13538

12328

كارشناسي ارشد

نرم افزار

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

۱۳۹۶

دوازده، ۹۵ص.: مصور، جدول

علي فانيان

محمد دخيل عليان، محمد حسين منشئي

1397/02/26

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID12328

Multi keyword and Multi user SearchableEncryption based on Vector Space Model in Data Outsourcing Samaneh Kazemfarzandi s kazemfarzandi@ec iut ac ir April 2018 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Prof Ali Fanian a fanian@cc iut ac ir Abstract Nowadays data outsourcing are developing and data owners are motivated to outsource their data to cloud server for greatconvenience and reduce cost in data management Despite of owner s interest to data outsourcing after storing sensitiveinformation in remote server they are concern about data privacy To ensure data confidentiality encrypting the data beforeoutsourcing it is advised While encryption protects the secrets in the data it also prevents operations on the data such ascommon data retrieval approach for search Therefore search over encrypted data is a hot research field that called SearchableEncryption Efficient searchable encryption schemes with multi keyword ranked search are proposed but most of themare limited to single user setting Another field of research in Data outsourcing is Access control Searchable encryptionscheme becomes more challenging when users have different access rights in system which called multi user system Ina multi user setting each user allowed to access a part of data that define in access control policy Due to the fact that thecloud server is not trusted the user access pattern don t send to server Most of the existion scheme are limited to searchableencryption or access control but a practical scheme that search on encrypted data with regarding to user access control thathide from sever is not proposed To solve the problem of multi user searchable some scheme have been proposed that mostof them are single keyword and access pattern don t hide from servers SE scheme are more efficient when the files can beretrieved if the user has access to it In this thesis for the first time we propose a multi user and multi keyword searchableencryption scheme which server can understand minimum information about user s access pattern to documents We designtwo schemes for combining searchable encryption and access one is multi user and multi keyword searchable encryptionwith one server and coarse grain access control and the other is multi user and multi keyword searchable encryption withtow server and fine grain access control which hides access control from servers Security analysis shows that our schemeis secure Key Words Data Outsourcing Searchable Encryption Multi user System Access Control Multi keyword Search Vector Space Model

علي فانيان

محمد دخيل عليان، محمد حسين منشئي