Journal of Nonlinear Analysis and Optimization Vol. 15, Issue. 1, No.18 : 2024 ISSN : 1906-9685 MULTI AUTHORITY ATTRIBUTE BASED ENCRYPTION WITH USER PRIVACY AND ANONYMITY Prabhadevi Cheruku Research Scholar, Department of Computer Science and Engineering, University College of Engineering (A), Osmania University, Hyderabad. Dr. V. B. Narasimha Asst. Prof., Department of Computer Science and Engineering, University College of Engineering, Osmania University, Hyderabad. 1 dasariprabhadevi@gmail.com, 2 vbnarasimha@gmail.com Abstract Attribute-Based Encryption (ABE) is an advanced cryptographic technique that secures data by leveraging user attributes rather than conventional cryptographic keys. Expanding upon this, Multi- Authority Attribute-Based Encryption (MA-ABE) introduces multiple governing bodies, each managing distinct sets of attributes, to enhance flexibility and control in large-scale systems. The primary objective of this research is to address the challenges of privacy, anonymity, and access control in Identity and Access Management (IAM) through a novel MA-ABE framework. This study fills a critical gap in the current literature by providing a decentralized solution that effectively distributes authority and integrates advanced cryptographic techniques to safeguard sensitive data against unauthorized access and malicious attacks. The methodology employed integrates Elliptic Curve Cryptography (ECC) and the Elliptic Curve Diffie-Hellman (ECDH) key exchange for secure key generation and sharing. A novel approach for signing data with temporal context is introduced, utilizing Digital Signature Standard (DSS) with timestamping to enhance data integrity and authentication. The proposed model also incorporates Advanced Encryption Standard (AES) in EAX mode to ensure data confidentiality and integrity during encryption and decryption processes. The integration of these algorithms within a decentralized MA-ABE framework represents a significant advancement in the field of cryptographic systems for IAM. The findings demonstrate that the proposed MA-ABE system effectively maintains data security, user privacy, and anonymity. The experimental results show robust performance in handling dynamic access scenarios, enforcing strict access control, and preserving user anonymity without compromising system efficiency. Keywords: Multi-Authority Attribute-Based Encryption, Identity and Access Management, User Privacy, Anonymity, Elliptic Curve Cryptography, Advanced Encryption Standard 1. Introduction Attribute Based Encryption (ABE) is a fundamental component of contemporary cryptographic systems, providing a sophisticated method for safeguarding data by using qualities instead of conventional cryptographic keys [1]. It allows access restriction based on user qualities, such as age, role, or department affiliation, rather than just the user's identity or the material itself [2]. This novel paradigm not only improves flexibility in managing access but also promotes data security in dynamic contexts where access privileges differ across individuals and resources [3]. With the addition of several authorities to the encryption process, Multi Authority Attribute Based Encryption (MA-ABE) expands the capability of conventional ABE frameworks. Every governing body has power over a certain range of characteristics, which enables more detailed management of access regulations and improves the capacity to handle large-scale systems. The goal of MA-ABE is to tackle the intricacies of access management in diverse contexts by facilitating effective cooperation among numerous authorities while safeguarding the confidentiality and integrity of sensitive data [4].