Alice and Bob are using the ElGamal cipher with the parameters ?=19p=19 and ?=2α=2. Their parameters are small and we decide to crack the cipher. Suppose Alice is observed sending public ephemeral key ??=7kE=7 and Bob sends public key ?=17β=17. Alice is observed transmitting the ciphertext ?=5y=5. a) What is the masking key ??kM? b) What is the plaintext?

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