Question: An IND - CPA secure encryption scheme might not conceal identities, in the following sense: given a pair of ciphertexts C , C for equal

An IND-CPA secure encryption scheme might not conceal identities, in the following
sense: given a pair of ciphertexts C, C for equal-length messages, it might be obvi-
ous if the ciphertexts were encrypted using the same random key or were encrypted
using two different random keys. Demonstrate an example of a (plausibly) IND-CPA
secure encryption scheme that has this property of being identity-revealing. You
do not have to prove that the scheme is IND-CPA secure.

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