This document proposes a system called proxy-oriented data uploading and remote data integrity checking using identity-based public key cryptography (ID-PUIC) to address security issues in public cloud storage. The system allows a user to designate a proxy to upload data to the cloud on their behalf and check the integrity of the remotely stored data without downloading it. The proposed ID-PUIC protocol uses cryptographic techniques like key generation, encryption, and decryption to securely upload data from proxies, detect malware, and verify data integrity in a private or public manner depending on the user's authorization. The system aims to improve security, efficiency and flexibility compared to existing public key infrastructure approaches for remote data integrity checking and proxy-based data uploading in public