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 obvious if the
ciphertexts were encrypted using the same random key or were encrypted using two different random
keys. Give an example of a (plausibly) IND-CPA secure encryption scheme that has this is identityrevealing. Then give a definition for identity-concealing encryption. Your definition should imply
IND-CPA security but a scheme meeting your definition cant be identity-revealing.

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