Blockchain for Secure Authentication in Online Services

Objective:

To develop a decentralized authentication system leveraging blockchain technology, enhancing security, privacy, and user control over digital identities in online services.

Key Features:

Decentralized Identity Management:
Utilizes blockchain to create and manage digital identities without relying on central authorities. 

Passwordless Authentication:
Employs cryptographic methods like public-private key pairs and biometric verification for secure access. 

Immutable Access Logs:
Records all authentication attempts on the blockchain, ensuring transparency and accountability. 

Enhanced Privacy:
Users maintain control over their personal data, sharing only necessary information during authentication.

Technologies Used:

Blockchain Platforms:
Hyperledger Fabric, Ethereum, or custom blockchain solutions for decentralized identity management.

Cryptographic Techniques:
Public-key cryptography, digital signatures, and Zero-Knowledge Proofs (ZKPs) for secure authentication.

Biometric Systems:
Integration of facial recognition or fingerprint scanning for biometric verification.

Web and Mobile Frameworks:
React.js, Next.js, Spring Boot, and Java for frontend and backend development 

Databases:
PostgreSQL or H2 for storing user data and authentication logs.

How It Works:

User Registration:
Users create a digital identity by generating a public-private key pair and registering their credentials on the blockchain.

Authentication Request:
Upon attempting to access an online service, users submit a request containing their public key and a digital signature created with their private key.

Verification Process:
The service verifies the digital signature using the user's public key and checks the blockchain to validate the user's credentials.

Access Decision:
If both verifications are successful, access is granted; otherwise, the request is denied.

Transaction Recording:
Each authentication attempt is recorded on the blockchain, creating a transparent and immutable log.

Benefits:

Enhanced Security:
Blockchain's cryptographic encryption ensures tamper-proof data, providing robust protection against unauthorized access. 

Decentralization:
Eliminates single points of failure, reducing vulnerabilities in authentication systems. 

Privacy Protection:
Allows users to control and share only essential data, ensuring sensitive information remains private 

Reduced Fraud:
Transparent and immutable records minimize the risk of identity theft and fraudulent transactions. 

Cost Efficiency:
Reduces reliance on intermediaries, cutting down operational costs and streamlining processes. 

Interoperability:
Enhances compatibility, allowing seamless interactions across various platforms.