Cryptography Basics

To encrypt a message you need 2 main parts, a _________ & a key

• cipher

• code

• algorithm

• crypt

In Cryptography, original message, before being transformed, is called

• Simple Text

• Plain Text

• Cipher Text

• Filled 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

An encryption algorithm transforms plain text into:

• Cipher text

• Simple Text

• Empty Text

• Plain Text

A(n) ______ algorithm transforms cipher text to plain text.

• Encryption

• Decryption

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

An encryption key is used to help decrypt messages

• True
• False

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