ix.Interception in a MAN environment

Metropolitan Area Networks and Wireless Networks
Metropolitan Area Networks (MANs) and wireless networks are just starting to be implemented in the US – other countries, however, have already expended significant effort in attempts to provide Internet connectivity to their major metropolitan areas. In some models, this effectively makes local government the ISP, while in other models the local government provides the network connectivity while a commercial ISP provides the actual Internet connectivity.

Regardless, this introduces yet another entity who has access to intercept and scrutinize your messages.

x. Interception at Wireless Network Access Point

Wireless network connectivity intuitively seems to provide yet another illicit network access point by allowing interception of the transmitted signals; however, most wireless networking protocols have privacy-enabling technologies built in to their design, and thusly interception of the transmitted signals is not effective. However, traffic may typically be intercepted at the wireless access point (the base station for the antenna) when it is converted to wired networked signals, though this is protocol dependent and the protocol designers are busily at work trying to find a solution for this problem.

Conclusion

There are many places where email messages can be intercepted in transit. This document has attempted to outline only the most pervasive of access points into the overall network, but the Internet is a highly dynamic and rapidly changing physical environment and Internet traffic will, for the foreseeable future, be subject to multiple points of attack in transit. The points of attack have all been illustrated from the standpoint of the message sender, but it is important to note that they all exist on the recipient’s side as well. There is no way to stop people from intercepting your email messages. The only thing you can do to protect the privacy of your messages is to encrypt those messages so that, if intercepted, they cannot be read and will be of no use. This is the nature of the Internet.

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