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WorksheetsQuiz 4: Internet safety, cyber security and encryption
Total questions: 13
Worksheet time: 13mins
The word 'encryption' means to --------- a message so that no one else can understand it.
solve
copy
delete
scramble
The word ------------- means to unscramble a message so that it makes sense again.
decryption
key
encryption
send
A message is a type of encryption. Knowing which ---------- was used is essential if you want to turn it back into a readable message.
Transmission
cipher
message
plain text
The original message is sometimes called plain text , and the encrypted message is sometimes called ------------ .
algorithm
ciphertext
key
message
The -------- is a special value used in encryption. Knowing this value should make it easy to decrypt a message. Not knowing it should make it very difficult.
key
algorithm
cipher
True or false? The Atbash Cipher uses a key, which the person receiving the message must use to decrypt it.
True
False
True or false? When using the Atbash Cipher, the letters of the alphabet are written out twice, once forwards and once backwards.
True
False
Encrypt this plaintext message: BACK
(a)
Decrypt this ciphertext message: HKRVH
(a)
True or false? The Caesar Cipher uses a key which the person receiving the message must use to decrypt it.
True
False
True or false? When using the Caesar Cipher the letters in the ciphertext row should be shifted to the right.
True
False
Use the Caesar Cipher with Key 1 to encrypt this plaintext message: CODES
(a)
Use the Caesar Cipher with Key 3 to decrypt this ciphertext message: HDVLOB
(a)
