A. Sahai

Publications278
h-index80
Citations39,265
Highly Influential Citations4,012
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Ciphertext-Policy Attribute-Based Encryption
TLDR
A system for realizing complex access control on encrypted data that is conceptually closer to traditional access control methods such as role-based access control (RBAC) and secure against collusion attacks is presented. Expand
Fuzzy Identity-Based Encryption
TLDR
Two constructions of Fuzzy IBE schemes can be viewed as an Identity-Based Encryption of a message under several attributes that compose a (fuzzy) identity and are both error-tolerant and secure against collusion attacks. Expand
Attribute-based encryption for fine-grained access control of encrypted data
TLDR
This work develops a new cryptosystem for fine-grained sharing of encrypted data that is compatible with Hierarchical Identity-Based Encryption (HIBE), and demonstrates the applicability of the construction to sharing of audit-log information and broadcast encryption. Expand
Predicate Encryption Supporting Disjunctions, Polynomial Equations, and Inner Products
TLDR
A scheme for predicates corresponding to the evaluation of inner products over ℤN (for some large integer N) is constructed, which enables constructions in which predicates correspond to the Evaluation of disjunctions, polynomials, CNF/DNF formulas, thresholds, and more. Expand
On the (Im)possibility of Obfuscating Programs
TLDR
It is proved that obfuscation is impossible, by constructing a family of functions F that are inherently unobfuscatable in the following sense: there is a property π : F → {0, 1} such that given any program that computes a function f ∈ F, the value π(f) can be efficiently computed. Expand
Efficient Non-interactive Proof Systems for Bilinear Groups
TLDR
The goal of this paper is to spread the use of non-interactive cryptographic proofs from mainly theoretical purposes to the large class of practical cryptographic protocols based on bilinear groups. Expand
Fully Secure Functional Encryption: Attribute-Based Encryption and (Hierarchical) Inner Product Encryption
We present two fully secure functional encryption schemes: a fully secure attribute-based encryption (ABE) scheme and a fully secure (attribute-hiding) predicate encryption (PE) scheme for… Expand
Homomorphic Encryption from Learning with Errors: Conceptually-Simpler, Asymptotically-Faster, Attribute-Based
TLDR
In this work, a comparatively simple fully homomorphic encryption (FHE) scheme based on the learning with errors (LWE) problem is described, with a new technique for building FHE schemes called the approximate eigenvector method. Expand
Private Circuits: Securing Hardware against Probing Attacks
TLDR
This paper proposes several efficient techniques for building private circuits resisting side channel attacks, and provides a formal threat model and proofs of security for their constructions. Expand
Universally composable two-party and multi-party secure computation
TLDR
It is shown how to securely realize any multi-party functionality in a universally composable way, regardless of the number of corrupted participants, which implies that security is preserved under concurrent composition of an unbounded number of protocol executions. Expand
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