Introduction to Cryptography

Why does Paul need to use cryptography to send his message?

• To ensure his friend receives the message faster

• To prevent unauthorized people from reading the message

• To make the message more interesting

• To translate the message into another language

What is the first step in encrypting a message?

• Writing the message in a secret code

• Sending the message directly to the recipient

• Converting the message into numerical form

• Hiding the message in a book

What is the term used for the unreadable form of an encrypted message?

• Hidden text

• Cipher text

• Plain text

• Secret text

What does Paul's friend need to convert the cipher text back into plain text?

• A magnifying glass

• A computer program

• A decryption key

• A special dictionary

What is the final step in the cryptographic process?

• Destroying the cipher text

• Converting the numerical value back to the original language

• Writing a new message

• Sending the cipher text to another friend