presented by:
vamsi

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INTRODUCTION
 It is an intellectual activity
 It is a sort of mental gymnasium
 It can also used for criminal activities
 Ethical hacking is one of remedy to prevent the criminal hacking
HACKER Vs CRACKER
 Hacker - a computer freak who peeps into others computers
- computer experts who knew everything about the way of software works
-they debug code and use trail and error methods to discover new tricks and secrets

 There is a thin line between hackers and cracker
 Cracker - nerd persons with an intention of harming others computers
- besides unauthorized entry they try to destroy others resources
TECHNIQUES:
 Cookie based technique
 SQL Injection technique
 Object based technique
COOKIE BASED
 Cookies are bits of data that a browser stores in your visitor's computer
 They are stored in file named ‘temp’
 They allow us to store data, specific to a particular user or a particular site
 Java script is the popular method in cookie based technique
Example:
 This is a simple java script to hack any web site
‘javascript: document.body.contentEditable = 'true';document.designMode = 'on'; void 0’
 By placing this JavaScript code in the address bar of your web browser and hit enter, it will become editable just as a notepad
 It is shown below
Before:
After:
SQL INJECTION
 SQL Injection involves entering SQL code into web forms
 This method mainly used in breaking password of any web application
 It works directly on database
 There are many SQL queries to break the password
Example:
 Following are some of the SQL codes used to break passwords
x‘ or 'a' = ‘a (or) 1=1—
 SELECT * FROM users WHERE username = 'admin' and PASSWORD = 'x' or 'a' = 'a‘
 Above SQL command is the full form of SQL code
 The above commands are placed in the password field to break
OBJECT BASED
 Objects are created to hack the data from ones system
 They are classes written in the Java programming language
 They are used to encapsulate many objects into a single object (the bean)
 they can be passed around as a single bean object instead of as multiple individual objects