= Ciphertext indistinguishability
{wiki=Ciphertext_indistinguishability}
Ciphertext indistinguishability is a property of encryption schemes that ensures that, given two different plaintext messages, an adversary cannot distinguish which of the two messages corresponds to a given ciphertext, even if the adversary possesses some knowledge about the plaintexts or has access to ciphertexts generated from them. This property is crucial for achieving security in cryptographic systems, particularly in the context of public key encryption and other symmetric encryption schemes.
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