JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2023, Vol. 58 ›› Issue (9): 16-27.doi: 10.6040/j.issn.1671-9352.0.2022.154

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Time-controlled designated tester proxy re-encryption with keyword search scheme

Jiao LYU1(),Xi ZHANG1,Jing QIN1,2,*()   

  1. 1. School of Mathematics, Shandong University, Jinan 250100, Shandong, China
    2. State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China
  • Received:2022-03-16 Online:2023-09-20 Published:2023-09-08
  • Contact: Jing QIN E-mail:lvjiao@mail.sdu.edu.cn;qinjing@sdu.edu.cn

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Abstract:

To solve the problem that the proxy re-encryption with keyword search is used to implement ciphertext data exchange and sharing, but it does not support time-controlled access authorization and cannot resist off-line keyword guessing attack, a time-controlled designated tester proxy re-encryption with keyword search scheme is proposed, which supports the data owner to grant dynamically the search and decryption rights of the ciphertext data in the cloud to the data user within a specified time range, and can resist the off-line keyword guessing attack by external adversaries. In addition, the scheme is applied to the scenario of sharing patients electronic medical records between different hospitals, and a specific electronic medical records sharing scheme is designed based on the consortium blockchain.

Key words: proxy re-encryption with keyword search, time control, off-line keyword guessing attack, data sharing

CLC Number: 

  • TP309.7

Fig.1

Blockchain data structure"

Fig.2

Model of tc-dPRES"

Table 1

Comparisons of functionality"

特征 Yang等方案[21] Shao等方案[1] Fang等方案[11] 本文提出的方案
外部离线KGA √ × × √
时间可控授权 √ × × √
搜索授权 √ √ × √
解密授权 × √ √ √

Table 2

Computational overhead comparison"

算法 Shao等方案[1] 本文提出的方案
Enc 5te+2tp+ts 5te+2tp+ts
ReEnc te+4tp+tv 5te+4tp+tv
Trapdoor te 4te
Test 5tp+tv 2te+3tp
Dec te+5tp+tv te+tp

Table 3

Communication overhead comparison"

算法 Shao等方案[1] 本文提出的方案
Enc |svk|+3|G1|+2|G2|+|σ| |svk|+3|G1|+2|G2|+|σ|
ReKeyGen |Zp* | |Zp* |
ReEnc |svk|+3|G1|+2|G2|+|σ| |svk|+6|G1|+2|G2|+|σ|
Timetoken — |G1|+|Zp* |
Trapdoor |G1| 3|G1|+|Zp* |

Fig.3

Electronic medical record sharing model"

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