Code Breaking Challenge
This worksheet challenges Grade 11 students with various code-breaking techniques, including Caesar ciphers, Vigenere ciphers, and basic cryptanalysis.
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Code Breaking Challenge
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Welcome, aspiring cryptographers! This worksheet will test your skills in decoding various ciphers. Read each question carefully and apply your knowledge of code-breaking techniques.
1. If the word "APPLE" is encrypted using a Caesar cipher with a shift of 3, what is the encrypted word?
DSUOH
DSSOH
DSXOO
DSQPH
2. The Vigenere cipher uses a series of Caesar ciphers based on the letters of a .
3. To decrypt a Vigenere cipher message, you need both the ciphertext and the .
4. Explain how frequency analysis can be used to break a simple substitution cipher.
5. A polyalphabetic cipher is generally harder to break than a monoalphabetic cipher.
True
False
6. Decode the following message, which was encrypted using a Caesar cipher. The most frequent letter in the ciphertext is 'Q'.
Ciphertext: QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV
7. Match each cipher type with its description.
a. Caesar Cipher
i. Shifts letters by a fixed number of positions.
b. Vigenere Cipher
ii. Uses a keyword to determine multiple shifts.
c. Atbash Cipher
iii. Reverses the alphabet (A becomes Z, B becomes Y, etc.).
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