Multi-User Searchable Encryption in the Cloud. Cédric Van Rompay, Refik Molva, and Melek Önen ISC 2015 September 10, 2015 Trondheim, Norway
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1 Multi-User Searchable Encryption in the Cloud Cédric Van Rompay, Refik Molva, and Melek Önen ISC 2015 th September 10, 2015 Trondheim, Norway
2 Outline Searchable Encryption Multi-User Scenarios State of the Art Privacy Issue Challenge Solution Conclusion Cédric Van Rompay slide 2
3 Searchable Encryption Data upload Cédric Van Rompay slide 3
4 Searchable Encryption Data upload Honest-but-curious Cloud Cédric Van Rompay slide 4
5 Searchable Encryption Data upload Honest-but-curious Cloud Encryption for Privacy Cédric Van Rompay slide 5
6 Searchable Encryption Data upload Honest-but-curious Cloud Encryption for Privacy Remote word search queries Cédric Van Rompay slide 6
7 Multi-User Scenarios - PEKS Single Reader Multiple Writers Cédric Van Rompay slide 7
8 Multi-User Scenarios Delegated SE Multiple Readers Single Reader Cédric Van Rompay slide 8
9 Multi-User Scenarios MUSE Multiple Readers Multiple Writers + Search Scalability Cédric Van Rompay slide 9
10 State of the Art for MUSE [Bao2008], [Yang2011], [Popa2014] Scalability through query transformation Cédric Van Rompay slide 10
11 State of the Art for MUSE [Bao2008], [Yang2011], [Popa2014] Scalability through query transformation Data Privacy Cédric Van Rompay slide 11
12 State of the Art for MUSE [Bao2008], [Yang2011], [Popa2014] Scalability through query transformation Data Privacy Search Pattern Privacy (query indistinguishability) Cédric Van Rompay slide 12
13 State of the Art for MUSE [Bao2008], [Yang2011], [Popa2014] Scalability through query transformation Data Privacy Search Pattern Privacy (query indistinguishability) No Access Pattern Privacy (result privacy) Privacy Issue if collusions Cédric Van Rompay slide 13
14 Privacy Issue Cédric Van Rompay slide 14
15 Privacy Issue Access Pattern Similarities Cédric Van Rompay slide 15
16 Privacy Issue Access Pattern Similarities Collusion Data leakage Cédric Van Rompay slide 16
17 Privacy Issue Access Pattern Similarities Collusion Data leakage Privacy Breach: Data Privacy Broken Search Privacy Broken Cédric Van Rompay slide 17
18 Challenge Access Pattern Similarities Collusion Data leakage Privacy Breach: Data Privacy Broken Search Privacy Broken New Adversary Model Cédric Van Rompay slide 18
19 Idea of Solution Private Information Retrieval (PIR) for Privacy Cédric Van Rompay slide 19
20 Idea of Solution Private Information Retrieval (PIR) for Privacy Query Transformation through Proxy Proxy Cédric Van Rompay slide 20
21 Idea of Solution Private Information Retrieval (PIR) for Privacy Query Transformation through Proxy Proxy not Trusted Single Assumption: No collusion between Proxy and Cloud Cédric Van Rompay slide 21
22 Protocol Description Encrypted words upload Cédric Van Rompay slide 22
23 Protocol Description Encrypted words upload Authorization Cédric Van Rompay slide 23
24 Protocol Description Encrypted words upload Authorization Querying Cédric Van Rompay slide 24
25 Protocol Description Encrypted words upload Authorization Querying Query Transformation with bilinear pairings Cédric Van Rompay slide 25
26 Protocol Description Encrypted words upload Authorization Querying Query Transformation with bilinear pairings PIR Querying Cédric Van Rompay slide 26
27 Protocol Description Encrypted words upload Authorization Querying Query Transformation with bilinear pairings PIR Querying (Cheap) PIR Processing Cédric Van Rompay slide 27
28 Protocol Description Encrypted words upload Authorization Querying Query Transformation with bilinear pairings PIR Querying (Cheap) PIR Processing PIR Response Cédric Van Rompay slide 28
29 Achievements Scalable Search New Adv. Model Privacy in new model Access Pattern Privacy Safe against collusion Cédric Van Rompay slide 29
30 Conclusion Multi-User Searchable Encryption with: Extended Adversary Model: Collusions among Cloud (resp. Proxy) and any number of (non authorized) users. Privacy Properties: Data Privacy, Search Pattern Privacy, Access Pattern Privacy Proved external Diffie-Hellman (XDH), PIR Security (IND-CCA2), Random Oracle Model Cédric Van Rompay slide 30
31 Questions? Cédric Van Rompay slide 31
32 References [Bao2008] Bao, F., Deng, R.H., Ding, X., Yang, Y.: Private query on encrypted data in multi-user settings. In: Information Security Practice and Experience, pp Springer (2008) [Yang2011] Yang, Yanjiang, Haibing Lu, and Jian Weng. "Multi-user private keyword search for cloud computing." Cloud Computing Technology and Science (CloudCom), 2011 IEEE Third International Conference on. IEEE, [Popa2014] Popa, R.A., Zeldovich, N.: Multi-Key Searchable Encryption (2013), Cédric Van Rompay slide 32
33 Privacy Definitions Games Cédric Van Rompay slide 33
34 Privacy Definitions Games Cédric Van Rompay slide 34
35 Transition Game 0 1 Cédric Van Rompay slide 35
36 Transition Game 2 3 Cédric Van Rompay slide 36
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