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SPDZ (pronounced " Speedz ") is the nickname of the MPC protocol of Damgård et al. from Crypto 2012. SPDZ provided various efficiency innovations on both the theoretical and practical sides compared to previous work in the preprocessing model. In this paper we both resolve a number of open problems with SPDZ; and present several theoretical and practical(More)
We describe an implementation of the protocol of Damgård, Pastro, Smart and Zakarias (SPDZ/Speedz) for multi-party computation in the presence of a dishonest majority of active adversaries. We present a number of modifications to the protocol; the first reduces the security to covert security, but produces significant performance enhancements; the second(More)
We extend the Tiny-OT two party protocol of Nielsen et al (CRYPTO 2012) to the case of n parties in the dishonest majority setting. This is done by presenting a novel way of transferring pairwise authentications into global authentications. As a by product we obtain a more efficient manner of producing globally authenticated shares, in the random oracle(More)
On top of the passively secure extension protocol of [IKNP03] we build a new construction secure against active adversaries. We can replace the invocation of the hash function that is used to check the receiver is well-behaved with the XOR of bit strings. This is possible by applying a cut-and-choose technique on the length of the bit strings that the(More)
We present a unified view of the two-party and multi-party computation protocols based on oblivious transfer first outlined in Nielsen et al and Larraia et al. We present a number of modifications and improvements to these earlier presentations, as well as full proofs of the entire protocol. Improvements include a unified pre-processing and online MAC(More)
We provide constructions of multilinear groups equipped with natural hard problems from indistinguishability obfuscation, homomor-phic encryption, and NIZKs. This complements known results on the constructions of indistinguishability obfuscators from multilinear maps in the reverse direction. We provide two distinct, but closely related constructions and(More)
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