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Hybrid encryption-based file storage system

Why Choose This Project?

Data security in cloud storage is a major concern. Hybrid encryption (combining symmetric encryption for speed and asymmetric encryption for secure key exchange) provides a strong balance between performance and security. This project ensures that sensitive files stored in the cloud are protected with multiple layers of cryptographic mechanisms, making it ideal for students exploring cloud security, cryptography, and secure storage solutions.

What You Get

Secure file upload and retrieval system
Hybrid encryption using AES (symmetric) + RSA (asymmetric)
Encrypted file storage in the cloud
Key management system for encryption/decryption
User authentication and access control
Web dashboard for file management
Logs of file access for auditing

Key Features

Feature	Description
Hybrid Encryption	Encrypt files using AES for speed; secure AES keys with RSA public/private key pairs.
Secure File Upload	Files are encrypted before being stored in the cloud.
User Authentication	Role-based login using IAM or JWT for secure access.
Cloud Storage	Store encrypted files in S3, Azure Blob, or GCP Cloud Storage.
Key Management	Manage encryption keys securely using AWS KMS / custom key vault.
Decryption on Demand	Files are decrypted only when an authorized user requests them.
Access Logs	Track who uploaded, accessed, or downloaded files.
Scalability	Handle multiple users and large files with efficient storage.

Technology Stack

Layer	Tools/Technologies
Frontend	HTML, CSS, JavaScript, React/Angular
Backend	Node.js / Spring Boot / Django
Encryption	AES-256 (symmetric), RSA-2048 (asymmetric)
Key Management	AWS KMS / HashiCorp Vault / Custom Key Service
Storage	AWS S3 / Azure Blob / GCP Cloud Storage
Authentication	JWT / OAuth 2.0 / IAM
Database	MySQL / PostgreSQL (for metadata and logs)
Deployment	Docker, Kubernetes (optional)

Cloud Services Used

Service	Purpose
AWS S3 / Azure Blob / GCP Storage	Encrypted file storage
AWS KMS / Key Vault	Key generation and secure management
IAM / Cloud Identity	Role-based access control
CloudWatch / Stackdriver	Monitoring file access and activities
Lambda / Cloud Functions (optional)	Serverless encryption/decryption processing

Working Flow

User Authentication
- User logs into the platform via secure authentication (JWT / IAM).
File Upload
- The file is encrypted using AES (fast symmetric encryption).
- The AES key is encrypted with the user’s RSA public key.
- Both the encrypted file and the encrypted AES key are stored in the cloud.
File Storage
- Encrypted files are stored in cloud storage (S3/Blob/GCS).
- Metadata and logs are stored in a database.
File Access (Download/Decrypt)
- Authorized user requests a file.
- The encrypted AES key is retrieved and decrypted using the user’s RSA private key.
- The decrypted AES key is used to decrypt the file on demand.
Monitoring & Logs
- Every upload/download is logged for auditing.
- Admin can monitor suspicious access patterns.

Security Features

Hybrid Encryption: AES (performance) + RSA (secure key exchange)
Role-Based Access Control: Users, Admins, Auditors
Key Management: Centralized KMS integration
Audit Logs: Complete tracking of file activity
Transport Security: HTTPS for all file transfers

Visualization Options

Admin Dashboard: Monitor file uploads, access logs, and key status
User Dashboard: Upload/download encrypted files
Graphs/Charts:
- File access trends over time
- Storage usage visualization
- Suspicious activity alerts