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CIS 115 Exam 2 Questions and Correct
Answers/ Latest Update / Already Graded
Which of these was NOT a part of the key used to set up an enigma
machine to send and receive messages?
Initial position of rotors
Choice and order of rotors
Orientation of the lights
Plug connections
Ans: Orientation of the lights
The enigma machine was used to send encoded messages during
which war?
The Civil War
The War of the Roses
World War I
World War II
Ans: World War II
The first steps toward cracking the enigma machine were taken by
which Polish mathematician in the 1920s and 1930s?
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Bletchley Park
Alan Turing
Marian Rejewski
Stefan Banach
Ans: Marian Rejewski
In the video, we saw and example of cryptography performed by
wrapping a piece of paper or leather around a dowel rod. What do we
call this device?
Tabula Recta
Polyalphabet
Scytale
Cipher Stick
Ans: Scytale
The cryptoquip puzzle found in the newspaper, where each letter is
replaced with another in a message, is an example of what type of
cipher?
Tabula Recta
Substitution Cipher
Symmetric Key
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Polyalphabetic Cipher
Ans: Substitution Cipher
Match the steps of operating the enigma machine below with the
correct number for each step in order.
Encode Message key twice to avoid errors
Set wheels to message key
Operator chooses message key
Set wheels to today's key from codebook
Encrypt and send message
Ans: Set wheels to today's key from codebook
Operator chooses message key
Encode Message key twice to avoid errors
Set wheels to today's key from codebook
Encrypt and send message
As described in the video, what was the major weakness that allowed
the enigma machine to eventually be cracked?
A letter would never encrypt to itself
Too many options
Poor policies and procedures
All rights reserved © 2025/ 2026 |
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Not enough wheels
Ans: A letter would never encrypt to itself
An enigma machine consists of several circular parts, known by what
term, that contain 26 inputs and outputs and use electrical current
through the complex internal wiring to encode and decode the
message, and increment by one position after each key is pressed?
Keys
Lights
Plugs
Rotors
Ans: Rotors
The Bombe was a device developed to simulate a large number of
enigma machines. It was developed under the supervision of which
computer science pioneer?
Alan Turing
Claude Shannon
Grace Hopper
Margaret Hamilton
Ans: Alan Turing
All rights reserved © 2025/ 2026 |
CIS 115 Exam 2 Questions and Correct
Answers/ Latest Update / Already Graded
Which of these was NOT a part of the key used to set up an enigma
machine to send and receive messages?
Initial position of rotors
Choice and order of rotors
Orientation of the lights
Plug connections
Ans: Orientation of the lights
The enigma machine was used to send encoded messages during
which war?
The Civil War
The War of the Roses
World War I
World War II
Ans: World War II
The first steps toward cracking the enigma machine were taken by
which Polish mathematician in the 1920s and 1930s?
All rights reserved © 2025/ 2026 |
, Page |2
Bletchley Park
Alan Turing
Marian Rejewski
Stefan Banach
Ans: Marian Rejewski
In the video, we saw and example of cryptography performed by
wrapping a piece of paper or leather around a dowel rod. What do we
call this device?
Tabula Recta
Polyalphabet
Scytale
Cipher Stick
Ans: Scytale
The cryptoquip puzzle found in the newspaper, where each letter is
replaced with another in a message, is an example of what type of
cipher?
Tabula Recta
Substitution Cipher
Symmetric Key
All rights reserved © 2025/ 2026 |
, Page |3
Polyalphabetic Cipher
Ans: Substitution Cipher
Match the steps of operating the enigma machine below with the
correct number for each step in order.
Encode Message key twice to avoid errors
Set wheels to message key
Operator chooses message key
Set wheels to today's key from codebook
Encrypt and send message
Ans: Set wheels to today's key from codebook
Operator chooses message key
Encode Message key twice to avoid errors
Set wheels to today's key from codebook
Encrypt and send message
As described in the video, what was the major weakness that allowed
the enigma machine to eventually be cracked?
A letter would never encrypt to itself
Too many options
Poor policies and procedures
All rights reserved © 2025/ 2026 |
, Page |4
Not enough wheels
Ans: A letter would never encrypt to itself
An enigma machine consists of several circular parts, known by what
term, that contain 26 inputs and outputs and use electrical current
through the complex internal wiring to encode and decode the
message, and increment by one position after each key is pressed?
Keys
Lights
Plugs
Rotors
Ans: Rotors
The Bombe was a device developed to simulate a large number of
enigma machines. It was developed under the supervision of which
computer science pioneer?
Alan Turing
Claude Shannon
Grace Hopper
Margaret Hamilton
Ans: Alan Turing
All rights reserved © 2025/ 2026 |
