Characterization of Secure Multiparty Computation Without Broadcast

Ran Cohen, Iftach Haitner, Eran Omri, Lior Rotem

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

8 اقتباسات (Scopus)

ملخص

A major challenge in the study of cryptography is characterizing the necessary and sufficient assumptions required to carry out a given cryptographic task. The focus of this work is the necessity of a broadcast channel for securely computing symmetric functionalities (where all the parties receive the same output) when one third of the parties, or more, might be corrupted. Assuming all parties are connected via a point-to-point network, but no broadcast channel (nor a secure setup phase) is available, we prove the following characterization:A symmetric n-party functionality can be securely computed facing n/ 3 ≤ tOpenSPiltSPi n/ 2 corruptions (i.e., honest majority), if and only if it is (n- 2 t) -dominated; a functionality is k-dominated, if anyk-size subset of its input variables can be set to determine its output to some predetermined value.Assuming the existence of one-way functions, a symmetric n-party functionality can be securely computed facing t≥ n/ 2 corruptions (i.e., no honest majority), if and only if it is 1-dominated and can be securely computed with broadcast. It follows that, in case a third of the parties might be corrupted, broadcast is necessary for securely computing non-dominated functionalities (in which “small” subsets of the inputs cannot determine the output), including, as interesting special cases, the Boolean XOR and coin-flipping functionalities.

اللغة الأصليةالإنجليزيّة
الصفحات (من إلى)587-609
عدد الصفحات23
دوريةJournal of Cryptology
مستوى الصوت31
رقم الإصدار2
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 1 أبريل 2018

بصمة

أدرس بدقة موضوعات البحث “Characterization of Secure Multiparty Computation Without Broadcast'. فهما يشكلان معًا بصمة فريدة.

قم بذكر هذا