Please note that this is only a demo-program, which iterates permutations and prints them on a screen for educational purposes only. It purposely lacks the ability to use random charsets and arbitrary long passwords, which would cause a number overflow. basic demo-bruteforce algorithm in C from m * * compile: g -O3 -pedantic -wall -pipe -o bruteforce bruteforce. Cpp * run:./bruteforce #include math. H #include iostream #include string using namespace std; void bruteforce(const string int main(void) return 0; void bruteforce(const string alphabet) const int min_pw_len 1; const int max_pw_len 3; char pwmax_pw_len 2; int n, pos min_pw_len -1, count0; long double max_perms 0; string final; create last possible. Password length * and alphabet,.
5 characters without numbers (which by the way is a bad idea). A brute-force algorithm would then start with the letter a, b, c, x, y, z, aa, ab, ac, az, ba, bz, aaa, azz, baa, aaaaa, zzzzz. So, brulée somewhere between the single character a and zzzzz the brute-force algorithm will finally find your password, because there is only a finite amount of possible password permutations based on a given alphabet and brute-force algorithms are designed to iterate every passwords permutation. There are various countermeasures to prevent brute-force attacks like: Locking an user account after a few wrong password attempts Increasing the time after each wrong log in attempt Blocking the attackers ip address As long passwords are exponentially more difficult to crack than short ones. Let k be the passwords charset/alphabet and n be the password length, then there are kn permutations for each password length. So how many passwords with exactly 20 alphanums are out there? ( )20 7, lets assume you are able to brute-force one billion password permutations each second, how long would it take to brute-force those 7, permutations? It would take approx.000.000.000 years and this is a long time to wait for a password to be cracked, assuming that the password has exactly 20 alhpanums. The overall number of permutations for a password with charset i and length n can be interpreted as polynomial function: Polynomial Function Example: How many permutations are needed by a brute-force algorithm in the worst case for cracking a password with alphanum charset a-z, a-z. Answer polynomial function:.151.402 permutations so almost one billion permutations need to be analysed by a brute-force algorithm in a worst case scenario for cracking only 5 alphanums due to exponential growth. Brute-force algorithm implemented in C: The following C brute-force algorithm calculates the number of permutations using the polynomial function mentioned above and uses that number as break-condition for its main iteration.
tested for sql-injections by phpbb developers: Again, feel free to use this code and change it to your needs. Dark hackse some of you may have heard of so called brute-force attacks, which hackers use to compromise passwords, web-servers and arbitrary data. Ill explain the basic concepts of brute-force attacks in this article. Typically you need a username and a password to log into a protected area like facebook, twitter, forums or wherever you want to log into: sap gui login Prompt Twitter Login Prompt Windows xp smb login Prompt In most scenarios usernames are public and easy. There are different attack vectors for gaining access to a protected area, some more sophisticated than others, some of them dont even need to guess or decrypt the users password at all. The brute-force attack is, even though not the most sophisticated attack, still an attack with a high success rate, because users choose weak passwords. Brute-force is an algorithm that iterates all possible passwords assuming a certain charset. Lets assume we forgot our routers password, but we remember that it contains max.
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This can be useful for: search engines like, google to analyze web content for their search index analyzing your entire website structure finding certain kind of content on your website, such as all videos, all pdfs, all images or whatever youre looking for. Web developers or, cms -developers, cms-users to find broken links on their websites hackers and pentesters to find http get-parameters on their websites urls that could have sql-injection vulnerabilities. Lets stick to the mask sql-injection vulnerabilities for the sake of subjects like hacking and pentesting on this domain and let us develop a web-Spider that: recursively analyzes a website / domain skips unnecessary content like broken urls, urls to other domains, multimedia content, downloadable files. Stores the entire website structure without its content (as in only the urls the http get parameters and the list of skipped urls to files uniquely stores each n -tuple of variable name and value in http get parameters. I used the programming language python bleken with urllib2 and urlparse for the web-Spider development. Usage:./ your website you can change the source-code to your needs or do whatever you want to do with. Here you go: Lets take this domain as target via and execute the code to see what happens: The program finally creates 3 files: website. Urls: Contains all urls linking so the websites content: website. Skipped: skipped urls like foreign domains website.
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Sometimes you just need a simple backup script so that you can backup and restore your entire operating system. In some situations this is inevitable, like when you choose to glasvezel encrypt your entire existing operating system including your root mountpoint. You might want to backup your plain/unencrypted harddisk, encrypt it and restore its contents to the encrypted mountpoint. Its not advisable to backup a running operating system, unless you know exactly what youre doing. A consistent backup can be created. Backup script: #!/bin/bash typeset dir1:?"usage: 0 backupdir" (id -u) -ne 0 echo "you need to be root" 2 exit 1 -d dir/ echo "dir is not a directory exit 1; dirdir/ echo "Starting (hostname -f s backup at (date)." time tar -exclude/dev -exclude/lostfound -exclude/media -exclude/mnt. ne 0 echo "Unable to compress root directory" exit 1 echo hostname -f s backup ended successfully at (date exit. Backup your linux operating system via:./backup_ mountpoint for backupfile restore: cd your empty root mountpoint tar xzf backupfile. Dark hackse, a web-Spider (or Web-Crawler) is a program that systematically scans the internet or a single website for web content.