Читать книгу Information Security - Mark Stamp - Страница 14

Following tradition, Alice and Bob, are the good guys. Alice and Bob, who are pictured in Figure 1.1 (a) and (b), respectively, generally try to do the right thing. Occasionally, we'll require an additional good guy or two, such as Charlie or Dave. A recurring theme of this book is that stick people often make dumb mistakes, just like real people.

Figure 1.1 The main actors

Trudy, pictured in Figure 1.1 (c), is our generic bad guy who is trying to attack the system in some way. Some authors employ a team of bad guys where the name implies the particular nefarious activity. In such usage, Trudy is an “intruder,” Eve is an “eavesdropper,” and so on. To simplify things, we'll let Trudy be our all‐purpose bad guy, although Eve might make a brief cameo appearance. Just like the bad guys in classic Hollywood Westerns, our bad guys always wear a black hat.

Alice, Bob, Trudy, and the rest of the gang need not be humans. For example, one of many possible permutations would have Alice as a laptop, Bob a server, and Trudy a human.