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Paper 2019/1307

ABERand: Effective Distributed Randomness on Ciphertext-Policy Attribute-Based Encryption

Liang Zhang and Haibin Kan and Zening Chen and Ziqi Mao and Jinjie Gao

Abstract

Distributed randomness is very useful for many applications, such as smart contract, proof-of-stake-based blockchain, elliptic curve generation and lottery. Randomness beacon protocols are proposed, which are aimed at continuously distributed randomness generation. However, a reliable source of distributed randomness is gained with difficulty because of Byzantine behavior, which may lead to bias for distributed randomness. These Byzantine behaviors include, but not limited to, the “last actor” problem, DoS attack and collusion attack. Various cryptography schemes have been used to generate distributed randomness. Current constructions face challenging obstacles due to high complexity and bias problems. Given these barriers, we propose a new protocol that is the first precept to utilize attribute-based encryption in a commit-and-reveal scheme for distributed randomness (ABERand). Compared to existing public distributed randomness protocols, ABERand possesses distinguished flexibility, security and efficiency. It is primarily because of trading space for time. More specifically, we resolve the “last actor” problem and make ABERand an intensive out- put randomness beacon with communication complexity O(n3), computation complexity O(1), verification complexity O(n) and communication complexity O(n) of nodes adding/removing.

Metadata
Available format(s)
-- withdrawn --
Category
Cryptographic protocols
Publication info
Preprint.
Keywords
distributed randomnessspace-for-timecommit-and-revealblockchain
Contact author(s)
briliasm @ gmail com
History
2021-04-08: withdrawn
2019-11-13: received
See all versions
Short URL
https://ia.cr/2019/1307
License
Creative Commons Attribution
CC BY
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