1.4.7. Transaction Propagation

A web application is a collection of servlets, HTML pages, classes, and other resources that make up acomplete application on a web server

If theunpacked digest doesn't match node B's own version of the digest, either the message wastampered with in-flight, or the sender did not have node A's private key (and therefore wasnot node A).

the checksum would no longer match.

use public-keycryptography to conveniently set up secure communication between nodes but then to use that securechannel to generate and communicate a temporary, random symmetric key to encrypt the rest of thedata through faster, symmetric cryptography.

no one other than X can decodethe messages, because only X has the decoding private key dx .

Because each host is assigned an encoding key,which everyone uses, public-key cryptography avoids the N2 explosion of pairwise symmetric keys(see Figure 14-9).

web clients andservers don't need to change much of their protocol processing logic to use secure HTTP.

JSP overcomes almost all the problems of Servlet. It provides better separation of concern, now presentation and business logic can be easily separated.

You don't need to redeploy the application if JSP page is modified.

The controller module acts as an interface between view and model. It intercepts all the requests i.e. receives input and commands to Model / View to change accordingly.

If theprevious use of inheritance was visible to clients, then thisreimplementation may require changes to the clients.

Thus, the freedom of the designer tochange the implementation of a class is reduced.