If your webbots are going to access sensitive information or handle money, they'll need to authenticate, or sign in as registered users of websites. This chapter teaches you how to write webbots that access password-protected websites. As in previous chapters, you can practice what you learn with example scripts and special test pages on the book's website.
Authentication is the processes of proving that you are who you say you are. You authenticate yourself by presenting something that only you can produce. Table 21-1 describes the three categories of things used to prove a person's identity.
Table 21-1. Things That Prove a Person's Identity
You Authenticate Yourself With . . .
Something you ...