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WorksheetsCryptography
Total questions: 35
Worksheet time: 15mins
Who was the first know user of the Caesar Cipher?
Caesar Romanus
Julius Caesar
Alan Turing
There isn't one
What was the name of the man who led the team that cracked the German's "Enigma Code" in WW2?
Tim Berners-Lee
Alan Turing
Stephen Hawking
Bill Gates
Which one of the following statements is FALSE?
Cracking the Enigma Code shortened WW2 by at least two years and saved millions of lives
Alan Turing was the first person to come up with the idea of a programmable machine
Alan Turing was one of the pioneers of modern computing
Polish mathematicians were the first ones to crack the Enigma Code
In Cryptography, original message, before being transformed, is called
Simple Text
Plain Text
Cipher Text
Filled Text
An encryption algorithm transforms plain text into:
Cipher text
Simple Text
Empty Text
Plain Text
_______ is the science and art of transforming messages to make them secure and immune to attacks.
Cryptography
Cryptoanalysis
neither Cryptography nor Cryptoanalysis
either Cryptography or Cryptoanalysis
A(n) ______ algorithm transforms cipher text to plain text.
Encryption
Decryption
The _______ is a number or a set of numbers on which the cipher operates.
secret
cipher
key
none of the mentioned
The art and science of breaking the cipher text is known as
Cryptanalysis
Cryptography
Staganography
Watermarking
A method for determining a solution to a problem by sequentially testing all possible solutions.
brute force
relative frequency
cipher
paired keys
A cipher is _________________________.
a person who makes up secret codes
an algorithm that is used to scramble text so that it can be passed in secret
a lock that can be used to lock a message in a lock box
any puzzle, such as a crossword or Sudoku puzzle
The process of converting a ciphertext into plaintext.
encryption
decryption
plaintext
cryptography
What is the name of the electro-mechanical device used by British cryptologists to help decipher German Enigma-machine-encrypted secret messages during WWII?
Bomba
Bomby
Bombe
Bomb
When a single plaintext letter is encoded by a single ciphertext letter repeated throughout the sentence it is a:
Monoalphabetic Cipher
Polyalphabetic Cipher
Cipher based on substitution, using multiple substitution alphabets is called:
Polyalphabetic cipher
Monoalphabetic cipher
Polycipher
Monocipher
Tick all examples of Monoaplhabetic Ciphers:
Caesar Cipher
Vigenere Cipher
Keypad Cipher
Morse Code Cipher
Study of letters or groups of letters contained in a ciphertext in an attempt to partially reveal the message is called:
Frequency analysis
Cryptography
Encription
Decription
In Cryptography the character sequence that you believe you know is called:
crib
key
guess
plaintext
In Cryptography, original message, before being transformed, is called
Simple Text
Plain Text
Cipher Text
Filled Text
An encryption algorithm transforms plain text into:
Cipher text
Simple Text
Empty Text
Plain Text
The process of converting a ciphertext into plaintext.
encryption
decryption
plaintext
cryptography
Which country do hieroglyphics come from?
Greece
Spain
South Africa
Egypt
What does the word cryptography mean?
The art of cooking or baking secret codes
The art of writing or solving secret codes
The art of drawing or painting secret codes
The art of throwing or catching secret codes
Who invented the Enigma Cipher Machine?
The Americans
The British
The Germans
The Mexicans
Can you break this code?
Orange = 10
Orange = 6
Orange = 5
Orange = 2
What is the problem with the following plain text to encrypt with a Caesar Cipher?
Is your birthday 9/30/1998?
Numbers cannot be encrypted
It would be relatively easy to decipher after encryption
Symbols cannot be encrypted
all of the above
Consider the process of encoding and decoding a message using the following Caesar cipher encoding scheme in which the plaintext and ciphertext alphabets are offset by four positions, as shown below:
Plaintext: a b c d e f g h i j k l m n o p q r s t u v w x y z
Ciphertext: w x y z a b c d e f g h i j k l m n o p q r s t u v
Which of the following encoded ciphertext strings decodes to an original plaintext message of "secret"?
etsecr
wigvix
kwujwl
oaynap
What is the algorithm of ceasar's cipher?
Each letter is replaced with a particular symbol
Each letter is replaced with a letter a certain number of steps down the alphabet
Each letter is replaced with a particular number from 0 to 26, and numbers are replaced with letters.
What is the meaning of Greek words "crypt" or "cryph"
hidden
scary
away
off
What symbols does the Morse Code cipher use?
Simple Alphabet
Dots and dashes
Squares and triangles
Numbers
