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CompTIA® Security+™: Study Guide, Fifth Edition by Emmett Dulaney

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An Overview of Cryptography

Cryptography is a field almost as old as humankind. The first recorded cryptographic efforts occurred 4,000 years ago. These early efforts included translating messages from one language into another or substituting characters. Since that time, cryptography has grown to include a plethora of possibilities.

note.eps

You won’t be tested on the history of cryptography in the Security+ exam; this information is included primarily for background purposes.

The following sections briefly discuss three categories of cryptography—physical, mathematical, and quantum—as well as code breaking. Quantum cryptography is extremely classified ...

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