On Actively-Secure Elementary MPC Reductions
On Actively-Secure Elementary MPC Reductions
复制标题
关于主动安全的基本 MPC 缩减
DOI:
10.1007/978-3-030-90459-3_24
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Benny Applebaum, Aarushi Goel
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文献类型:
--
作者:
Benny Applebaum, Aarushi Goel
We introduce the notion ofelementary MPCreductions that allow us to securely compute a functionalityfby making a single call to a constant-degree “non-cryptographic” functionalitygwithout requiring any additional interaction. Roughly speaking, “non-cryptographic” means thatgdoes not make use of cryptographic primitives, though the parties can locally call such primitives.Classical MPC results yield such elementary reductions in various cases including the setting of passive security with full corruption threshold(Yao, FOCS’86; Beaver, Micali, and Rogaway, STOC’90), the setting of full active security against a corrupted minority(Damgård and Ishai, Crypto’05), and, forfunctionalities, even for the setting of full active (information-theoretic) security with full corruption threshold of(Ishai and Kushilevitz, FOCS’00). This leaves open the existence of an elementary reduction that achieves full active security in the dishonest majority setting for all efficiently computable functions.Our main result shows that such a reduction is unlikely to exist. Specifically, the existence of a computationally secure elementary reduction that makes black-box use of a PRG and achieves a very weak form of partial fairness (e.g., that holds only when the first party is not corrupted) would allow us to realize any efficiently-computable function by aconstant-roundprotocol that achieves a non-trivial notion of information-theoretic passive security. The existence of the latter is a well-known 3-decade old open problem in information-theoretic cryptography (Beaver, Micali, and Rogaway, STOC’90).On the positive side, we observe that this barrier can be bypassed under any of the following relaxations: (1) non-black-box use of a pseudorandom generator; (2) weaker security guarantees such as security with identifiable abort; or (3) an additional round of communication with the functionalityg.
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DOI:
10.1109/focs46700.2020.00121
发表时间:
2020-11
期刊:
2020 IEEE 61st Annual Symposium on Foundations of Computer Science (FOCS)
影响因子:
--
作者:
Benny Applebaum;Eliran Kachlon;A. Patra
通讯作者:
Benny Applebaum;Eliran Kachlon;A. Patra
DOI:
--
发表时间:
2020
期刊:
IACR Cryptology ePrint Archive
影响因子:
--
作者:
Carsten Baum;Emmanuela Orsini;Peter Scholl;Eduardo Soria
通讯作者:
Eduardo Soria
DOI:
--
发表时间:
2017
期刊:
Foundations of Software Technology and Theoretical Computer Science
影响因子:
--
作者:
V. Vaikuntanathan
通讯作者:
V. Vaikuntanathan
DOI:
--
发表时间:
2018
期刊:
IACR Cryptology ePrint Archive
影响因子:
--
作者:
Sanjam Garg;Yuval Ishai;Akshayaram Srinivasan
通讯作者:
Akshayaram Srinivasan
DOI:
10.1007/978-3-540-24676-3_26
发表时间:
2004
期刊:
SubStance
影响因子:
--
作者:
Yuval Ishai;E. Kushilevitz
通讯作者:
E. Kushilevitz