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It is much longer than 13 characters, and the legal characters include punctuation and other characters v Exportable It was not developed in part by the US government, so it can be exported outside the United States
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The following Perl script illustrates an implementation of MD5:
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#!/usr/bin/perl w # md5pl
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use strict; use MD5; print 'Please enter your password: '; my $passwd = <STDIN>; chomp $passwd; my $md5 = new MD5; $md5->add($passwd); my $digest = $md5->digest(); print("Result is ", unpack("H*", $digest), "\n");
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Here is an example of executing this program:
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[jdoe@machine1 perl]$ /md5pl Please enter your password: IamGod Result is d8c653b74da4841b95b17d38a68f20cb
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It is extremely unlikely, but possible, for two different passwords to generate the same encrypted text for MD5
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PASSWORD CRACKING PROGRAMS
Password cracking describes the act of guessing passwords in an attempt to gain access to a computer Most password cracking strategies involve selecting common words from a dictionary (called a dictionary attack) or common patterns used (such as testing123) The steps hackers will take to try to crack passwords usually involve obtaining a copy of /etc/passwd and then executing a program remotely on their machine that guesses passwords, in an attempt to produce the encrypted form of the password stored in that file The brute force method involves repeated attempts to log in The hacker will use a username (like root) and begin the brute force attempt at guessing the password perhaps starting with aaaaaa, then aaaaab, then aaaaac, and so on This type of attack does not require a copy of the encrypted passwords merely a lot of patience and sufficient time However, it is easy to see evidence of such an attack because this method will leave trails in the system log files And you do check your logs, don t you Here is an example of the Linux log file /var/log/messages showing evidence of a brute force attack:
Nov 6 15:49:27 machine1 login[1699]: FAILED LOGIN 1 FROM localhost FOR root, Authentication failure Nov 6 15:49:32 machine1 login[1699]: FAILED LOGIN 2 FROM localhost FOR root, Authentication failure Nov 6 15:49:37 machine1 login[1699]: FAILED LOGIN 3 FROM localhost FOR root,
Hacking Linux Exposed: Linux Security Secrets & Solutions
Authentication failure Nov 6 15:49:41 machine1 login[1699]: FAILED LOGIN SESSION FROM localhost FOR root, Authentication failure Nov 6 15:49:41 machine1 PAM_pwdb[1699]: 3 more authentication failures; (uid=0) -> root for login service Nov 6 15:49:41 machine1 PAM_pwdb[1699]: service(login) ignoring max retries; 4 > 3
Performing a dictionary attack or a brute force attack by hand is tedious and time consuming However, most hackers will not perform these attacks by hand; instead, they will use one of the available open source password cracking programs We will look at two popular ones: Crack and John the Ripper
MCrack
Popularity: Simplicity: Impact: Risk Rating:
10 9 9 9
Crack is one of the best known UNIX password cracking programs You could call it the father of all password crackers It is considered the standard by which other password cracking programs are measured It was written by Alec D E Muffet, a UNIX engineer from Wales In Alec s words: Crack is a freely available program designed to find standard UNIX eight-character DES encrypted passwords by standard guessing techniques It is written to be flexible, configurable, and fast
Installing Crack
The following example was performed on an installation of RedHat Linux version 62 Most Linux distributions will follow similar installation steps First, download the latest version (currently 50a) from
http://wwwusersdirconcouk/~crypto/indexhtml
Next, unzip and untar the tarball:
[jdoe@machine1 /tmp]# tar xzf crack50targz
Change directory into the new directory named c50a:
[jdoe@machine1 /tmp]# cd c50a
The next step is to compile Crack If an MD5-based version of crypt() is being used (which is the case with Red Hat 62), it is necessary to do the following:
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