C839 Knowledge Check Questions Only (Sample Questions from Chapters 1 6)/ WGU C839 Introduction to Cryptography Practice Quiz

C839 Knowledge Check
Questions Only (Sample
Questions from Chapters 1-
6)/ WGU C839 Introduction
to Cryptography Practice
Quiz
C839 Pre-Assessment Prep

, Chapter 1 Context of Cryptography

▪ Define cryptography.
▪ Describe monoalphabetic substitution.
▪ Describe Scytale.
▪ Summarize single substitution weaknesses.
▪ Describe the cipher disk.
▪ Perform manual encryption and decryption with a simple substitution
cipher.
▪ Explain the Vigenère and Playfair ciphers.
▪ Describe twentieth-century polyalphabetic substitution ciphers.
▪ Describe frequency analysis.
▪ Describe the Kasiski examination.


1. Which mono-alphabet cipher’s operation entails simply reversing the alphabet? i.e. the letter A
becomes the letter Z, B becomes Y.

A. Caesar

B. Vigenere

C. Atbash

D. Playfair



2. Which mono-alphabet cipher makes use of a rod of a certain length to encrypt a message and
requires the message recipient to use a rod of the same dimensions to decrypt the same message?

A. Cipher disk

B. ADFGVX

C. ROT-13

D. Scytale



3. Which polyalphabetic cipher system invented in 1553 performs encryption operations using a series
of interwoven Caesar ciphers based on the letters of a keyword?

A. Vigenere




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