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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16
votes
10answers
10k views

Crack hashed passwords using a known password

I'm a dev trying to deploy a new dashboard I've written at work, the old one is a mess of hacked together libraries and only about half of the codebase is still even in use (dead code everywhere that ...
0
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0answers
87 views

John the Ripper Custom Dynamic Hash Function Usage

I have created a custom dynamic hash function comprised of a series of different existing hash functions chained together. I'll spare you the exact details because it's for a class assignment. I've ...
1
vote
3answers
246 views

If no one knows a password, is there a reason to change it?

Scenario: A high level access account on a single machine, where the account is created by the system/application with a secure password, without exposing the password to a human or to any other ...
0
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0answers
34 views

How long shall a password be to resist a botnet brute force? [duplicate]

Imagine that I'm an evil genius, and I had the brilliant idea of creating a botnet for brute forcing passwords. Or I'm just the owner of the Echelon, and I have a farm of distributed servers around ...
0
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0answers
28 views

Is User Account Login Related to BitLocker Encryption Key

When I enabled BitLocker on my system-drive, I wasn't asked to select an unlock-method. I didn't have to enter any new passwords/keys. I only selected a few options for the encryption, and the process ...
1
vote
1answer
79 views

JohnTheRipper Advanced Mask

I have problem to construct advanced mask to crack hash of 7zip file. The password have 16 chars where are all lower, upper, decimal and !@#$%-_=+: Main information is that any char can't duplicate ...
3
votes
1answer
119 views

Can having certain restrictions/rules make passcodes less secure?

Say I have a phone whose security is corporately managed, and this management demands that I use a 6 digit passcode to lock the phone. So far, so reasonable. This gives an attacker a possibility of 1,...
0
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0answers
115 views

Logged in with a hacker's email address

I have an active account at ebay-kleinanzeigen.de (like Craigslist in the US). Today I got a valid email from them that my email address was changed. On my mac, I opened up my ebay-kleinanzeigen ...
0
votes
1answer
119 views

I don't know how to identify the method behind the hash [closed]

I found online an web app that is vulnerable to blind sql injection, I manage to get in users table and I looked at my password, in the table was the hased version, this one->57b0fcbe39b9336d, now I ...
3
votes
2answers
120 views

How strong is a password consisting of words arbitrarily chosen from the dictionary?

Diceware wants us to actually randomly pick n words from a given set of m=65 words. Assume a user does not actually use a dice. Instead they take a physical dictionary of m words and "randomly" picks ...
2
votes
2answers
130 views

Given Diceware, why does the requirement to contain uppercase, numerics & punctuation in passwords still stand?

Example strong diceware password: widow stout harvey crest zomba zloty butyl This password will be rejected by most sites, for example by Outlook.com. (Notable exceptions: Gmail, Stackoverflow, ...
0
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0answers
16 views

Is there any method to perform a classic dictionnary attack against wifi ap? [duplicate]

the wifi attacks require you "capture a session/ a handshake ?". Why can we do not simply use a classic dictionnary attack withouth trying to get the hash of the key. If i create a script who test the ...
2
votes
5answers
278 views

Can you avoid ever sending a password over the wire?

Let's say I want to secure authentication on a web app or a mobile app or even a machine to machine app. My first approach to secure the password is to enable HTTPS and some sort of client-side ...
2
votes
1answer
58 views

How does MariaDB's ed25519 auth scheme work?

Newer versions of MariaDB (a MySQL database server fork) have a new password based auth scheme called "ed25519". The docs are very sparse regarding how it works and what it does. https://mariadb.com/...
101
votes
3answers
18k views

Why is Sojdlg123aljg a common password?

I was going through the list of top 100K passwords and found Sojdlg123aljg near the top of the list. Does anyone have any idea why this is such a common password?
0
votes
1answer
67 views

differentiate correct and incorrect password [closed]

So here it is, I had time to kill, so I used it to hack into my own gmail address with THC Hydra. (very fun I know). So I checked out some old forums and gradually learned how to do it. I understood ...
-1
votes
1answer
114 views

Find Confirmation Code (FindBug.io) [closed]

I have solve half of the problem by decoding a base64 code that reveal the next URL(https://app.findbug.io/app/task/FinDBuG-CTF2019) but now i don't know what to find or where i tried it with ...
51
votes
7answers
15k views

Is this password scheme legit?

I received an invitation for an IT security fair (https://www.it-sa.de/en). They additionally delivered a password "Kryptonizer". That is a little card to hang on your keychain with the following (...
0
votes
1answer
110 views

Guessing speed in offline password cracking [closed]

What is the current speed an offline password cracking attack can be performed in guesses per seconds? It is for sure heavily influenced by the used hashing-algorithm and the used hardware. But I am ...
-1
votes
1answer
49 views

Is it beneficial to know the first char of a wpa2 hash [duplicate]

All I will need to check is AAAAAAAA - AZZZZZZZ. So I will only have to check the A's but will checking the A's be faster knowing the first char , I can't see why it would be as it would have to ...
1
vote
1answer
273 views

How long to crack an 8 character WPA2 hash if first char is known

I know the first char is A and it's all upper alphanumeric. Is there a way to estimate how long a mid level single GPU using hashcat would take to crack it?
0
votes
1answer
94 views

Security of adding letter in front of passphrase [duplicate]

I am wondering about the security of adding a letter in front of a long passphrase to help me have different passphrases for each site I use while not requiring me to remember several different N word ...
0
votes
0answers
19 views

60 character hex encrypted value with 32 character hex seed [duplicate]

Attempting to recover lost admin passwords from an old industrial control system database. We believe these have been encrypted rather than hashed (at least we know password version 0 for this system ...
1
vote
1answer
435 views

Combined-Dictionary attack with hashcat, for 4 words passphrases?

Reading the new advice on password which seems to spead easily (at least in my workplace), I was wondering how to use hashcat for cracking four-word password hashes? Say I have this hash ...
0
votes
1answer
132 views

Is a thousand character password worth the security on my personal accounts? [duplicate]

As for now: don't care about user experience, meaning that time spent reading, typing, memorizing password. not thinking about quantum computing attacks. 8 characters good, 24 characters better, ...
29
votes
6answers
5k views

The most secure way to handle someone forgetting to verify their account?

Suppose we send out email verification to new subscribers that where they have to click on a link to verify their account. Suppose they forget to verify it, and later try to login. Should the error ...
0
votes
1answer
140 views

Lost RAR password, is there any way to access my data? [closed]

I lost my winrar password of my file. I need to access it. Is it possible? If yes, how?
4
votes
1answer
239 views

BIOS Password vs. BitLocker Pre-boot PIN

I'm attempting to ensure maximum security for my PC. I'm running Windows 10 Pro on a business-class HP notebook. Unless I'm mistaken, I understand that both a BIOS password and the BitLocker pre-boot ...
2
votes
1answer
108 views

Does knowledge of one or more passwords from my password manager help an attacker crack the master password?

I use a keepass password manager with a master password of more than 100 bits. I keep the password file in cloud storage. If an attacker has my password file, it should be difficult for them to ...
55
votes
9answers
13k views

Are randomly-generated passwords starting with “a” less secure?

I generated a password recently for a new account and the first three characters were "aa1". After exhausting all other attacks, a cracker would start brute forcing. On the assumption they'd start ...
0
votes
1answer
47 views

Can't figure out input format for Hashcat salts with odd characters in salt

I have passwords that are stored by: Generating a random, 36-character "string" in the range of CHAR(1) to CHAR(256) Appending this to the entered password Retrieving the SHA512 hash of the result ...
2
votes
2answers
96 views

Does the use of a Hardware Security Module improve the security of a password storage?

Basic Assumptions Let us assume I work for a company, which aims to authenticate users using traditional usernames and passwords. The company currently uses a slow key-derivation function to hash ...
2
votes
1answer
98 views

When knowing an individual's plaintext password history, how much information is expected to be gained with a new password? Do we know this?

The premise: Knowing a persons password history should provide information to help when guessing a new password of theirs. At an extreme end, with a password history of wildcats, wildcats1, then ...
2
votes
1answer
138 views

How long are password hashes stored locally?

Suppose Alice logs into Windows machine M (which is part of an enterprise network managed through Active Directory). My understanding is that M will contact the domain controller to get Alice's ...
0
votes
1answer
881 views

Estimating Password Cracking Speed Based on GPU?

I was wondering if there was a calculator or formula I could use to find a rough estimation of the time it takes to crack hashes based on GPU. I am trying to assess how much performance I would lose/...
63
votes
1answer
13k views

I found a password with hashcat, but it doesn't work

My assignment required me to find the password for a PowerPoint file (97 - 2003, v. 8.0 - v. 11.0). I used office2john.py to retrieve the hash, and I removed the file name. The hash is: $...
0
votes
0answers
81 views

Where are NTLM and LM hashes stored in a password protected microsoft presentation file

I have a password protected presentation file (MS office 2003). My assignment required me to either remove the password or find it. In my research i found out that presentation use ntlm and/or nt ...
27
votes
4answers
6k views

Does putting salt first make it easier for attacker to bruteforce the hash?

Many recommendations for storing passwords recommend hash(salt + password) rather than hash(password + salt). Doesn't putting the salt first make it much faster for the attacker to bruteforce the ...
25
votes
3answers
6k views

How bad would a partial hash leak be, realistically?

Even though the current recommendation for storing passwords is the usage of a slow key derivation function such as Argon2, scrypt, PBKDF2 or bcrypt1, many websites still use the traditional hash(...
0
votes
1answer
91 views

How to make John the Ripper output example hashes for a given hash type?

Is it possible to make John the Ripper output example hashes for a given hash type given by the --format= option? This is possible using Hashcat, but currently I look in John the Ripper's source code ...
9
votes
1answer
3k views

What local resources are used when bruteforcing a remote service?

What pc resources are used when bruteforcing ? I mean bruteforcing something online, not hashes. Do you need a good amount a RAM and a good CPU or it's just about the internet speed ?
3
votes
1answer
228 views

Crack 8-char password with known number of set bits

At University, I got some CTFs to do for my security lectures. Basically, I need to crack an 8-character password (96 possible characters). I know that 42 of the 64 bits are set to 1 and I know the ...
0
votes
1answer
181 views

Limiting the number of duplicate character types in crunch

I'm trying to generate a password list of 10 character passwords containing only a combination of 3 - 6 numbers and 3 - 6 uppercase letters. I see option -d which allows a set limit of duplicates of ...
0
votes
1answer
126 views

Generating passwords with rule: the contents within a 10 characters string must maintain a certain ratio of numbers and letters in no particular order

I'm playing around with Kali and am looking to crack my WPA2 default password. I started generating 10 character passwords with a charset of solely digits and upper alpha lastnight and after 10 mins, ...
1
vote
1answer
83 views

Is there any methods available other than brute force and dictionary attacks?

I am curious to know about the wifi attacks. And I have known a little bit about brute force attack and dictionary attack. Is there any other methods available other than these two...?
1
vote
1answer
185 views

Using BITMAIN AntMiner L3+ for cracking password [closed]

I want to use a BITMAIN AntMiner L3+ miner to crack passwords. How can I do that? Can I install hashcat agent to L3+ ?
0
votes
0answers
64 views

Cracking Zip File Password Encryption [duplicate]

Hey all I am currently taking a computer security course and while doing some research in cryptography I found that it was possible to crack the encryption of a password protected file in an encrypted ...
1
vote
1answer
85 views

Will SIM‐like PIN on website as second password increase security

On SIM cards, which are used in mobile telephony, PIN (and PUK) is used. Unlike a password, they are locked after some incorrect attempts to prevent brute force attack. If wrong PIN is entered 3 times,...
0
votes
0answers
18 views

Security risks in confirming the username instead of confirming the username and password combination [duplicate]

Most of the login pages like Google, Outlook and Yahoo! confirm the username first and then ask for a password instead of confirming the username and password combination altogether. Isn't it less ...
3
votes
2answers
317 views

Is haveibeenpwned (HIBP) free and reliable? [closed]

I have just started to explore HIBP to check whether we can use HIBP in our public facing interfaces. AS per my read I have 3 options to check out. Download the password dictionary and implement my ...