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A Refined Definition of Semantic Security for Public-Key Encryption Schemes
Hideaki SAKAI Noriko NAKAMURA Yoshihide IGARASHI
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2001/01/01
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Selected Papers from LA Symposium)
chosen-ciphertext attack, indistinguishability, information security, chosen-plaintext attack, public-key encryption, semantic security,
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We introduce a refined definition of semantic security. The new definition is valid against not only chosen-plaintext attacks but also chosen-ciphertext attacks whereas the original one is defined against only chosen-plaintext attacks. We show that semantic security formalized by the new definition is equivalent to indistinguishability, due to Goldwasser and Micali for each of chosen-plaintext attacks, non-adaptive chosen-ciphertext attack, and adaptive chosen-ciphertext attack.