access policy

Protecting sensitive data is crucial in various fields, including Information Technologies, Network Security, and healthcare records. Implementing precise access policies for encrypted data is vital in large networks. Attribute-Based Encryption (ABE) emerges as a solution to this challenge, enabling encryption and access control simultaneously. With the increasing significance of quantum-safe measures due to advancements in quantum computing, there is a growing need for quantum-resistant access control mechanisms for encrypted data, as addressed by Lattice-Based Attribute-Based Encryption.However, some existing Lattice-Based ABE schemes lack robust support for fine-grained access policies. In this paper, we present an enhancement to a Key Policy Attribute-Based Encryption (ABE) scheme to not only accommodate threshold gates but also any boolean circuits. Our proposed scheme's security is grounded in the Learning with Errors (LWE) assumption within the selective security model under the Indistinguishable CPA game. Importantly, the scheme is well-suited for the Disjunctive Normal Form (DNF) representation of boolean functions, offering enhanced flexibility and security in access control mechanisms for encrypted data.

Applying access control to encrypted data is a crucial aspect of network security. Although Attribute-Based Encryption (ABE) provides a suitable solution, it comes with limitations, primarily its high computational complexity due to the use of pairing operations. In this paper, we propose the first attribute-based encryption scheme based on RSA encryption, which is pairing-free and more efficient than previous pairing-based approaches. This scheme is particularly well-suited for lightweight applications such as those in the Internet of Things (IoT).
The proposed encryption scheme is a Key-Policy Attribute-Based Encryption (KP-ABE) that allows its access policy to be any Boolean function in disjunctive normal form (DNF). Our scheme also addresses the challenge of key revocation, which is often problematic in ABE schemes. The key advantages of our scheme are its efficiency and simplicity compared to other ABE schemes, which typically rely on complex pairing operations. Additionally, we present an Attribute-Based Signature (ABS) scheme based on RSA.