公开(公告)号：US20170359177A1

公开(公告)日：2017-12-14

申请号：US15542211

申请日：2015-02-13

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Yan ZHU ,  Ruyun YU ,  Ruiqi GUO ,  Xin WANG

IPC: H04L9/30 ,  H04L9/06

CPC classification number: H04L9/3026 ,  H04L9/0643 ,  H04L9/3033 ,  H04L9/3218

Abstract: A cryptographic decision-making of set membership is a method or system which make a secure decision-making for positive membership e∈S or negative membership e∉S in an unforgeable and non-repudiation way for any element e and a set S. The proposed method of the present invention comprises: acquire a set U={e1, . . . , en} and map each element ei in U into a random point vi in a cryptography space; acquire a set S={e′1, . . . , e′m}⊂U, determine a random point v′i corresponding to each element e′i in the set S, and construct a function ƒS(x) according to all random points v′i; introduce a random secret γ to generate ƒS(γ) by using the function ƒS(x), and produce a public parameter mpk according to the random secret γ; and generate the cryptographic representation of set S by using the function ƒS(γ) and the public parameter mpk. In the embodiments, we provide two kinds of cryptographic representations of set, including Poles-based Aggregation and Zeros-based Aggregation, to make the decision on positive membership ei∈S and negative membership ei∉S.

公开(公告)号：US20180006811A1

公开(公告)日：2018-01-04

申请号：US15543223

申请日：2015-11-05

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Yan ZHU ,  Feng PU ,  Ruyun YU ,  Dandan LI

IPC: H04L9/08 ,  H04L9/14 ,  H04L29/06 ,  H04L12/18

CPC classification number: H04L9/0833 ,  H04L9/14 ,  H04L12/18 ,  H04L29/06 ,  H04L63/0442 ,  H04L63/065 ,  H04L2209/601

Abstract: A method and system for group-oriented encryption and decryption that supports the implementation of the designation and revocation functions of decryption users in a large-scale group. During the encryption, the system acquires a corresponding aggregate function according to an encryption mode; acquires any selected subset S and public parameters, and outputs an aggregate value of the subset S; generates a ciphertext of to-be-transmitted information according to the public parameters, a to-be-transmitted message and the aggregate value; acquires the encryption mode and the subset S comprised in the received ciphertext, operates the subset S and an identity of a current decryptor according to the encryption mode, and outputs a new subset S′; acquires an aggregate function corresponding to the encryption mode during the decryption; outputs an aggregate value of the new subset S′; and decrypts the received ciphertext according to the public parameters and the aggregate value, so as to obtain the to-be-transmitted information.