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( a ) Given the ciphertext and key below, find the plaintext if the Playfair cipher was used. x is the special character used for
a Given the ciphertext and key below, find the plaintext if the Playfair cipher was used. is the special character used for padding and i and are treated as the same character.
C eiioqoyldc
security
write your final answer here; show your calculations below
bi A polyalphabetic cipher such as the above Vigenre is stronger against letter frequency analysis when compared to a monoalphabetic cipher like Caesar. Explain why.
ii Despite being stronger than monoalphabetic ciphers, the Vigenre cipher is still subject to letter frequency attacks. Explain why.
iii Can the modified Vigenre cipher in this question be used as a onetime pad. If yes, then explain how. If no then explain why not.
c Draw a matrix that shows the relationship between security services and attacks.
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