报告题目：Functional Encryption for Attribute-Weighted Sums from k-Lin
时间：2021-05-06 (星期四) 09:30 ~ 2021-05-06 (星期四) 11:30
地点：腾讯会议室（ID：632893539）
主讲：华东师范大学研究员巩俊卿
主办：数学与信息学院, 福建省网络安全与密码技术重点实验室
参加对象：感兴趣的教师和学生
报告摘要：This talk will present functional encryption schemes for attribute-weighted sums: encryption takes as input N attribute-value pairs (xi,zi) where xi is public and zi is private; secret keys are associated with arithmetic branching programs f; decryption returns the weighted sum \sum f(xi) zi while leaking no additional information about all private inputs zi. Our main construction achieves: (1) compact public parameters and key sizes that are independent of N and the secret key can decrypt a ciphertext for any a-priori unbounded N; (2) short ciphertexts that grow with N and the size of zi but not xi; (3) simulation-based security against unbounded collusions under standard k-linear assumption in prime-order bilinear groups.
The talk is based on the joint work with Michel Abdalla and Hoeteck Wee.
Link: https://eprint.iacr.org/2020/762
报告人简介：Junqing Gong is a researcher of East China Normal University (ECNU). Before that, he was a postdoc researcher of CNRS, ENS and PSL. Before that, he was a postdoc researcher at ENS de Lyon. He obtained his Ph.D. from Shanghai Jiao Tong University in 2016. His research interest is public-key cryptography, in particular, design and analysis of practical functional encryptions.