History
The notion of semantic security was first put forward by Goldwasser and Micali in 1982. However, the definition they initially proposed offered no straightforward means to prove the security of practical cryptosystems. Goldwasser/Micali subsequently demonstrated that semantic security is equivalent to another definition of security called ciphertext indistinguishability. This latter definition is more common than the original definition of semantic security because it better facilitates proving the security of practical cryptosystems.
Read more about this topic: Semantic Security
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