Lossy trapdoor functions from homomorphic reproducible encryption

  • Authors:
  • Seung Geol Choi;Hoeteck Wee

  • Affiliations:
  • Department of Computer Science, University of Maryland, College Park, MD 20742, USA;Department of Computer Science, George Washington University, 801 22nd Street NW, Washington, DC 20052, USA

  • Venue:
  • Information Processing Letters
  • Year:
  • 2012

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Abstract

Reproducible public-key encryption (reproducible PKE) provides an alternative way of encryption, which is called a reproduction algorithm, in addition to normally applying the encryption algorithm with the message and the randomness - applying the reproduction algorithm with the message, the secret key, and a ciphertext (possibly encrypted under a different public key). In this work, we show how to construct lossy trapdoor functions from homomorphic reproducible PKE, generalizing the DDH-based construction given by Peikert and Waters (STOC 2008). We also show that reproducible PKE can be constructed from standard number-theoretic assumptions, including DDH, QR, and DCR, and from smooth projective hash proof systems.