WorksheetsYear 8 Keep it safe 2
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Why do we need cryptography in computing?
a)
to keep confidential information secure
b)
to help make more money
c)
to stop spam emails
d)
to speed up computers
2.
Where does the word 'Cryptography' come from?
a)
secret writing
b)
Roman writing
c)
difficult messages
d)
writing problem
3.
What is a cypher?
a)
a coded message
b)
a way of putting a message into code
c)
a decoded message
d)
a way of decoding a message
4.
What is plaintext?
a)
a coded message
b)
a way of putting a message into code
c)
a message which is in plain English
d)
a way of decoding a message
5.
What is the opposite of plaintext?
a)
cyphertext
b)
prettytext
c)
plainpics
d)
encryption
6.
What type of encryption is a Caesar cypher?
a)
substitution cypher
b)
roller cypher
c)
complex cypher
d)
uncrackable code
7.
If you were to encrypt the word hello using a Caesar cypher with a key of 2, which would it be?
a)
jgnnq
b)
abcde
c)
abrro
d)
fbaae
8.
What word encrypted using a Caesar Cypher and the key 3 would be: wrgdb
a)
maker
b)
lesson
c)
coded
d)
today
9.
If you encrypted the word lesson using a Caesar cypher with a key of 1 which would it be?
a)
mgvvqr
b)
mfttpo
c)
kdttph
d)
kjdfkj
10.
What was the name of the German code machine in the second world war?
a)
Anger
b)
Puzzle
c)
Enigma
d)
Encoder
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