. Addresses, NONCES,...
3
votes
5answers
263 views

What is the most secure way to store the password on a physical medium (paper, etc)? [duplicate]

Let's assume that I have to store the password on a material medium (paper, etc). What is the most secure way to do that? I mean a way of storing the password that does not needs any electronic tools ...
1
vote
3answers
850 views

Is it possible to crack any SHA1 hashed password

I'm trying to understand how easy it is to crack a SHA1 hashed password. I have a training database giving hundreds of password hashed. I have tried to use some online tools to crack them and I have ...
0
votes
0answers
26 views

After converting a .zip file to an .exe, can we get the password using a hex editor? [duplicate]

I have a zip file and was wondering if the password can be extracted. Like if I convert it to a exe file and use a hex editor to extract the password. How practical is this method? and also what is ...
1
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1answer
156 views

How can i fine tune hydra to find the correct password

I am having a bit of a pickle getting hydra to see the correct password when the page is redirected. The condition where the password is correct is if the login is redirected to a certain page in the ...
-1
votes
3answers
287 views

How to estimate the time for a hacker to crack a strong password

Some kind-heart hacker just sql-injected our website, getting the hash of admin password of 10 lower case chars. It took him half a day to crack it without knowing the SALT (he know that we use "...
9
votes
3answers
527 views

How could our passwords be cracked so easily?

We are saving password in a database using PHP: return hash('sha256', PASSWORD_SALT . $password); Recently a (fortunately) good hacker SQL-injected us and cracked some passwords including the admin ...
0
votes
0answers
52 views

AES Encryption Crack [duplicate]

i have some texts encrypted with AES/CBC/PKCS5PADDING algorithm and i've almost lost its encryption passwords, I want to know that this algo is CRACKABLE or not? and if CRACKABLE how can I crack it?
3
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3answers
135 views

Can one find the value of a “constant salt” if they can set the password and get the hash?

Saying we have an oracle that an attacker can use as many time as they want. The attacker can send a non-empty password to this Oracle. The Oracle hashes the password using sha256(password + pepper), ...
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0answers
135 views

Cracking Salted Peoplesoft Hashes

So I felt the saga of my last post was getting too long (linked here: Unknown round length makes hash uncrackable?) so I would create a new one addressing the current problem as it stands. My new ...
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0answers
83 views

Unable to display login username in Hydra

So I'm performing an authentication cracking lab using Hydra, I use the following command; hydra -L /usr/share/ncrack/minimal.usr -P /usr/share/wordlists/s1.txt -f -V 192.168.99.22 telnet The ...
3
votes
2answers
192 views

Is there a cryptographic disadvantage to applying bcrypt to an already hashed password

I originally asked this on stackoverflow, but due to lack of traction and a recommendation by a user there I have asked it here too. Imagine a scenario where a client application is sending a ...