-Class 1 (Layer 1): class authenticate users accessing cloud computing, with solution is usually applied using a password one time (One Time Password-OTP). The system requires high-safety will require mutual authentication is that users and vendors, but with the cloud provider for free, then only a one-way authentication (Figure 3).-Class 2 (Layer 2): this class guarantees coded data (Data Encryption), data integrity (Data Integrity) and the protection of user privacy (Private User Protection) through a symmetric encryption algorithm.-3-Layer (Layer 3): class user data for fast recovery of data according to the speed.
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