Massive Attack | Attack on Pearl Harbor | attack on Pearl Harbor | Star Wars Episode II: Attack of the Clones | attack | The Chosen | suicide attack | 2012 Benghazi attack | Joint Direct Attack Munition | Jack-Jack Attack | Chosen | Blood II: The Chosen | Attack Attack! | Suicide attack | Milltown Cemetery attack | Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack | Attack the Block | Attack on Sydney Harbour | Attack of the Show! | Attack of the Killer Tomatoes | 2007 Glasgow International Airport attack | Young Heart Attack | This Heart Attack | The Chosen One (2010 film) | The Chosen One | Standoff Land Attack Missile | Sarin gas attack on the Tokyo subway | Oktoberfest terror attack | Massive Attack's | Korean Attack Submarine program |
Variants of this definition define indistinguishability under chosen ciphertext attack and adaptive chosen ciphertext attack (IND-CCA, IND-CCA2).
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Unlike other security definitions, semantic security does not consider the case of chosen ciphertext attack (CCA), where an attacker is able to request the decryption of chosen ciphertexts, and many semantically secure encryption schemes are demonstrably insecure against chosen ciphertext attack.