I was wondering if somebody could tell me what the impication is of an encryption scheme lacking ind-cca or ind-cpa security. For example, the ElGamal scheme is known to lack ind-cca security. The Helios voting protocol uses ElGamal to encrypt each ballot - what I am have a difficult time understanding is what the implication is of ElGamal having an efficient ind-cpa adversary and ElGamal being used in Helios.
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