Cryptology ePrint Archive: Report 2004/272

A Characterization of Authenticated-Encryption as a Form of Chosen-Ciphertext Security

Tom Shrimpton

Abstract: In this note we introduce a variation of the standard definition of chosen-ciphertext security, which we call IND-CCA3, and prove that IND-CCA3 is equivalent to authenticated-encryption.

Category / Keywords: secret-key cryptography / authenticated-encryption, definitions, chosen-ciphertext security

Date: received 18 Oct 2004

Contact author: teshrim at cs pdx edu

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Version: 20041021:200537 (All versions of this report)

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