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- 1. Multiple Choice
Who was the first know user of the Caesar Cipher?
Caesar Romanus
Julius Caesar
Alan Turing
There isn't one
- 2. Multiple ChoiceWhat machine was used during WWII to encrypt and decrypt German messages?EnigmaAtbashSecretPuzzler
- 3. Multiple Choice
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
- 4. Multiple Choice
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
- 5. Multiple Choice
In Cryptography, original message, before being transformed, is called
Simple Text
Plain Text
Cipher Text
Filled Text
- 6. Multiple Choice
An encryption algorithm transforms plain text into:
Cipher text
Simple Text
Empty Text
Plain Text
- 7. Multiple Choice
_______ 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
- 8. Multiple Choice
A(n) ______ algorithm transforms cipher text to plain text.
Encryption
Decryption
- 9. Multiple Choice
The _______ is a number or a set of numbers on which the cipher operates.
secret
cipher
key
none of the mentioned
- 10. Multiple Choice
A method for determining a solution to a problem by sequentially testing all possible solutions.
brute force
relative frequency
cipher
paired keys
- 11. Multiple ChoiceWhat is encryption?When you put data / text into code making it difficult to read or understand.A secret or disguised way of writing; a code.A formal language designed to communicate instructions to a machineWhat is put in, taken in, or operated on by any process or system.
- 12. Multiple Choice
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
- 13. Multiple Choice
The process of converting a ciphertext into plaintext.
encryption
decryption
plaintext
cryptography
- 14. Multiple Choice
When a single plaintext letter is encoded by a single ciphertext letter repeated throughout the sentence it is a:
Monoalphabetic Cipher
Polyalphabetic Cipher
- 15. Multiple Choice
Cipher based on substitution, using multiple substitution alphabets is called:
Polyalphabetic cipher
Monoalphabetic cipher
Polycipher
Monocipher
- 16. Multiple Choice
Tick all examples of Monoaplhabetic Ciphers:
Caesar Cipher
Vigenere Cipher
Keypad Cipher
Morse Code Cipher
- 17. Multiple Choice
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
- 18. Multiple Choice
key
algorithm for transforming plaintext to ciphertext
info used in cipher known only to sender/receiver
•recovering ciphertext from plaintext
•converting plaintext to ciphertext
- 19. Multiple Choice
encipher
converting plaintext to ciphertext
coded message
•study of principles/methods of deciphering ciphertext without knowing key
study of encryption principles/methods
- 20. Multiple Choice
decipher
original message
algorithm for transforming plaintext to ciphertext
recovering plaintext from ciphertext
•field of both cryptography and cryptanalysis
- 21. Multiple Choice
What is the name of the method in which letters are rearranged to create the ciphertext?
one-time pad
enigma
substitution
transposition
- 22. Multiple Choice
What term is used to describe concealing data in another file such as a graphic, audio, or other text file?
obfuscation
hiding
masking
steganography
- 23. Multiple Choice
Which type of cipher is able to encrypt a fixed-length block of plaintext into a 128-bit block of ciphertext at any one time?
hash
symmetric
block
stream
transform
- 24. Multiple Choice
Which asymmetric algorithm provides an electronic key exchange method to share the secret key?
DES
WEP
hashing
Diffie-Hellman
RSA
- 25. Multiple Choice
What encryption algorithm uses one key to encrypt data and a different key to decrypt data?
symmetric
transposition
one-time pad
asymmetric
- 26. Multiple Choice
Encrypt the word alphabet using a Caesar cipher with a shift of 3
DVSDULQV
DOOFOHDU
DOSKDEHW
DORQHBHV
- 27. Multiple Choice
A Caesar cipher is an example of a ______________________.
transposition cipher
bimodal cipher
substitution cipher
substantial cipher
- 28. Multiple Choice
The following word was encrypted using a Caesar cipher with a shift of 2: ecguct. What word is it?
julius
caesar
romans
cipher
- 29. Multiple Choice
By encrypting "Hello world" using a rail fence cipher of size 3, the output will be:
LDWORLO_HEL
HLWLEOODL_R
HORE_LLWDLO
LOLWDE_LHOR
- 30. Multiple ChoiceWhat machine was used during WWII to encrypt and decrypt German messages?EnigmaAtbashSecretPuzzler
- 31. Multiple Choice
A 4X5 matrix cipher was used to encrypt "good morning everyone". What will it be output?
GMIVOOONENORGREDNEY
GOGYOREOONVNDIEEMNR
GDRNVYEOMNGEOOOIERN
- 32. Multiple Choice
"letters" has been encrypted with Caesar cipher to "cvkkvij". The key used was:
16
14
18
17
- 33. Multiple Choice
"PLAINTEXT" has been encrypted with Caesar cipher to "AWLTYEPIE". The key used was:
16
12
11
19
- 34. Multiple Choice
It is a value that is known to the sender.
Decryption Key
Encryption Key
PKI
- 35. Fill in the Blank
DES stands for?
- 36. Multiple Choice
This person, known as the father of Computer Science, invented the CAPTCHA.
Alan Turing
Vigenere
Bill Gates
Cliff Stoll
- 37. Multiple Choice
What is the US governmental standard for encryption?
Advanced Encryption Standard
Asymmetric Encryption Standard
RC4 Encryption Standard
Data Encryption Standard
- 38. Multiple Choice
This is an example of what type of cipher?
Enigma cipher
Pigpen cipher
Stream cipher
Atbash cipher
- 39. Multiple Choice
This type of cipher mixes a number of ciphertext alphabets in the cryptogram so each plain letter text is continuously changed.
Monoalphabetic substitution cipher
Polyalphabetic substitution cipher
Caesar cipher
Monastic cipher
- 40. Multiple ChoiceBefore computers why were messages usually encrypted?They weren't encrypted before computersSo in war Commanders/leaders could communicate safely with their troopsTo share messages with people who were clever enough to solve themAll of these reason
- 41. Multiple Choice
Which of the following statements is INCORRECT?
Original methods of encryption (such as the Caesar Cipher) do not need the use of a key
Data can be encrypted using ciphers and decrypted using a key
Users cannot read or understand encrypted data without the use of a key
The Caesar Cipher is an example of a substitution cipher
- 42. Multiple Choice
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
- 43. Multiple Choice
What was the name of the place in the UK that worked on decoding Enigma messages?
Bletchley Park
Buckingham Palace
The Bombe
Turing Park
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