View source for CoE Cluster november 2011/MD5 attack singlethreaded

=Opgave=
Vi ved en person anvender fire små bogstaver som password, og vi har fået fat i personens [http://manpages.ubuntu.com/manpages/lucid/man1/md5sum.1.html md5sum] hash som er '''420fc26fa13e665e32ca17ea781c645a'''

Hvad er personens password????

=Password generator=
Start programmet med bfpc aaaa og programmet vil skrive aaab start med aaab til aaac ....... zzzz
==Eksempel på anvendelse==
<source lang=cli>
A="aaaa"
while A=`./bfcp $A`
do 
  echo -e "$A"
done
</source>

==bfcp.c source==
<source lang=c>
#include <string.h>
#include <stdio.h>
//bfcp - Brute Force Password Cracker

int main(int argc, char *argv[]) {
        int i,len;
        if (argc != 2) {
                fprintf(stderr,"Argument expected\n");
                return(1);
        }
        len =  (int) strlen(argv[1]);

        for (i=len-1; i >= 0 ; i--) {
                if (argv[1][i] != 'z') {
                        argv[1][i]++;
                        printf("%s\n",argv[1]);
                        return(0);
                } else {
                        argv[1][i]='a';
                }
        }
        //All passwords tryed
        return(1);
}
</source>
=Preparing your script=
#Make your own bin library: '''mkdir ~/bin'''
#Make your own src library: '''mkdir ~/src'''
#Copy and paste the bfcp c source code to ~/src/bfcp.c file
#Compile bfcp '''gcc ~/src/bfcp.c -o ~/bin/bfcp'''
#Make your scriptfile with wour preferred editor. fx. '''vi ~/bin/md5hack'''
=Links=
*[http://haxcess.com/2008/10/21/cisco-password-recovery/ Cisco MD5]
[[Category:CoE]]