1. What is a ‘worm’? What is the significant difference between a ‘worm’ and a ‘virus’? 2. Discuss the concepts of ‘phishing’ and ‘pharming’. 3. Would message integrity on its own ensure that the...

1. What is a ‘worm’? What is the significant difference between a ‘worm’ and a ‘virus’? 2. Discuss the concepts of ‘phishing’ and ‘pharming’. 3. Would message integrity on its own ensure that the contents of a message are not changed during transit? Does something more needs to be done? 4. Write a C program that contains a string (char pointer) with a value ‘Hello World’. The program should XOR each character in this string with 0 and display the result. Repeat the exercise by an XOR operation with 1.