10-02_task

Name: Date: School: Facilitator: 10.02 Ciphers, Cryptosystems, Encrypting, and Decrypting (50 Points) Terminology (14 points) Match each term with its definition. Terms: 1. Caesar cipher 2. Cipher 3. Ciphertext 4. Cryptosystems 5. Decryption 6. Encryption 7. Random substitution cipher Definitions: A set of instructions that are used for performing encryption or decryption An encryption system in which each letter of the alphabet is mapped to another random letter of the alphabet The process of transforming encrypted data into its original form Encrypted text transformed from the original text An encryption system in which the characters of the alphabet are shifted to create a secret alphabet system The process of changing data to keep it safe and secure © ACCESS Virtual Learning 2021

Secure information and communication techniques that are derived from algorithms Caesar Cipher (24 points) 8. Use an alphabetic Caesar shift cipher with a shift of 6 right to encrypt the following message: Look on Main Street . Complete the table and write the final code in 4 letter blocks. Original A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Maps to Write the final code in 4 letter blocks: 9. Encrypt the word SHIELD using an alphabetic Caesar shift cipher that starts with a shift of 8 (A to I) and shifts one additional space after each character is encrypted. Origin al A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Maps to I J K L M N O P Q R S T U V W X Y Z A B C D E F G H Write the encrypted message for the word SHIELD : 10. Decrypt the letters XMMIFZXQFLKP if it was encrypted using an alphabetic Caesar shift cipher with shift 23 right. Complete the table and write the decrypted message below. Original A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Maps to Decrypted message for XMMIFZXQFLKP : © ACCESS Virtual Learning 2021