This document summarizes a research paper that proposes two secure systems called Sec Cloud and Sec Cloud+ for enhancing security when accessing massive data stored in the cloud. Sec Cloud achieves both integrity auditing and file deduplication by encrypting plain data files before performing integrity auditing on the encrypted files. Sec Cloud+ manages deduplication on encrypted files directly, operating on secure encrypted files. The proposed systems aim to provide security while allowing integrity auditing and deduplication functionality on encrypted data in the cloud.