Client-to-Provider Cipher

Overview

CTPC is a professional-grade security utility engineered to transform raw local files into encrypted payloads. It eliminates reliance on third-party cloud provider trust by ensuring that all cryptographic operations occur exclusively on the local client, guaranteeing that only the user-held key can ever unlock the data.

Challenge

Modern cloud storage sync services often lack end-to-end encryption with user-owned keys. This leaves sensitive data exposed to provider-side monitoring, potential data breaches, or compliance risks during transit and at rest in the cloud.

Solution

Developed a streaming CLI pipeline that processes binary file streams on the local machine. By applying AES-256-CBC encryption before network egress, the tool creates an immutable barrier between raw data and cloud-based storage infrastructure.

Key features

• High-performance streaming encryption/decryption
• Recursive directory and glob-pattern file filtering
• Built-in performance benchmarking (throughput and file-per-second analysis)
• Preservation of folder hierarchy during bulk encryption

Results

• Achieved stable throughput exceeding 100MB/s on standard hardware
• Implemented recursive directory processing with advanced glob pattern matching
• Delivered zero-knowledge security, ensuring no unencrypted data leaves the local environment
• Successfully published to NPM as @nikhil07k/ctpc

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