Secure Blockchain Transactions for Electronic Health Records based on an Improved Attribute-Based Signature Scheme (IASS)

An efficient secure channel coding scheme based on polar codes

In this paper, we propose a new framework for joint encryption encoding scheme based on polar codes, namely efficient and secure joint secret key encryption channel coding scheme. The issue of using new coding structure, i.e. polar codes in Rao-Nam (RN) like schemes is addressed. Cryptanalysis methods show that the proposed scheme has an acceptable level of security with a relatively smaller ke...

Secure Anonymous Signature-Based Transactions

Attribute Based Group Signature Scheme

Alice needs a document signed by an employee in Bob’s company. That employee should be part of the IT staff and is at least a junior manager in the cryptography team or a senior manager in the biometrics team. In such a scenario we need an Attribute Based Group Signature Scheme (ABGS). In this paper we define the first ABGS scheme where verifying includes authenticating a person that belongs to...

Attribute-based Access Control for Cloud-based Electronic Health Record (EHR) Systems

Electronic health record (EHR) system facilitates integrating patients' medical information and improves service productivity. However, user access to patient data in a privacy-preserving manner is still challenging problem. Many studies concerned with security and privacy in EHR systems. Rezaeibagha and Mu [1] have proposed a hybrid architecture for privacy-preserving accessing patient records...

An Improved Threshold Proxy Signature Scheme Based on RSA

This paper proposes an improved RSA-based threshold proxy signature scheme. The proposed scheme satisfies the necessary security requirements of proxy signature such as verifiability, unforgeability, threshold property and identifiability. The proposed scheme does not require any secure channel to deliver the proxy keys any more. Introduction A proxy signature scheme involves three entities: an...