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Title:
ONE-WAY PROXY RE-ENCRYPTION METHOD AND APPARATUS, AND ELECTRONIC DEVICE AND SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/120699
Kind Code:
A1
Abstract:
A one-way proxy re-encryption method and apparatus, and an electronic device and a system, which relate to the technical field of proxy re-encryption. The method comprises: acquiring a first private key and plaintext data (S11); generating a first ciphertext (S12) on the basis of the first private key and the plaintext data, wherein the first ciphertext comprises a plurality of ciphertext parameters; generating a re-encryption key according to the first private key and preset ciphertext parameters in the first ciphertext (S13); and sending the first ciphertext and the re-encryption key to an agent party, such that the agent party converts, by using the re-encryption key, the first ciphertext into a second ciphertext under a second public key of an authorized party (S14). By means of a re-encryption key, a first ciphertext of an authorizing party can only be converted into a second ciphertext of an authorized party, and a first ciphertext of the authorized party cannot be converted into a second ciphertext of the authorizing party, thereby realizing one-way re-encryption; and when plaintext data changes, each ciphertext parameter also changes accordingly, and when under a collusion attack, no additional plaintext is exposed, thereby ensuring a strong capability to resist collusion attacks.

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Inventors:
WEI JIAQUAN (CN)
ZHANG PENG (CN)
LIU HONGWEI (CN)
Application Number:
PCT/CN2020/135204
Publication Date:
June 16, 2022
Filing Date:
December 10, 2020
Export Citation:
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Assignee:
UNIV SHENZHEN (CN)
International Classes:
H04L29/06
Foreign References:
CN110310117A2019-10-08
CN103888249A2014-06-25
CN110505233A2019-11-26
CN110635909A2019-12-31
US20140098960A12014-04-10
Attorney, Agent or Firm:
SUNSHINE INTELLECTUAL PROPERTY INTERNATIONAL CO., LTD. (CN)
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