Introduction to UNIX-family File Permissions

Learning Tree’s System and Network Security Introduction course begins with a description of the four fundamental concepts of cyber security: authentication, confidentiality, integrity, and availability. That leads into a discussion of authorization: “who is allowed to do what.” The conclusion is the “access equation”: Authentication + Authorization = Access (We also discuss situations where access is […]
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I suggest a permissions contract

A recent post on Lifehacker about using social media logins on other sites got me to thinking: what impact do those permissions social media and smartphone apps really mean anyway? I have always been reluctant to use Facebook’s apps. It seems they want permissions they don’t really need. Why do they need to post on […]
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