Special Edition Using TCP/IP, Second Edition

Introduction to IP Security

You use a variety of communication media to transfer information to another person. Today, you can use e-mail, pagers, or the postal system to communicate information. However, the simplest form of communication that still exists is direct talk between two people. In this form of communication, air is the communicating medium. If you need to communicate sensitive information, you may be concerned that others might overhear the information that you are passing on to another person. Therefore, you might try to reduce the chances of information leaks by talking in hushed tones as a “security” measure. Although the reach of the Internet as a communication medium cannot be compared with air, widespread implementation ...