Encryption GCSE

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Question 1 of 10

1. Question
Which of the following statements best describes ‘Encryption’?
- Encryption is the encoding of data in order to reduce the size of the file before storage or transmission.
- Encryption is the conversion of information (or data) into a code, which is not readily understandable.
- Encryption is simply the shifting of letters in a message, so that it is harder to understand.
- Encryption is the process of making sense of data which has been scrambled.
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Question 2 of 10

2. Question
The following message has been encrypted using a Caesar Cipher, with a left shift of 3.
Kfzb clla
What was the original message?
- Well done
- Hard rock
- Nowt good
- Carp fish
- Nice food
- Work hard
- Year book
- Good luck
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Question 3 of 10

3. Question
The following message has been encrypted using a Caesar Cipher, with a left shift of 3.
Zxom cfpe
What was the original message?
- Well done
- Hard rock
- Nowt good
- Carp fish
- Nice food
- Work hard
- Year book
- Good luck
Correct

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Question 4 of 10

4. Question
The following message has been encrypted using a Caesar Cipher, with a left shift of 3.
Exoa olzh
What was the original message?
- Well done
- Hard rock
- Nowt good
- Carp fish
- Nice food
- Work hard
- Year book
- Good luck
Correct

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Question 5 of 10

5. Question
The following message has been encrypted using a Caesar Cipher, with a right shift of 3.
Jrrg Oxfn
What was the original message?
- Well done
- Hard rock
- Nowt good
- Carp fish
- Nice food
- Work hard
- Year book
- Good luck
Correct

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Question 6 of 10

6. Question
The following message has been encrypted using a Caesar Cipher, with a right shift of 3.
Zhoo grqh
What was the original message?
- Well done
- Hard rock
- Nowt good
- Carp fish
- Nice food
- Work hard
- Year book
- Good luck
Correct

Incorrect
Question 7 of 10

7. Question
The following message has been encrypted using a Caesar Cipher, with a right shift of 3.
Zrun kdug
What was the original message?
- Well done
- Hard rock
- Nowt good
- Carp fish
- Nice food
- Work hard
- Year book
- Good luck
Correct

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Question 8 of 10

8. Question
Why are Caesar Cipher encryptions quite easy to crack?
- Caesar Ciphers always shift letters 2 or 3 places, so it doesn’t take long to see which shift has been used.
- Languages of the world always have some characters that are used more frequently than others. Using this knowledge it can be easy to work out the shift used in the encryption.
- Caesar Ciphers are always packaged with the encryption key (asymmetric) and are therefore easy to decrypt.
- Caesar Ciphers only take a maximum of 26 attempts to crack because there are only 26 letters in the English alphabet.
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Question 9 of 10

9. Question
What is asymmetric encryption?
- Asymmetric encryption is where the same key is used to encrypt and decrypt a file. This means that the key also has to be passed from the sender to the recipient in order for them to decrypt and read the message.
- Asymmetric encryption uses two separate keys for the encrypt/decrypt process. One is used to encrypt the file and another is used to decrypt it. With asymmetric encryption, the encryption key is made public and is used by people who wish to send you data securely. You (the recipient) will own a separate private key which can be used to decrypt the file.
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Question 10 of 10

10. Question
What is symmetric encryption?
- Symmetric encryption is where the same key is used to encrypt and decrypt a file. This means that the key also has to be passed from the sender to the recipient in order for them to decrypt and read the message.
- Symmetric encryption uses two separate keys for the encrypt/decrypt process. One is used to encrypt the file and another is used to decrypt it. With symmetric encryption, the encryption key is made public and is used by people who wish to send you data securely. You (the recipient) will own a separate private key which can be used to decrypt the file.
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Encryption GCSE

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