This is a great story of how students hacked the bells and display system in their school division, replacing the usual messages with a rickroll. The article tells us almost everything (it keeps some of the exploits under wraps) including even some of the code. The author was also at great pains to show how they were careful to avoid any disruption or damage, and how they documented every step and (eventually) worked with administrators to secure the system. There are many great lessons in this post and it should be shared widely with computing science teachers and enthusiastic student programmers. Via Twit.
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