Paper 2012/006

Detecting Dangerous Queries: A New Approach for Chosen Ciphertext Security

Susan Hohenberger, Allison Lewko, and Brent Waters


We present a new approach for creating chosen ciphertext secure encryption. The focal point of our work is a new abstraction that we call "Detectable Chosen Ciphertext Security" (DCCA). Intuitively, this notion is meant to capture systems that are not necessarily chosen ciphertext attack (CCA) secure, but where we can detect whether a certain query CT can be useful for decrypting (or distinguishing) a challenge ciphertext CT*. We show how to build chosen ciphertext secure systems from DCCA security. We motivate our techniques by describing multiple examples of DCCA systems including creating them from 1-bit CCA secure encryption --- capturing the recent Myers-shelat result (FOCS 2009). Our work identifies DCCA as a new target for building CCA secure systems.

Note: Minor typos fixed.

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Publication info
Published elsewhere. Full version of paper in Eurocrypt 2012.
chosen ciphertext securityencryption
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susan @ cs jhu edu
2012-05-16: last of 2 revisions
2012-01-05: received
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      author = {Susan Hohenberger and Allison Lewko and Brent Waters},
      title = {Detecting Dangerous Queries: A New Approach for Chosen Ciphertext Security},
      howpublished = {Cryptology ePrint Archive, Paper 2012/006},
      year = {2012},
      note = {\url{}},
      url = {}
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