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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2answers
113 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
259 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 ...
3
votes
2answers
33k views

Remove Password Protection from XLS Document

Similar to what is listed here, http://datapigtechnologies.com/blog/index.php/hack-into-a-protected-excel-2007-or-2010-workbook/, is there a way to remove the password from an XLS (Excel 2003) ...
1
vote
2answers
661 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
101 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 ...
2
votes
2answers
297 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
171 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
76 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 user'...
0
votes
1answer
68 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
3answers
167 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?
2
votes
3answers
158 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 ...
0
votes
1answer
131 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 ...
16
votes
5answers
3k views

What is the difference between login throttling and temporary account lockout?

I am currently working on the redesign of a login page. I have initially suggested that login be throttled whereby pauses (incremental - in number of seconds) are introduced between each failed login ...
1
vote
0answers
84 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
475 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 ...
2
votes
4answers
1k views

One-Time-Passwords resist against bruteforce attacks? Immune Alternative?

Does a One-Time-Password like Google Authenticator or YubiKey protect against brute force attacks with unlimited computer power? If not, what algorithems are immune to bruteforce attacks against ...
1
vote
3answers
121 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
188 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 ...
5
votes
1answer
153 views

Random padding in hash functions

In this answer, it was recommended that you add random padding when hashing messages for a trusted timestamp, such as for predictions, in order to avoid dictionary and brute force attacks (at least ...
3
votes
1answer
229 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 ...
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 ...
32
votes
7answers
31k views

Invalid users trying to log in to my server

I'm seeing a lot of log entries that appear to be failed login attempts from unknown IP addresses. I am using private and public keys to log in with SSH but I have noticed that even with private ...
1
vote
0answers
334 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 ...
2
votes
3answers
2k views

how long does it take to brute force varying encryption standards?

Let's say I want to encrypt information in a database. What would be the best encryption algorithm to use and why. I was thinking AES, since it's widely used as a government standard, but if the ...
3
votes
1answer
173 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
341 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
289 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 = urllib2.urlopen("http://www.demosite.center/...
25
votes
10answers
6k views

Best password strength checker

In XKCD #936: Short complex password, or long dictionary passphrase? Jeff claimed that password cracking with "dictionary words separated by spaces", or "a complete sentence with punctuation", or "...
5
votes
2answers
335 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
253 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
129 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 ...
5
votes
3answers
9k views

How can Facebook possibly stop a bruteforce attack on an account?

I've been doing some research on hacking recently and I found some very interesting tutorials on brute force cracking. I have some questions to ask and I'll be using Facebook as an example. Let's say ...
19
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 ...
4
votes
3answers
235 views

Why don't sites implement a system where a wrong password causes a 3 second delay?

I am into bitcoin right now, and the password threats scare me a little... Not so much for me, because I use LastPass and generate new passwords at 20 characters and it includes symbols, upper and ...
1
vote
0answers
618 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
122 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
3answers
3k views

What utilities exist to brute force a username and password?

I'm trying to persuade management to purchase two factor authentication for securing VPN and terminal server access. I've made significant progress by demoing TSGrinder, but would like to list other ...
95
votes
9answers
191k views

Where can I find good dictionaries for dictionary attacks?

I’m wondering where I can find good collections of dictionaries which can be used for dictionary attacks? I've found some through Google, but I’m interested in hearing about where you get your ...
3
votes
2answers
182 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 ...
2
votes
1answer
221 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 ...
1
vote
2answers
354 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
521 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
536 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 ...
10
votes
4answers
422 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 ...
1
vote
3answers
92 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
9k 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 ...
3
votes
1answer
155 views

Analyzing log files for forensics homework?

Suppose two users have done a murder at 6pm at Dunkin Donuts, I have got the hard disks on site, disk1 and disk2. How do I identify the time and order of each user's activities on the hard disks? ...
4
votes
4answers
1k views

Safety of Password Hashing Using bcrypt Done on Client Side

I am currently using a technique where I send the username/password in cleartext (using https) to the server, which then does bcrypt and compares to the db. Standard practice. It is considered safe. ...
6
votes
2answers
304 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
119 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} ...