Refer to the following link for this activity (courtesy drdobbs.com):

http://www.drdobbs.com/security/anatomy-of-a-stack-smashing-attack-and-h/240001832?pgno=1

Part I: Read underFootprint of a Stack Overflow Attack

1.Whatis a NOP? What is a NOP sled?

2.What is the difference between payload and shellcode?

3.What is the purpose of the NOP sled in the payload?

4.Whyis the RA repeated?

Part II: Read under Protecting Canaries

5.What is a canary and what is its purpose?