Theory of Intelligence
11TH•Mathematics•Complex Numbers•Question 20

Solution

Encrypt the word "CODE" by multiplying the complex encryption key $k=2-i$. Then decrypt it back to the original word.

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Solution

Use the mapping A=1,…,Z=26A=1,\dots,Z=26.

Word: CODE

C=3, O=15, D=4, E=5C=3,\ O=15,\ D=4,\ E=5

Encryption key:

k=2−ik=2-i

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