Lesson 2: Secure wireless networks

- [Narrator] Our second lesson…comes from the second way…that attackers gained access to the TJX network:…through TJX's wireless network.…As we now know, the company used…the Wired Equivalent Privacy standard…to secure its wireless network.…Wi-Fi is a huge convenience for users,…but it also introduces security concerns…that don't exist on wired networks.…When I'm plugged into a network jack in the wall,…eavesdropping on that connection…requires physically tapping the cable…or compromising a network device.…

Wi-Fi uses radio signals that anyone can pluck…out of the air with some very basic equipment…and an antenna.…This makes encryption critical…for protecting the security of wireless networks.…Encryption hides the true content of network traffic…from those without the decryption key.…It takes an insecure communications technology,…radio waves, and makes it secure.…You have four options when it comes to wireless encryption.…Two of them are bad.…

The first of those is using no encryption at all…and sending messages in the clear, open to anyone.…