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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

FIG. 5 is a schematic interaction diagram illustrating a multi-party computation scenario, according to an example implementation. As shown in FIG. 5, user Ua and user Ub are still used as examples. User Ua corresponds to public and private key pair (pk_0, sk_0), and user Ub corresponds to public and private key pair (pk_1, sk_1). An interaction process between the two users can include the following steps.

Step 502: User Ua encrypts data m0 to ms into homomorphic ciphertext c0 to cs.

User Ua performs homomorphic encryption processing on data m0 to ms based on the implementation shown in FIG. 1 by using public key pk_0 corresponding to user Ua, to generate corresponding homomorphic ciphertext c0 to cs. A specific calculation equation and an encryption process are omitted here for simplicity.

Step 504: User Ua sends homomorphic ciphertext c0 to cs to user Ub.

User Ua sends only homomorphic ciphertext c0 to cs to user Ub, and does not need to send raw plaintext data m0 to ms, and user Ub does not hold private key sk_0 corresponding to public key pk_0 used for encryption, and therefore data m0 to ms is not exposed to user Ub.

Step 506: User Ub processes homomorphic ciphertext c0 to cs by using model parameters d0 to ds.

Step 508: User Ub returns ciphertext processing result c_f to user Ua.

權(quán)利要求

1
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