Efficient and Universally Composable Committed Oblivious Transfer and Applications

Juan Garay; Philip MacKenzie; Ke Yang

Paper 2004/053 Original: eprint.iacr.org/2004/053 ↗

Efficient and Universally Composable Committed Oblivious Transfer and Applications

Juan Garay

Philip MacKenzie

Ke Yang

Abstract

Committed Oblivious Transfer (COT) is a useful cryptographic primitive that combines the functionalities of bit commitment and oblivious transfer. In this paper, we introduce an extended version of COT (ECOT) which additionally allows proofs of relations among committed bits, and we construct an efficient protocol that securely realizes an ECOT functionality in the universal-composability (UC) framework in the common reference string (CRS) model. Our construction is more efficient than previous (non-UC) constructions of COT, involving only a constant number of exponentiations and communication rounds. Using the ECOT functionality as a building block, we construct efficient UC protocols for general two-party and multi-party functionalities (in the CRS model), each gate requiring a constant number of ECOT's.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
History: 2004-02-23: last updated; 2004-02-22: published
Short URL: https://ia.cr/2004/053
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2004/053,
      author = {Juan Garay and Philip MacKenzie and Ke Yang},
      title = {Efficient and Universally Composable Committed Oblivious Transfer and Applications},
      howpublished = {Cryptology {ePrint} Archive, Paper 2004/053},
      year = {2004},
      url = {https://eprint.iacr.org/2004/053}
}