Exposure
The Internet is a public medium for communication. Although there are core networks that make up the backbone, the majority of the Internet can be considered a cooperative effort of smaller, shared networks. This type of environment poses a serious risk of exposure to any data that is being transmitted in the clear.
Many utilities exist that can assist an attacker in sniffing traffic (a term that refers to the discovery nature of observing raw data as it travels across a network), and many people use these utilities for recreational purposes (much like people use scanners to snoop cellular phone conversations for entertainment).
The best rule of thumb is to consider all data being transmitted to and from your application (the HTTP requests ...
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