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WorksheetsComputer security Grade 7
Total questions: 36
Worksheet time: 36mins
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
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 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
Plaintext
original message
coded message
algorithm for transforming plaintext to ciphertext
info used in cipher known only to sender/receiver
ciphertext
•field of both cryptography and cryptanalysis
•study of encryption principles/methods
•converting plaintext to ciphertext
•coded message
cryptanalysis
field of both cryptography and cryptanalysis
study of encryption principles/methods
•study of principles/methods of deciphering ciphertext without knowing key
converting plaintext to ciphertext
An encryption algorithm transforms plain text into:
Cipher text
Simple Text
Empty Text
Plain Text
Encrypt the word alphabet using a Caesar cipher with a shift of 3
DOSKDEHV
DOSKDEHU
DOSKDEHW
DOSKDEHX
The following word was encrypted using a Caesar cipher with a shift of 2: ecguct. What word is it?
julius
caesar
romans
cipher
What encryption algorithm uses the same pre-shared key to encrypt and decrypt data?
hash
one-time pad
symmetric
asymmetric
The two methods of encrypting data are?
Substitution and transposition
Block and stream
Symmetric and asymmetric
DES and AES
"CIPHERTEXT" has been encrypted with Caesar cipher to "EKRJGTVGZV". The key used was:
7
6
3
2
Cryptography is the science of encrypting or hiding information.
True
False
Encrypted text
Ciphertext
Plaintext
Algorithm
Cipher
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.
Each letter is replaced with a completely random number
"Technique of combining words to hide information "
What is the above statement referring to?
Crypto currency
Psychology
Cryptography
Biology
The method of hiding the actual meaning of plaintext is called
key
decryption
encryption
plaintext
Using table above for Caesar Cipher, convert the plaintext "GORENG" to ciphertext
HPSFOP
HPSFAQ
HPSFOH
HPSFAD
Using table above for Caesar Cipher, convert the plaintext "DUDUK" to ciphertext
EVEVQ
EVEVL
EVEVP
EVEVR
A word has been encrypted with a Caesar cipher to CBU. The key used was 1. What was the original word?
abc
3
Bat
one
Alan Turing helped decrypt codes that helped during which era?
The Plague
Word War 2
The 1980s
The Millennium
TTSTWP HHOHAL EENANA WRITTY EICWT ASEEO.
Decrypt this message by using Transposition Cipher Method.
The weather is so nice that we want to sleep
The weather is so nice that we want to eat
The weather is so nice that we want to study
The weather is so nice that we want to play
It is an attack in which the interceptor only reads the message.
Active Attack
Passive Attack
Direct Attack
Indirect Attack
