As COVID-19 continues to spread around the world, healthcare industry has accelerated transformation digital services. In era of big data, many hospitals prefer use remote cloud servers store and manage massive electronic medical data. However, cloud-assisted data systems cannot guarantee confidentiality, integrity, availability Searchable encryption can effectively address above challenges by ...

We consider Symmetric Searchable Encryption with Sharing and Unsharing (SSEwSU), a notion thatmodels Symmetric Searchable Encryption (SSE) in a multi-user setting in which documents can bedynamically shared and unshared among users. Previous works on SSE involving multiple users haveassumed that all users have access to the same set of documents and/or their security models assume<l...

Attribute Based Encryption (ABE) is a promising public-key cryptographic primitive that can be used for cryptographically enforced access control in untrusted storage. Storing data on untrusted storage not only requires data security for data owners but also poses data protection from untrusted storage server. To address this important requirement, Anonymous Attribute Based Encryption (AABE) is...

Outsourcing data storage is a topic of emerging importance in database security. Inthis paper, we consider exact-match query functionality in the public-key setting. Solutionsproposed in the database community lack clarity and proofs of security, while encryption-with-keyword-search schemes from the cryptographic community require linear search time(in database size) for each qu...

Dynamic Searchable Symmetric Encryption (DSSE) enables a client to encrypt his document collection in a way that it is still searchable and efficiently updatable. However, all DSSE constructions that have been presented in the literature so far come with several problems: Either they leak a significant amount of information (e.g., hashes of the keywords contained in the updated document) or are...