From the course: CompTIA Security+ (SY0-601) Cert Prep: 3 Cryptography Design and Implementation

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Cryptographic math

Cryptographic math

From the course: CompTIA Security+ (SY0-601) Cert Prep: 3 Cryptography Design and Implementation

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Cryptographic math

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- [Narrator] Math plays a central role in cryptography. You won't find complex mathematical questions on the exam, but you should be familiar with some of the basic terms and concepts that support cryptography. First many cryptographic algorithms use the Exclusive Or operation to combine plain text and cipher text with cryptographic keys. The Exclusive Or operation, which is often abbreviated X-O-R or XOR, is a logical operation that is true when one and only one of the inputs is true. Let's take a look at the truth table for the XOR operation. Here. We have two variables, X and Y, and then the Exclusive Or of those two variables, which is represented by the symbol that you see here on the screen, a plus with a circle around it. If we have two inputs, X and Y, and they're both false, then neither one of those is true and X Exclusive Or Y is false. If X is true and Y is false then exactly one of the inputs is true and X Exclusive…

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