Questions tagged [brute-force]

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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Preventing Linux brute force concurrent su/sudo attempts

Its well known that popular Linux distros use the PAM default to slightly delay incorrect login attempts, thus mitigating brute-force attacks against a user account (for example, running su repeatedly ...
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Centralized brute force login detection using netflow data

Is brute force login detection feasible with netflow data? With the netflow data one could check the number of incoming packets to a specific destination port (for each flow). If the number is below a ...
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Bruteforcing via port 88 on MacOS

Macos has open port 88 by default. Is it possible to check validity of the password via this port from Linux and how? If the vncserver is active, it is possible to know also the username (by ...
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How much time is needed for bruteforce kerberos/ntlm?

My question is simply how much time an attacker needs for full bruteforce on typical complexity password policy given either kerberos ticket/ as req or Ntlm transaction. This depends on the ...
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How to recover forgotten AES-256 password with bruce force?

The password was set on a flash drive using LaCie Private-Public for Windows 10. The password is 12 character long. For each character, I know if it is a number, special character, lower case letter ...
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Using hydra on a website that has the same response for both a wrong and correct password

I got my hands on an old-ish residential gateway with SIP support and two analog phone connections. I want to use it for it's SIP support to use analog phones with my SIP provider. I didn't know the ...
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311 views

THC Hydra false positives on Foscam login

I bought a Foscam C1 Lite this week and I want to try to brute force the login page with THC hydra. But currently I am getting false positives with the following command: hydra -s 88 -l user -P ...
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656 views

Kerberos and brute-force attacks

Suppose that I am the administrator of a system that uses Kerberos and password authentication. How can I make brute-force attacks on user’s passwords by an attacker who can capture network traffic ...
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338 views

Why Aren't CA Private Keys Vulnerable to Brute Force Hacking [duplicate]

I have read a bit about encryption up to this point and understand that server certificates are validated by having a Certificate Authority validate that certificate contents match the digital ...
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No fields captured in BurpSuite

I am using burpsuite to bruteforce my routers login form, but I have encountered an issue... When I enter something into the password field, BurpSuite shows the request, but not what was entered. For ...
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Preventing a Brute Force Attack on API via limiter

I have an API that users can log into. I don't want it to be hacked. What if I limit each user to 60 requests a minute? Won't this significantly slow hackers down in a brute force situation?
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Brute Force with Hydra Ignore timeout and 4 billion limit

We are doing an assignment where we are hacking eachothers websites or servers in school. I know the default username and know the default password is 32 characters long to ssh in. While I know I ...
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354 views

Brute force email in JSON format

I have a parameter args=[490114,{"user_login":"user@example.com","":"","perm":"view","partners":[],"event_labels":[]}] in the HTTP request but in the encoded format. I want to brute force this ...
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Hydra http-post-form dosen't work even if i got right parameter

I use BurpSuite to capture post request like this. After that I use hydra with syntax like this hydra -l admin -P pass.txt 192.168.0.1 http-post-form "/login.asp:Username=^USER^&checkEn=0&...
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Is it possible to crack WPA2 faster than brute-force? If yes, how? [duplicate]

Does WPA2 have any weaknesses, flaws or gaps that would make a hack faster than brute-force possible? Maybe I can hijack authorized user's session or trick AP itp.
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Generating Rainbow Tables with Salt/Prefix [closed]

I would need a tool that would allow me to create rainbow table for custom password pattern. The pattern is 9-XXXXXXXXX where X is alphanumberic character and 9- is fixed prefix, as well as fixed ...
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Password Strength: Compound Words [duplicate]

I’m familiar with XKCD’s Correct Horse Battery Stable example but I am wondering about one aspect of password strength. Dictionary words are an easy target for password crackers. If you compound a ...
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Are AliPay password rules making it easier to guess a password? [duplicate]

I recently went to change my password at AliPay, and found out that there are a few restrictions on the password: It can only be digits It must be six digits It can not consist of consecutive digits (...
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660 views

Hydra hangs after 16 attempts

When I try to brute-force my router's admin page, Hydra is never making more than 16 attempts. After 16 attacks I receive only status updates with less and less tries per minute. Beside that, all ...
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263 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?
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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 ...
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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 ...
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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/...
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'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 ...
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THC-Hydra - one good pass = shows all valid [duplicate]

As in title. I'm testing my router security and I came up with problem. hydra 192.168.0.1 http-get-form "/:un=^USER^&pw=^PASS^:User Name or Password is incorrect." -L usernames -P passwords ...
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Brute-Force/Dictionary attack against encypted file using PBKDF2 key derivation

I have been following this very useful post by Thomas. My use case is slightly different. I am developing a mobile application which requires some sensitive data to be stored on the device in a SQLite ...
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Linux Hydra issue - random correct password success

I have an issue with Hydra when I use it. I have tried the same command lines given in guides directly supported by the Damn Vulnerable Web Application (DVWA) v1.8. Ok so.. here is my attempt output....
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Brute Forcing Domain Controller

I have a MS-Server2K3 domain controller that also serves as a Exchange server. Due to recent network speed loss and issues I began looking at event logs and noticed an exceptionally large number of ...
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How to prevent DirBuster to stop listing apache server side files

I have deployed a php project on apache. When I use DirBuster tool to scan my site, it lists all server side files. I want to stop this listing. I have modified the permission. When I give the less ...
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2k views

Distributed IMAP-Dictionary-Attack-Tool?

I have a client with a hacked IMAP-Account, and the attacker(s) made thousands of password-attempts, probably with a fixed set of passwords, from different IPs before they got in. After successful ...
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Is it security if an alternative of the full credit card number is stored in database

Short Description I am wondering if there is a way to store an alternative of the full credit card number securely, which the card number is not required to be retrieved from the alternative. Long ...
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4k views

Number of AES-256 operations per second on a maximized Cray XE6

How many FLOPs does one AES-256 operation take in ECB mode? How many AES-256 operations in ECB mode can a maximized Cray XE6 perform per second? Cray states that it can be scaled to over 1 million ...
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248 views

How often do brute force attacks find the password or key in a much shorter amount of time than the theoretical max?

For a 128-bit key, it would theoretically take many years and a percentage of the entire worlds power output to check every possible key, or for 256-bit it would take 3 sexdecillion years. But the ...
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556 views

Are passwords longer than 128 bits useless if hashed with MD5? [duplicate]

Are passwords that are longer than 128 bits useless if they get hashed/transmitted with MD5? MD5 always uses 128 bits, thus someone would rather try to bruteforce the MD5-hash than the password ...
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123 views

How does encryption force a processor to “pause”?

I'm often told that encryption forces processors to "make a pause" when performing the math to decrypt a hash, which is why brute forcing can take so long. I don't understand what it means for a ...
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308 views

Brute forcing - How difficult?

I'm doing a research project and I have a question regarding how difficult it would be to brute force something. Say there is a piece of text - "My name is James" Removing the whitespaces yields "...
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Why not crack a password a character at a time?

Brute force can be used to crack passwords by trying a large number of passwords. Why does no one try the brute force approach on every single character of the password instead?
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Is HTTP POST insecure?

Is it possible to perform a MITM attack or even bruteforce a HTTP POST? If so how does one perform an attack and how can a developer protect his/her site from such an attack?
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How can one prevent HTTP-authentication Brute Force Attacks, on PHPmyadmin with CSF-LFD?

I use PHPmyadmin (PMA) to manage my SQL based DB on an Apache environment secured with CSF-LFD (that as I know, also called "Fail2ban"). I don't want to protect PMA by limiting it to a certain IP or ...
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207 views

Why is it a problem to store strong passwords as unsalted hashes?

My users all have strong (80-bit true entropy) passwords. How do I know that? Because my imaginary website randomly generates the passwords for them (client-side). In that context, could you explain ...
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1k views

Bruteforce Passphrase of Dictionary Words

Consider the all lowercase passphrase: "lazy fox haggles treaty" Assume all four words are in a dictionary of 2000. Bruteforcing word combinations, how long does it take to crack this password at ...
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How can hackers get 1 billion passwords per second?

So I'm interested in Brute Force attacks and I have made them with Python 3 and C++. However, those only reached a max of about 20 million passwords per second. I know for a fact that 1 billion ...
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Should a CDN service like Cloudflare protect against Brute Force Attacks, or only from DDoS?

I know that CDN services usually protect a user by hiding it's original machine's IP and by screening (and banning) any attackers that send too many requests in the form of DDoS. But should a CDN ...
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386 views

Are ciphers with a strength of 112 bits considered weak?

SSL/TLS Ciphers of strength 128 bit is considered strong while ciphers of strength 112 bits is considered weak. Ciphers of 56 bit is understandably weak as they can be easily brute-forced. If it is ...
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953 views

Defence for brute force attacks to ssh

At some point in the past I had a small (physical) webserver. From day 1 there were brute force attacks to ssh. I looked it up a bit and I set up iptables to block IPs that try to connect to ssh more ...
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684 views

Can X.509 Authentication be subject to brute force attacks?

I am working on an application (using Spring Security) that has two possible user authentication mechanisms: either X.509 certificate (using mutual SSL handshake) or user + password For user+...
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932 views

Crack Linux password if you have plaintext and hash?

I have a relatively old Linux system, where password are not shadowed, therefore stored in /etc/passwd/. My question is, since I know the cleartext password, and its hash (looking at the passwd file),...
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Library or service for rate limiting credit card transactions by IP [closed]

I have a simple product ordering form. A hacker is attempting to validate stolen credit card numbers by making two orders per minute with a bot. 99% of the orders are declined but some are completed....
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532 views

Can a botnet be used to effectively break encryption keys?

Can a botnet amass and coordinate enough computing power to break encryption keys that are typically considered to be secure (through brute force)? If this is the case, do we need to make our ...
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Hydra bruteforce is giving wrong passwords. Can't seem to work any help? [closed]

Ok so what im actually trying to do is to bruteforce my own account on some website just to check myself . This is NOT for illegal steps or use , im trying to crack my OWN password , and im trying to ...