講座名稱：Result-pattern-hiding Conjunctive Searchable Symmetric Encryption with Forward and Backward Privacy

講座人：左聰 副教授

講座時間：5月21日15:00-16:30

地點：騰訊會議：616-9016-7251

講座人介紹：

左聰，獲南京工程學(xué)院計算機工程學(xué)院學(xué)士學(xué)位，浙江工商大學(xué)計算機科學(xué)與技術(shù)學(xué)院碩士學(xué)位。2020年獲得莫納什大學(xué)博士學(xué)位?，F(xiàn)任北京理工大學(xué)網(wǎng)絡(luò)空間安全學(xué)院準(zhǔn)聘教授。在加入北京理工大學(xué)之前，他是南洋理工大學(xué)博士后。主要研究方向是網(wǎng)絡(luò)安全，特別是數(shù)據(jù)庫安全和應(yīng)用密碼學(xué)。

講座內(nèi)容：

Dynamic searchable symmetric encryption (DSSE) enables the data owner to outsource its database (document sets) to an untrusted server and make searches and updates securely and efficiently. Conjunctive DSSE can process conjunctive queries that return the documents containing multiple keywords. However, a conjunctive search could leak the keyword pair result pattern (KPRP), where attackers can learn which documents contain any two keywords involved in the query. File-injection attack shows that KPRP can be utilized to recover searched keywords. To protect data effectively, DSSE should also achieve forward privacy, i.e., hides the link between updates to previous searches, and backward privacy, i.e., prevents deleted entries being accessed by subsequent searches. Otherwise, the attacker could recover updated/searched keywords and records. However, no conjunctive DSSE scheme in the literature can hide KPRP in sub-linear search efficiency while guaranteeing forward and backward privacy.

主辦單位：資源保障部