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Homomorphic data decryption method and apparatus for implementing privacy protection

專利號(hào)
US11159305B2
公開日期
2021-10-26
申請(qǐng)人
Advanced New Technologies Co., Ltd.（KY Grand Cayman）
發(fā)明人
Shuai Han; Zhangjie Huang; Huanyu Ma; Hao Lei
IPC分類
H04L29/06; H04L9/00; H04L9/30; H04L9/06
技術(shù)領(lǐng)域
ciphertext,mod,hn,blockchain,n2,qrn,user,group,encryption,key
地域： George Town

摘要

A computer-implemented method, non-transitory, computer-readable medium, and computer-implemented system are provided for implementing privacy protection. In an implementation, a public key pk={N, h} corresponding to a target user is obtained, where h is a generator of a predetermined cyclic group with a size of k in a random number space Z*N, a length of k is i bits, a length of N is n bits, and i<

說明書

According to a fourth aspect of the one or more implementations of the present specification, a homomorphic data decryption apparatus for implementing privacy protection is provided, and includes the following: a ciphertext acquisition unit, configured to obtain homomorphic ciphertext c=(1+N)m·(hr mod N)N=(1+N)m·(hN mod N2)r mod N2, where homomorphic ciphertext c is obtained after data m is processed by using public key pk={N, h} corresponding to a target user and random number r, h is a generator of a predetermined cyclic group with a size of k in random number space Z*N, hr belongs to the predetermined cyclic group, a length of k is i bits, a length of N is n bits, and i<<n; a ciphertext decryption unit, configured to decrypt homomorphic ciphertext c based on private key sk of the target user, to obtain data

m = c k ? mod ? ? N 2 - 1 N · k - 1 ? mod ? ? N

權(quán)利要求

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