For searchable symmetric encryption schemes (or symmetrickey encryption with keyword search), the security against passive adversaries (i.e. privacy) has been mainly considered so far. In this paper, we first define its security against active adversaries (i.e. reliability as well as privacy). We next formulate its UC-security. We then prove that the UCsecurity against non-adaptive adversaries ...

Outsourcing data to the cloud is becoming increasingly prevalent. To ensure data confidentiality, encrypting the data before outsourcing it is advised. While encryption protects the secrets in the data, it also prevents operations on the data. For example in a multi-user setting, data is often accessed via search, but encryption prevents search. Searchable encryption solves this dilemma. Howeve...

In the first part of this report we present a survey of the state of the art in searchable encryption and its relevance for cloud computing. In particular we focus on the OpenStack open-source cloud platform and investigate which searchable encryption schemes are more amenable for adoption in conjunction with platforms based on OpenStack. Based on that survey we chose one of the schemes to impl...

Boneh, Raghunathan, and Segev (CRYPTO ’13) have recently put forward the notion of function privacy and applied it to identity-based encryption, motivated by the need for providing predicate privacy in public-key searchable encryption. Intuitively, their notion asks that decryption keys reveal essentially no information on their corresponding identities, beyond the absolute minimum necessary. W...

Searchable encryption allows an encrypter to send a message, in an encrypted form, to a decryptor who can delegate to a third party to search the encrypted message for keywords without losing encrypted message content’s privacy. In this paper, based on the bilinear pairings, we propose a new efficient searchable encryption scheme, and use the provable security technique to formally prove its se...

Cloud computing is very popular for its computing and storage capacity at lower cost. More and more data are being moved to the cloud to reduce storage cost. On the other hand, since the cloud is not fully trustable, in order to protect data privacy against third-parties and even the cloud server, they are usually encrypted before uploading. However, many operations, such as searching, are hard...