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Distributed key generation : ウィキペディア英語版
Distributed key generation
Distributed key generation (DKG) is an encryption process in which multiple parties contribute to the calculation of a shared public and private key set. Unlike most public key encryption models, distributed key generation does not rely on Trusted Third Parties.〔 Instead, the participation of a threshold of honest parties determines whether a key pair can be computed successfully.〔 Distributed key generation prevents single parties from having access to a private key. The involvement of many parties requires Distributed key generation to ensure secrecy in the presence of malicious contributions to the key calculation.〔
Distributed Key Generation is commonly used to decrypt shared ciphertexts or create group digital signatures.〔
==History==
Distributed key generation protocol was first specified by Torben Pedersen in 1991. This first model depended on the security of the Joint-Feldman Protocol for verifiable secret sharing during the secret sharing process.
In 1999, Rosario Gennaro, Stanislaw Jarecki, Hugo Krawczyk, and Tal Rabin produced a series of security proofs demonstrating that Feldman verifiable secret sharing was vulnerable to malicious contributions to Pedersen's distributed key generator that would leak information about the shared private key. The same group also proposed an updated distributed key generation scheme preventing malicious contributions from impacting the value of the private key.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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