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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What are the common features to identify Brute-Force attack from Apache log file?

There are various methods to find attack patterns for different types of attacks. Apache-scalp is one such tool, but the rule set is not available to find the brute-force attack pattern via regular ...
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how to get cookies from aspx site to use it with hydra

I've been playing around with Hydra and .aspx site and I've hit a bit of a snag - Hydra responds letting me know that the first 16 passwords in my password list are correct when none of them are. ...
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How does Amazon secure its 6 digit one-time password?

I noticed that Amazon's password reset relies on a 6 digit numeric PIN. Doesn't this reduce every user's account to a 1 in 10^5~ chance of being accessed through brute force guess factoring in a few ...
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Calculating permutations of a hexadecimal character set [closed]

How long would it take to run through all permutations/combinations of a ten character set; assuming the character-set is limited to a hexadecimal alphabet? (i.e. 16 characters {0..9}{A..F}; eg. ...
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How to brute force a Java Applet in browser?

I am solving a CTF challenge and it is multi-layered: https://net-force.nl/challenge/level314/ (Modern browsers don't support Java Applets anymore and I had to download Opera browser 9.x to run the ...
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how do i find the number of possible keys / password to decrypt a plain text

i like to know if there is any way to decrypt a plain-text that is encrypted 55 rounds using Caesar ciphers with different key for each round. and using brute force attack without knowing the length ...
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Why can't Hash Suite list the username/hash pairs in my SAM file?

I recently started experimenting with Hash Suite Pro (v3.5.1). This is a Windows program that tests the security of password hashes. A problem that I'm already running into is that Hash Suite is ...
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Can bruteforce attacks be prevented with tables of valid inputs?

Can this method of encryption prevent bruteforce attacks? If I had a hypothetical table (or function) where every grammatically valid sentence (limited to some number of words) was given an ...
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wfuzz default number of connects in parallel per target?

In Hydra, default number of connects in parallel per target is 16 and it can be changed with -t flag. E.g. -t 100 for 100 connection in parallel per target. wolf@linux:~$ hydra -h | grep parallel -...
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wfuzz show --hs responses when it should hide it

Test site: http://testfire.net/login.jsp Error when login failed: Login Failed: We're sorry, but this username or password was not found in our system. Please try again. Web Form <form action="...
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Is single iteration SHA-256 safe enough for hashing 128bit random number API keys?

I implemented this kind of authentication for my REST API, is this secure and is my logic sound? I am primarily curious about the SHA-256 hash & iterations = 1 aspect. I have omitted some details ...
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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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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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Is it feasible to recover a zip file password consisting of about 16 digits?

A friend of mine lost the password of a zip file of her. She remembers that the password contains digits only (that is, only 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9) and is 16 characters long or so. The ...
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Is it possible to guess cvv code from payment number and expiration dates?

If I am not wrong, visa is easy to guess cvv right? Let's say if I have 100,000 credit card numbers and expiration dates, it is possible to make daily 5 guesses. All cards with 5 the same gateway/...
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Difference between gobuster and dirbuster in performance

The only difference I am aware, is of CLI vs GUI. But I am curious to know as to what is the difference in their performance and what are the additional features in one tool compared to another?
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Why does THC Hydra and Medusa give false positives when used on TP-Link Netcam?

One of the tests I carried out was brute-forcing. I already knew what the username and password was for a factory reset IP Netcam but wanted to see how it would work in practice and if it even worked ...
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Getting encrypted password

I have seen many hackers bruteforce password for gaining access to social media. In famous Mr Robot series it is shown that Elliot(main character) brute forces people and the password is displayed on ...
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What's the purpose? Strange login attemps “sshd[***] Received disconnect from **.**.**.**: 11: Bye Bye [preauth]”

I've seen something like: sshd[***]: Invalid user oracle from **.**.**.** // 1st line sshd[***]: input_userauth_request: invalid user oracle [preauth] // 2nd line ...
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Bruteforce all IP addresses on network with Hydra

I have been tasked to pen test a computer on my network. I have done some social engineering to get the username and password of the device, and I know ssh is open on the computer. However, I do not ...
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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 ...
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Hydra fails with “[ERROR] target ssh://192.168.16.128:22/ does not support password authentication.”?

I've updated Kali 2.0 to newest version - it is installed using VMWare. Now, every time I use hydra to brute-force SSH, I get the following error: [ERROR] target ssh://192.168.16.128:22/ does not ...
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Prevent subscription ID guessing

I am working on a service which offers information on the road traffic situation. Users can subscribe to the service via an API, indicating the area and road classes they are interested in, and are ...
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How unlikely is it that a Google Doc link is guessed?

Most (if not all) of us know that a Google Doc link looks something like this: https://docs.google.com/document/d/13P3p5bA3lslqEJT1BGeTL1L5ZrQq_fSov_56jT9vf0I/edit There are becoming several tools (...
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How did the brute-forcers get my IP address so quickly?

This is probably a massive noob question, but Google results aren’t being helpful and I couldn’t find something specific here. I made this server that just hosts IRC, HTTP and SSH for some friends. I ...
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Bruteforce on 10 characters length WPA2 password

I'm trying to hack my own WPA2 network for learning purposes. I have the *.cap file generated by aircrack-ng tools after a WPA handshake. I've tested by including my own password and a bunch of ...
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Using Patator ssh_login module how can I get the output to show only on success

I have the following command: patator ssh_login host=<ip> port=<port> user=<user> password=FILE0 0=<path to pwdlist> I would like to output the success result only and not ...
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How does winrar know I typed the right key?

As far as I know WinRar uses the password you type and derives the key from it. But how exactly does it check if the key I typed is correct? What I think is that it compares your guess with the right ...
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How can one mitigate both account-level DOS attacks and online brute force attacks at the same time?

I was recently reading this question, where the accepted answer claims that it is easy for attackers to bypass rate limiting that is based on IP, which makes any sort of IP rate limiting to prevent a ...
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Tool to try and brute force decrypt a string by trying common algorithms? [duplicate]

I've got a string that I believe is encoded with a rather basic algorithm, but rather than trying them all 1 by 1 I'm wondering if there's a tool/website that can attempt to decode it using multiple ...
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Bruteforce different encodings

I have a hash $office$*2013*100000*256*16*664f9e0787392c2b1632d3947aaadee4*27dc7d029f76244a407acf9b5afa3740*ebbc055ae08124f6a6be81ef812da4fece16b2ad86eede3916d9cda15f71833f password: лl My wordlist:...
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Hydra Brute-force attack on Gitlab doesn't work!

I'm using hydra to test my organization's security since our GitLab is accessible online, I wanted to make sure the security of the login itself before implementing other types of security measure (e....
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Name of 'smart brute force' attack against sequential cipher lock [duplicate]

I remember learning about an attack against sequential cipher locks - ones that don't have a 'reset' or 'enter', you just enter digits and as soon as the last n consecutive entries match, the lock ...
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Hydra - all passwords work

I want to test some mechanisms of my website when the password of a single user is entered a lot of times in a short time incorrectly in the login form. Therefore I got Hydra (for windows) on GitHub. ...
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Preventing automated attacks on Tokens without relying on Firewall or Network Infrastructure

Our concern is more on application side prevention automated attacks. Although the firewall does it part to help prevent this, it has been mandated in our development team's security practices that we ...
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Does it matter if a brute force search for a password returns a collision and not the password?

Assume the following very basic hashing algorithm. h(k) = k mod 17 Let's say we create a password 12345 for a website that uses this very basic hashing algorithm. That would yield the hash of 3. ...
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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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Cracking a JWT signature

I am testing an API that uses JWT for authentication. This JWT has a HS256 signature to prevent modification. I figured that if I determine the secret key used in this signature, I can create my own ...
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Solution for password spraying on my app

We have a web application where the input fields for login are: username and password. In order to prevent brute force attacks, we have implemented a lockout function for 5 invalid tries of valid ...
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How to protect WordPress from brute-force attacks?

One of my WordPress sites is being constantly attacked with brute force. I have the WordFence and Clef plugins installed. The number of login attempts is limited to just one. The password is very ...
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find out unprotected commonly used subdirectories

I try to solve a pentesting challenge where I have to find out a directory, which is unprotected from directory listing. I tried to find it with wfuzz -c -z file,'wordlist.txt' --hc 404 http://...
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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 ...
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dictionary attack hashing algorithm

Does the kind of algorithm used to hash passwords have any advantages or disadvantages in a dictionary attack? i.e. SHA256, MD5, etc. or is it just the dictionary that is used by the attacker matters? ...
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Hydra hangs after attempts or returns all passwords valid

I'm using the Hydra tool on Kali Linux 2020.1 and I'm trying to brute force a login at hack.me http://s123056-104737-qer.sipontum.hack.me/login.php. My problem is that whenever I run Hydra it gets ...
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Pointers for john the ripper rulesets

I've been pouring over the JtR ruleset documentation and making little progress. I understand how to use it to make various permutations from a given wordlist, that's fine. However, I'm trying to ...
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Brute force alphanumeric password using JohnTheRipper

I recently recovered a zip archive with some files I need access to, but I can't remember the password. All I can remember is that the password was short (around 3-4 characters), and contained only ...
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Bruteforcing a Wi-FI password [closed]

Is it possible to brute-force a WiFi password, since technically there are no limits with login attempts? If there is any, the MAC address of the attacker device can be changed.
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How much time is needed for bruteforce kerberos/ntlm? [closed]

How much time does an attacker need for full bruteforce on typical complexity password policy given either: kerberos ticket/ as req or Ntlm transaction This depends on the algorithm used (rc4/aes). ...
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Account lockout for inexistant accounts

I am starting to implement an exponential backoff system to lockout accounts after a certain amount of failed attempts (1min after 5 fails, 2min after 10 fails, etc.). However, as this source suggests,...
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Passphrase vs. password entropy

For a while now I have been interested in the passphrase concept as a potentially more secure replacement for classical passwords. My interest stemmed from a gut feeling that passphrases would be of a ...

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