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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56 views

How does the following brute force password breaker work?

def numberToBase(n, b): """ This function will convert the number n into base b and return a list containing the digits of number n in base b """ digits = [] while n > 0: ...
0
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1answer
57 views

Retrieve password of an encrypted hard drive [on hold]

I have a hard drive that uses hardware encryption. After not using it for a while, I have forgotten a code which is needed to reset the drive, but doesn't give access to any data. The window for this ...
0
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2answers
47 views

How would I brute-force a Bitlocker recovery key?

I have imaged a hard disk and used passware, but to no avail - it says Encryption key External key, and not the actual key. How do you think I would go about brute forcing it? Lets assume I had ...
1
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3answers
181 views

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 ...
1
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1answer
19 views

How can SHA256-hashes as input to MD5 be revealed?

I know that you shouldn't use unsalted MD5 hashes of passwords in databases. But unfortunately, people do, see https://hashes.org/public.php. From this site I downloaded a file with passwords which ...
1
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0answers
53 views

RSA-1024 vs. DSA-1024: Claim DSA SSH key is much faster to brute force

Does the brute force speed vary significantly between 1024-bit RSA and DSA SSH keys? DSA like gpu keypairs are probably DSA/Elgamal? (Can't find docs) EDIT: The reason I ask is an instructor that "...
1
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1answer
55 views

Can I use John the Ripper to brute-force a password-protected flash drive?

I have a password-protected flash drive. The input window allows unlimited password attempts, but this form is not an encrypted file. Can I use John the Ripper to bruteforce the password?
14
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1answer
2k views

Understanding brute-forcing algorithms [duplicate]

I've been reading up on brute-forcing techniques and possible methods of prevention, but there is one issue that I haven't been able to find a clear answer to. The way I understand it, a 'simple' ...
4
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8answers
816 views

Does it take longer to brute force a password starting with z than one starting with a?

I was wondering about the following: If someone tries to get my password with Brute Force, will a password starting with "a" guessed faster than one starting with "z" ? In this case assume the ...
4
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3answers
1k views

Calculate time taken to break AES key

A 256 bit AES key is required to be broken using the brute force method on a 2GHz computer. How long would it take to break the key in the best case and in the worst case situations? Assume that 1000 ...
1
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0answers
39 views

Password guessing attack on file from SSD [closed]

I got the following scenario: a SSD self-encrypting drive (to be precise: a Samsung MZ7PD256HCGM) is encrypted using McAfee full-drive encryption (Opal 2.0 standard). I have a (relatively small) file ...
1
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0answers
38 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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1answer
210 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 ...
0
votes
1answer
80 views

Robots trying to login to Azure VM when SSH port is closed in manager

I have many robots trying to do SSH login in a Azure VM. In the resource manager SSH is disabled but attacker IPs are public, as you can see below, where I copy a log for auth.log (I have an Ubuntu ...
34
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7answers
4k views

How to know if a file is decrypted or not

For school, I have to do an exercise in which I have to decrypt files by brute force attack. There are a lot of different files in different file formats. The files have been encrypted using XOR or ...
0
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1answer
32 views

Attacking encrypted storage vs attacking memory [duplicate]

I want to create a generative password manager. Generative password managers generate passwords based on seeds such as the master password and the website's URL. In contrast, most password managers ...
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votes
1answer
122 views

Brute forcing using hydra

I'm try to do brute force attack on a system and I have complete word list of the possible passwords because they use a really simple format but when I tried hydra with the following post responses, ...
1
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1answer
58 views

Can LastPass local password store (on a Android device) be brute forced in a usual way?

I' trying to figure out how secure LastPass is if you have it on your Android device and it gets stolen. If I'm not mistaken there has to be a password vault stored somewhere locally on the device. ...
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votes
1answer
83 views

How long does it take to brute force a 7 character long password taken from 16 character set

A database file is encrypted with 256bits AES and the key is the first 7 characters (from the character set 0-9, a - f, all small letter) of MD5 hash . This implies 2^28 bits (268,435,456) possible ...
6
votes
2answers
262 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 ...
5
votes
3answers
808 views

How can I restrict users' connection attempts to my FTP server?

Is there any way possible to restrict user to make a connection to the FTP server on my Windows XP computer? I have an FTP server established in Windows XP and now I want to make access to that FTP ...
3
votes
1answer
58 views

Is there value in slowing down retries on a fingerprint lock?

My phone has a fingerprint lock and it sometimes fails to identify my fingerprint (for example, if it wasn't positioned correctly). If I fail fingerprint identification 5 times in a row, I'm locked ...
36
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7answers
7k views

Is it possible to improve brute-force guessing of a password with a picture of the keyboard used to enter it?

Is it a bad idea to post a photo of your keyboard to social media? Can I look at a photo of a keyboard and determine the password of an account? Assuming a certain (set of) password(s) is the most ...
6
votes
1answer
109 views

Hydra when redirects

I'm using Hydra and I have trouble with this command: hydra 123.123.123.123 http-form-post \ "/se/login:j_username^USER^&j_password=^PASS^&submit=Log+in:/se/invalidLogin" \ -L /root/...
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votes
1answer
84 views

Time to break SHA-512 [closed]

From http://stackoverflow.com/questions/6776050/how-long-to-brute-force-a-salted-sha-512-hash-salt-provided, to break SHA-512 with brute force strategy, it require 3,17 * 10^64 years. It is almost ...
0
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0answers
38 views

Tool/Python script to generate word list [duplicate]

Is there a tool or specific Python script to performs the following to generate a word list: able to set minimum amount of letters such as 8 able to set maximum amount of letters such as 15 use ...
42
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4answers
32k views

Are salted SHA-256/512 hashes still safe if the hashes and their salts are exposed?

Scenario: a database of hashed and and salted passwords, including salts for each password, is stolen by a malicious user. Passwords are 6-10 chars long and chosen by non-technical users. Can this ...
1
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0answers
53 views

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 ...
35
votes
8answers
4k views

Find matching phone numbers without actually knowing them

We have a mobile app that, given two users, needs to let them see what common contacts they have based on their phone numbers. How can we do this in a cryptographically secure way and respecting the ...
1
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0answers
34 views

DVWA hydra brute not matching

I am trying to brute force DVWA on low security. I disabled the first authentification as well. However when I ran my hydra script it doesn't match it with correct password. Here is my query hydra -l ...
4
votes
1answer
105 views

Spoofing an NTP server to allow bruteforce on any smartphone

We all know that smartphones (i'll take iPhone as an example) rely on SNTP/NTP servers to update a device's time and date. So, by creating an SNTP server that mimics Apple's server, we can actually ...
3
votes
3answers
116 views

Are login pages with no retry counts/lockouts a security risk?

I found a login page for a city/edu organisation that has no session times, no retry counter/lockout, and no delays if too many tries are made in a certain timeframe. I am able to exploit this to get ...
2
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2answers
184 views

Can You Brute Force Dropbox Folder URLs?

One can share folders with Dropbox by sending a URL with a hash in it. A recent article reported that user files were accessed by generating urls from common URL shortners. These URLs are typically ...
3
votes
1answer
617 views

Cracking a 6-character alphanumeric password Windows dialog box

To put this problem in context, I have a touch monitor screen whose firmware program is protected by a password. The firmware program is downloaded over RS232 via a Windows utility program provided ...
3
votes
1answer
93 views

Two factor brute force protection

If I implement two factor authentication using TOTP, I (obviously) have to protect against simple brute force attacks of the TOTP value. If I ask for the TOTP value after successful password login, ...
5
votes
2answers
651 views

How much faster does a GPU or FPGA crack an RSA key compared to a CPU?

Are there any significant speed up in time on cracking an RSA key (either brute-force or factoring with general number field sieve) using a GPA or FPGA compared to a CPU? If there is a speed advantage,...
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3answers
294 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 ...
5
votes
2answers
7k views

Faster methods for decrypting a TrueCrypt disk, esp. knowing the algorithms used

I encrypted (with TrueCrypt) all my hard drives and had the passwords stored in an encrypted file on my USB disk. The passwords are all (except one) 50 character randomly-generated ciphers, there's no ...
3
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2answers
94 views

What scenario are 'extra' strong passwords and hashing algorithms actually protecting against?

Note: I completely understand the need for strong passwords & I understand that there is an issue of speed with hashing. I am just interested in better understanding the actual negative impact of ...
2
votes
1answer
267 views

How does attacker Brute force facebook account if there is a limit for tries? [closed]

I am wondering how does a user use Kali with python Brute Force Algorithm to brute force accounts like a facebook account when there are security measure in place like:Pause your try after 3 ...
0
votes
0answers
23 views

Cyrus-Imap (v2.3.16) local logon attack

CentOS-6.7 Cyrus-IMAP-2.3.16 The host inet07.hamilton.harte-lyne.ca is our IMAP server host. It offers imap and pop3 publicly. I uses local accounts (/etc/passwd) for imap/pop3 authentication only....
1
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2answers
115 views

How can we protect signup APIs from brute force registration?

This is a general question but its prompted by a fairly open API I have for a file storage service that needs to have its front door better locked down. We have an API like POST '/signup' that just ...
46
votes
4answers
67k views

How to estimate the time needed to crack RSA encryption?

How to estimate the time needed to crack RSA encryption? I mean the time needed to crack Rsa encryption with key length of 1024, 2048, 3072, 4096, 5120, 6144, 5120, 7168, 8192, 9216, 10240, 11264, ...
46
votes
7answers
9k views

How are GPUs used in brute force attacks?

I have read that GPUs can be used in brute force attacks? But how can this be done and is there a need for any other hardware devices (hard disks for instance)? Note: I'm more interested in web ...
1
vote
1answer
84 views

VPN - Why is my NAT'ed Laptop being SSH-brute-forced by External IPs when in VPN?

I am using a commercial paid licence to a VPN provider, which I use on two boxes, a FreeBSD, and a Linux BackBox. When connected to this proxy, my interface receives a public IP from the VPN ...
2
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2answers
142 views

How fast is it to bruteforce a 48-bit key with current technology?

Say you have a truly random hexadecimal key formatted as 1234.5678.ABCD, with 48-bit entropy. Assuming the key is stored with no hashing/salting, how fast/easy would it be to brute force it with ...
4
votes
1answer
42 views

What are the dangers of exposing weakly protected user accounts bound with a fake shell over ssh?

As anyone running a server can tell from first-hand experience, there are bots trying to constantly brute force their way through with commonly found usernames over SSH. A friend of mine created a ...
0
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2answers
295 views

Cracking a password Protected pdf file using John the ripper

What exactly happens after I provide the hash from the pdf file to John for cracking the password? Does John extract just the password hash from the file and work on it, or is there something else?
27
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3answers
4k views

Use multiple computers for faster brute force [duplicate]

I've watched Mr. Robot lately and can't stop thinking why it was so hard to decrypt files encrypted using AES encryption with a 256-bit key. Let us say the only method to find the key is through brute ...