Why does Paul need cryptography?, To write faster., To keep his messge secret., To learn a new language., To find his friend., What is a normal message written in English called?, Ciphertext, Encryption, Code, Plaintext, Why is plaintext easy to read?, It is very short., It uses numbers., People understand the language., It is encrypted., What does encrypt mean?, To send a message., To hide a message., To read a message., To change it into a secret code., What secret word does Paul use in the example?, Hello, Friend, Fun, Code, Before encrypting, Paul change letter into:, Numbers, Pictures, Sounds, Symbols, What is a key used for?, Opening an envelope, Writing the message, Changing the message into code, Delivering the letter., What is the coded message called?, Plaintext, Ciphertext, Password, Decryption, Why can't other people read the ciphertext?, It is too small, It is in English, They don't have the key, It is too long, What does Paul's friend need to read the message?, A dictionary, The envelope, The decryption key, A new language, What is the process of turning code back into the original message called?, Encryption, Decryption, Coding, Translation, After decryption, the message becomes:, Numebrs, Ciphertext, Plaintext again, A password.

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