A/AS Level Computer Science for WJEC/Eduqas Component 1 Cambridge Elevate Enhanced Edition (2 Years)

Page 59

transmitted as 011110112. To recover the original data, the recipient with XOR the cypher text with the key. 011110112

Key

110100012 XOR

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Cyphertext

Chapter summary

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Original Data 101010102

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Conjunction: both sides of the proposition must be true. Disjunction: either side of the proposition can be true. Negation: reverses the truth of a proposition.

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Implication: if something is true then we can infer that something else is also true.

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Commutation: the order does not matter when using conjunction or disjunction.

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Association: the order does not matter when we link multiple conjunctions or multiple disjunctions; this does not hold true if we start mixing conjunctions and disjunctions. Double negation: two negations cancel each other out. de Morgan’s law: the negation of disjunctions is the conjunction of the negations.

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A/AS Level Computer Science for WJEC/Eduqas Component 1 Cambridge Elevate Enhanced Edition (2 Years) by Cambridge International Education - Issuu