Information security is the study and practice of protecting information. Its main goal is to protect the confidentiality, integrity, and availability of information. Professionals usually refer to this as the C-I-A triad, or sometimes the A-I-C triad. (A triad is a group of three things considered to be a single unit.)
The need to protect information is not a new concept. For instance, Julius Caesar used a simple letter-substitution code to share secrets with his military commanders. Caesar used this type of code, called a Caesar cipher ...
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