Cryptography (Y8)

What 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 machine
• What is put in, taken in, or operated on by any process or system.

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

Who was the first known user of the Caesar Cipher?

• Caesar Romanus

• Julius Caesar

• Alan Turing

• There isn't one

In Cryptography, the 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

A Caesar cipher is an example of a ______________________.

• transposition cipher

• bimodal cipher

• substitution cipher

• substantial cipher

Encrypt the word alphabet using a Caesar cipher with a shift of 3

• DVSDULQV

• DOOFOHDU

• DOSKDEHW

• DORQHBHV

The process of converting a ciphertext into plaintext.

• encryption

• decryption

• plaintext

• cryptography