The word---------- means to unscramble a message so that it makes sense again.

The original message is sometimes called--------- , and the encrypted message is sometimes called------------

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.

_____ is a type of encryption. Knowing which ______ was used is essential if you want to turn it back into a readable message.

True or false? The Atbash Cipher uses a key, which the person receiving the message must use to decrypt it.

True or false? When using the Atbash Cipher, the letters of the alphabet are written out twice, once forwards and once backwards.

Encrypt this plaintext message: BACK

Decrypt this ciphertext message: HKRVH

True or false? The Caesar Cipher uses a key which the person receiving the message must use to decrypt it.

True or false? When using the Caesar Cipher the letters in the ciphertext row should be shifted to the right

Use the Caesar Cipher with Key 1 to encrypt this plaintext message: CODES

Use the Caesar Cipher with Key 3 to decrypt this ciphertext message: HDVLOB