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Lecture 18 HACKING (CONTINUED) WHY DO PEOPLE HACK ? JUST FOR FUN. SHOW OF THEIR KNOWLEDGE. HACK OTHER SYSTEM SECRETLY. DESTROY ENEMY’S COMPUTER NETWORK DURING THE WAR. FOR PROFIT PEOPLE PAYS A CRACKER. CRACK FOR SAKE OF CURIOCITY. THE PSYCOLOGY OF HACKERS ALL INFORMATION SHOULD BE FREE. ACCESS TO COMPUTER SHOULD BE UNLIMITED AND FREE. IT CAN CHANGE LIFE FOR BETTER. IT CAN CREATE BEAUTY ON COMPUTER. TYPES OF HACKING THERE ARE MANY TYPES OF HACKING LIKE • PASSWORD HACKING • SOFTWARE HACKING • NET HACKING PASSWORD HACKING  TWO TYPES 1. BRUTE FORCE • IN THAT CASE HACKERS TRY OUT ALL THE COMBINATION OF ALL KEYBOARD LETTERS .IT HAS GRATER SUCCESS BUT IT TAKES LONG TIME 2. DICTIONARY BASED • IN THAT THEY ARE USE PREDEFINE PASSWORD.IT IS UNSUCCESSFUL METHOD SOFTWARE HACKING IN THAT HACKERS CHANGES THE LOOK & EXCUTION WAY OF THAT SOFTWARE  CHANG THE DEMO VERSION INTO FULL VERSION BY DECODING THE SOURCE CODE IP ADDRESS IP ADDRESS IS THE ADDRESS OF YOUR COMPUTER IN THE INTERNET IT IS UNIQ LIKE 192.168.23.45 PORT  IT IS NOT PHYSICAL PORT BUT IT IS LOGICAL PORT IN YOUR COMPUTER  IT IS JUST LIKE HOLE ONTO THE SYSTEM.THROUGH HACKER CAN ENTER  THERE ARE THOUSANDS OF PORTS INTO COMPUTER  THE PETICULAR SERVICE IS RUNNING ON PERTICULAR PORT  LIKE PORT 21 : FTP PORT 23 : TELNET PORT 80 : HTTP PORT 25 : MAIL HACKING TOOLS THERE ARE MANY TOOLS ARE AVILABLE • SCANNERS • TELNET • FTP • LAN WATCH SCANNERS  IT IS NOT A PHOTO SCANNER  SCANNER IS PROGRAM THAT AUTOMATICALLY DETECTS SECURITY WEAKNESS IN REMOTE HOST  PORT SCANNERS ARE USED IN HACKING  PORT SCANNER CAN GIVE THE WHOLE LIST OF OPEN PORT ON THAT SYSTEM AND WHICH SERVICE IS RUNNING ON THAT  IT CAN USE ALMOST ALL OPERATING SYSTEM  EX. SATAN,NMAP