
Cipher Encryption
Authored by Jose Manuel Rios
Computers
6th - 8th Grade
Used 103+ times

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7 questions
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1.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Julius Caesar used a extremely simple substitution cipher to send messages to his troops. He substituted each letter by the letter that was 3 places further along in the alphabet, so that “a” was replaced with “D”, “b” with “E” and so on. This is a substitution cipher with a key of 3.
Using a key of 5, encrypt the word miami
2.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Julius Caesar used a extremely simple substitution cipher to send messages to his troops. He substituted each letter by the letter that was 3 places further along in the alphabet, so that “a” was replaced with “D”, “b” with “E” and so on. This is a substitution cipher with a key of 3.
Using a key of 7, encrypt the word cheeseburger
3.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Decryption is the technique of reversing an encrypted message into plaintext. If we know the key used to encrypt, we can easily subtract the key value to find the plaintext.
If a key of 9 was used to perform the encryption, decrypt the following word: yriij
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Decryption is the technique of reversing an encrypted message into plaintext. If we know the key used to encrypt, we can easily subtract the key value to find the plaintext.
If a key of 4 was used to perform the encryption, decrypt the following word: LETTC JVMHEC
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Convert "GJGB" cipher-text back into plain text using the key: 1
FIFA
HOME
COCO
YEAR
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
CHICKEN WINGS is plain text and the cipher text is: MRSMUOX GSXQC - What would the encryption key be?
10
7
6
11
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
SUBWAY is plain text and the cipher text is: WYFQAEC - What would the encryption key be?
10
4
6
3
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