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Homomorphic data decryption method and apparatus for implementing privacy protection

專(zhuān)利號(hào)
US11159305B2
公開(kāi)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(lèi)
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(shuō)明書(shū)

The value of α is used as private key sk, and therefore it needs to ensure that the value of α cannot be obtained or is difficult to obtain, to ensure security of α. As described above, number N included in the public key is the product of prime numbers P and Q, and the values of prime numbers P and Q are difficult to obtain. Therefore, a can be calculated based on the values of prime numbers P and Q. For example, intermediate parameters p and q can be used. Intermediate parameters p and q are prime numbers, p|P?1, and q|Q?1 (in other words, p is divisible by P?1, and q is divisible by Q?1). In this case, α=pq can be set. In addition, β=(P?1)(Q?1)/(4pq) can be set, and gcd(α, β)=1 is satisfied. In this case, α·β=(P?1)(Q?1)/4=|QRN| can be determined. It can be seen that |QRNα|=β with reference to |QRNα||QRNβ|=|QRN| and |QRNβ|=α.

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