An attack using every possible input to attempt to produce the correct output. Typically the method of last resort when no weakness allows the use of a more restricted input set. E.g. trying all possible (or likely) passwords, in an attempt to guess the correct one.

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-2
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3answers
220 views

Hydra producing fake login passwords

I'm trying to "hack" (login) into my own HTTPS website account through Hydra. Therefore, it is 100% legal. Hydra keeps producing tons of incorrect passwords. This is the code I use: hydra -v -V -l ...
0
votes
0answers
90 views

Hydra command for cracking a webpage which uses <span> tag for failed login attempts

I'm trying to for crack a simple webform for testing hydra in Kali. When the webpage encounters a wrong username and password combination it pops up a message using the following html code:: ...
0
votes
1answer
216 views

ISP has informed us that our server is launching brute force attacks on WordPress sites, how do we end this? [duplicate]

Misc Situation: -Server login is obtained by hacker, hacker places malicious brute force file in /hacked/bruteforce/ -Server password is then changed, hacker can still run script by navigating to ...
1
vote
1answer
78 views

How effective are firewall rate limiting rules for slowing down brute force and DOS attacks?

I am investigating methods to slow down the rate at which attackers can make brute force attempts against my webserver's SSH and HTTP services. I have come across many articles as well as the ...
1
vote
0answers
71 views

How secure is Asus router latest framework function: “Added protection mechanism for GUI login brute-force attack for login username and password.”?

I have just updated my RT-N12 D1 router to the latest framework, and it has new function - "Added protection mechanism for GUI login brute-force attack for login username and password.". I Googled and ...
0
votes
1answer
161 views

Test a known list of possible Windows Remote Desktop credentials?

I've forgotten my password to my home server. It's a new Windows 2012R2 VM, I didn't change the maximum password age requirements in Group Policy DC (even tho I know I should have) until it was too ...
2
votes
2answers
185 views

Why do websites force the user to use a long and complicated password when brute force isn't possible?

if you have a phone with 4-digit pin and the phone does not get locked no matter how many times you put the wrong pin it makes sense to use 10 or 16 digits as it'll increase the time the attacker ...
4
votes
3answers
298 views

Can using emojis make someone's password safer?

I was just thinking about this the other day, after reading about making safe passwords, you have a few options: The first would be, adding numbers, or something other than just a word ...
5
votes
1answer
185 views

Is there an equivalent of an Apple cryptochip in Android devices?

Apple has a cryptochip which, beside managing the encryption keys, tunnels authentication and provides throttling of failed attempts, as well as the ability to trigger a device wipe after several ...
2
votes
2answers
99 views

REST Services: Limiting the concurrency of a login endpoint

Scenario: A botnet is recruited to try to authenticate against a website or service with each bot trying infrequently using a common password and a list of 'real' email addresses, avoiding the ...
2
votes
1answer
198 views

Bruteforcing an iOS PIN

The iOS Security document describes several security mechanisms implemented in iOS 9. I am specifically interested in the actual security of a 4 digits PIN on iOS. I am looking for tangible ...
1
vote
2answers
634 views

What would be the most efficient way of brute forcing a wifi key [duplicate]

I was wondering how can a brut force of my wifi be prevented so I want to know the best technique that can be used to brute force it first, so protection isn't my question. My question is: What brute ...
2
votes
2answers
100 views

my bruteforce prevention has major downsides - any ideas?

I'm currently searching for the best way to prevent my software's webportal from bruteforce attacks and came up with the following idea: 3 login attempts without any visual challenge after 3 failed ...
0
votes
2answers
216 views

Do you need more then 128bit entropy

UUID use 128 bit numbers. Currently it is not feasible to randomly produce two UUIDs that are the same. Does that means 128 bits of entropy is suitable for all cryptographic operations? I would ...
-4
votes
1answer
156 views

is there any playground for brute force? [closed]

Is there a site where i can make an account and run my brute forcer to check it for infinite attempts? Something which does a HTTP request and no javascript submit.
2
votes
2answers
70 views

Isn't ssh-copy-id exposing to a brute force attack?

It is a common knowledge, that using keys to authenticate ssh users is more secure than using passwords. However, even with password login disabled, when running ssh-copy-id I am still asked for ...
1
vote
1answer
130 views

Yii client side captcha validation

Apparently, Yii web application framework generates some kind of hash value from captcha codes it generates and sends it to the client side so it can be used for client side validation of the captcha ...
0
votes
1answer
63 views

Can an old fashioned crypt encrypted file be brute forced, if so how?

If I encrypt a file using the old Unix/Linux crypt() function, how can it be decrypted or attacked? I understand how a password file (for example) is attacked, you guess passwords, run them through ...
2
votes
2answers
318 views

How can I make wordlist smaller size?

I've been thinking if I create numeric 8chars wordlist and then compress it, can I directly input compressed wordlist into aircrack-ng or is there a way to make a smaller size wordlist, because if I ...
2
votes
3answers
147 views

Does brute forcing require a password and username list?

I have been learning metasploit. One thing I noticed was that, all the videos on YouTube, which said "Brute forcing", used a password and a username list. My question is that, won't this be called a ...
2
votes
3answers
164 views

What prevents a coder from brute forcing a wifi?

I know that a coder is able to connect to a wifi through code so my question is: Is there anything that will make it difficult to brute force a wifi password?
0
votes
1answer
125 views

Ignoring collision and (second) pre-image resistance, what makes a cryptographic hash function strong?

With regards to resistance against dictionary and brute-force attacks to "crack" hashes containing passwords, what determines the resistance of a cryptographic hash function? Since collision ...
1
vote
0answers
76 views

Connect to a wifi through code [closed]

Is there any way a person could write a software using for example C++ to connect to a wifi completely by using code?
1
vote
1answer
320 views

How to use the standard (non-dictionary) brute force attack on FTP in THC-Hydra?

In the process of attempting to secure my local LAN, I have determined that I am at little risk of a dictionary brute-force attack. This being said, a standard brute-force attack which involves ...
1
vote
3answers
118 views

How to protect from DoS on get method?

Suppose I have a website and I want to make sure that a hacker isn't making my server down by utilising a DDOS attack on my website. I thought of getting IP address and revoking the access, but it ...
2
votes
3answers
174 views

Feasibility of time-based database brute-force attacks on websites

I recently learned that there is an attack that utilizes the fact that when brute-forcing a compared string (e.g. hash from a password or token) in a database the query fails a few nanoseconds earlier ...
20
votes
4answers
5k views

Would allowing shorter passwords sometimes be more secure?

Does the act of requiring certain criteria for passwords make them easier to brute-force? It's always seemed to me that when websites limit the use of "insecure" passwords, it might make it easier ...
1
vote
0answers
286 views

Storing Social Security Numbers in a Database

I'm developing an online application that needs the user's social security number. The application won't be processed on the web server so I'll be using an asymmetric key. So a compromised web server ...
3
votes
1answer
150 views

Is a large encrypted file more secure than a small one?

Does encrypting a large file and subsequently having to decrypt a large file make it more secure than a small one when attempting to brute force it? If you have to brute force a 25GB file and a 250MB ...
3
votes
1answer
221 views

Writing your own John the Ripper module

I have a script in C, which is able to determine the password of certain data. It uses HMAC and RC4 algorithms to encrypt the given password and then compares that later to the given data. If they ...
3
votes
1answer
301 views

How secure is Scrypt, really?

I've been recently taking a hard look at the scrypt system for storing users' passwords. However, I'm rather worried about it's security because of things like Litecoin miners. Is scrypt secure ...
1
vote
1answer
261 views

Brute force attack [closed]

I'm trying to make a simple script (brute force attack) on Joomla to try if it works. #! /usr/bin/python import re #regex import urllib import urllib2 x = ...
5
votes
2answers
304 views

Detect when I do brute force attack and block the connection

My server (Ubuntu + LAMP) is infected, as I receive security alerts from the sites attacked from my IP. your Server/Customer with the IP: ********** has attacked one of our servers/partners. The ...
3
votes
2answers
227 views

How to generate a password dictionary for a specific use

I have a locked work file that I need access to. Unfortunately, the company that provided the file is no longer in existence and I can't track anyone down to help me out. The file is encrypted and ...
1
vote
3answers
126 views

Is my approach good enough for brute force protection

I don't particularly want to implement Captcha on my login form for a website. But I've got a block mechanism already in place. What's the best way to protect from Brute Force attacks? Here's what ...
18
votes
4answers
4k views

Should I implement incorrect password delay in a website or a webservice?

With arguments expressed in this answer, there is a few seconds delay between user enters an incorrect password and when he/she actually learns, that password was incorrect. This security solution is ...
1
vote
0answers
488 views

'http_login' metasploit module isn't able to Brute Force the target. Any suggestions? [closed]

I'm trying to Brute force the http Basic authentication on the domain pentesteracademylab.appspot.com The complete path is pentesteracademylab.appspot.com/lab/webapp/basicauth I'm using the ...
0
votes
1answer
111 views

Prevent brute force attacks on web publishing logins

Presumably, if someone tries to brute force into your website's control panel at your web host's site - they will be throttled/locked-out etc. But what about the web publishing logins (Web-Deploy, ...
3
votes
2answers
159 views

Calculating the time required to brute force a random code

Say we have amount random entry codes of length characters from an alphabet of size alphabet. The number of possible codes is then easily calculated as keyspace = alphabet ^ length. Now take an ...
1
vote
2answers
291 views

Public/private key auth and VPN

If a server uses public/private key authentication to access SSH, will there be any advantage of restricting the access of SSH over VPN? This link describes both approaches to solve brute force ...
0
votes
2answers
332 views

Brute force time estimation - random sequence

I would like to ask if there are 2^1000 possibilities to choose from, how long would it take go through them all on average? (in terms of min, hours or years) Note: This is not necessary related to ...
1
vote
1answer
463 views

Can Hydra and Crunch be used in combination for HTTP-get-form? [closed]

I'm trying to recover my router username and password without resetting the router for educational purposes. I read that Hydra can be used for "brute-forcing" http-get-form authentication that most ...
2
votes
1answer
208 views

How much does knowing the zxcvbn password strength help an attacker?

On an answer to the question How critical is it to keep your password length secret?, Mike Ounsworth commented that by storing the zxcvbn-calculated entropy of a password you make it easier for an ...
95
votes
11answers
13k views

How critical is it to keep your password length secret?

Is keeping your password length secret critical to security? Does someone knowing that you have a password length of say 17 make the password drastically easier to brute force?
6
votes
2answers
285 views

Do I REALLY need to change my LastPass password?

Last weekend LastPass' network was compromised and that a list of email addresses along with the hashes of the master passwords were stolen. It is being recommended that LastPass users change their ...
0
votes
0answers
112 views

Would it take long to brute force a md5 hash like this?

1be8917510-36.51929856278002 10bce1af27-99.18403192423284 103fa11cc6-87.21158325206488 Few examples above and as you can see the pattern is: 1xxxxxxxxx-{a percentage (0-100) to 14 decimal places} ...
7
votes
3answers
1k views

Why do we have such big keys?

In Chapter 7 of Applied Cryptography, Bruce Schneier claims that, due to thermodynamic limitations, "brute-force attacks against 256-bit [symmetric] keys will be infeasible until computers are built ...
1
vote
3answers
91 views

How can hackers access WordPress usernames? [duplicate]

Recently I've had brute force attack attempts on some of my WordPress sites and the attackers are using actual usernames other than the default admin (which was removed). How is it possible for them ...
20
votes
4answers
8k views

How is Gmail susceptible to brute-force attacks?

In the Atlantic article "Hacked!" it says: My wife’s password was judged as “strong” when she first chose it for use with Gmail. But it was a combination of two short English words followed by ...
10
votes
4answers
408 views

What are the drawbacks of login request throttling?

In a web application, one way to protect against password guessing attacks is to lock out accounts after a set number of failed logins. This could be done on both source IP address and username. For ...