We construct the first (key-policy) attribute-based encryption (ABE) system with short secret
keys: the size of keys in our system depends only on the depth of the policy circuit, not its …

In this work, we propose a variant of functional encryption called projective arithmetic
functional encryption (PAFE). Roughly speaking, our notion is like functional encryption for …

A group signature allows a group member to anonymously sign messages on behalf of the
group. In the past few years, new group signatures based on lattice problems have …

Big data and artificial intelligence develop rapidly. Big data analysis has been applied in
many fields of smart healthcare. Once these data are leaked or modified during …

In e-healthcare record systems (EHRS), attribute-based encryption (ABE) appears as a
natural way to achieve fine-grained access control on health records. Some proposals …

Applying access structure to encrypted sensitive data is one of the challenges in
communication networks and cloud computing. Various methods have been proposed to …

The advent of new cryptographic methods in recent years also includes schemes related to
functional encryption. Within these schemes Attribute-based Encryption (ABE) became the …

As we enter into the post-quantum era, traditional public-key cryptosystems face great
challenges and will fail to protect our private information over the Internet. Due to several …

Attribute-Based Encryption (ABE) schemes show unprecedented flexibility and
expressiveness through the introduction of access policies. Compared to ABE schemes for …

Abstract Regev's Learning with Errors (LWE) problem (STOC 2005) is a fundamental
hardness assumption for modern cryptography. The Learning with Rounding (LWR) …