Encryption Has a Remarkably Long and Varied History

question 30

Multiple Choice

Encryption has a remarkably long and varied history.Spies have been using it to convey secret messages ever since there were secret messages to convey.One powerful method of encryption uses random digits.Two documents are prepared with the same random sequence of numbers.The spy is sent out with one and the spy master retains the other.The digits are used as follows.Suppose that the word to be encrypted is SPY and the random digits are 352.Then S becomes V (three letters after S) ,P becomes U (five letters after P) ,and Y becomes A (two letters after Y,restarting at A after Z) .The spy would encrypt a message and then destroy the document used to encrypt it.This is an early example of

• A)a hashing algorithm.
• B)asymmetric key encryption.
• C)symmetric key encryption.
• D)public key encryption.

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Definitions:

Diffusion Of Innovation

A theory that seeks to explain how, why, and at what rate new ideas and technology spread through cultures.

Late Majority

A group of adopters who are slower than the average participant to embrace new ideas, technologies, or products.

Innovators

Individuals or organizations that introduce new ideas, products, or methods into the market.

Early Majority

A group of consumers who adopt new products or innovations shortly after the early adopters have done so, contributing to wider acceptance and popularity.