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Cryptography and Network Security 2026-27
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The plaintext HELLO is encrypted with key KEY under variant:
I. Vigenère (C = P + K)
Which matching with the ciphertext {RIJVS} is correct?
A Hill cipher with key K = [3 3; 2 5] (mod 26) encrypts 2-letter blocks as C = K·P (column vector P). The plaintext
. An autokey cipher uses the priming keyword DEAD , after which the plaintext itself continues the key stream. The plaintext