# Enhance Load Rebalance Algorithm for Distributed File Systems in Clouds

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4 in It is mostly used in key distribution and digital signature processes. RSA is based on a one-way function in number theory, called integer factorization. RSA is a block cipher in which every message is mapped to an integer. RSA consists of public-key and private-key [16]. Encryption is done by the Cloud service provider and decryption is done by the Cloud user or consumer. Once the data is encrypted with the Public-Key, it can be decrypted with the corresponding Private-Key only. We use the RSA algorithm (William, 2005) as a basis to provide data-centric security for shared files. RSA algorithm involves three steps [17]. (i) First, in Key generation before the data is encrypted, Key generation should be done. This process is done between the Cloud service provider and the user. (ii) Second, in Encryption is the process of converting original plain text (data) into cipher text (data). (iii)third, Decryption is the process of converting the cipher text (data) to the original plain text (data). A. Key Generation Algorithm 1) Randomly and secretly choose two large primes: p, q and compute n = p. q 2) Compute ϕ (n) = (p 1) (q 1). 3) Select Random Integer: e such as 1< e< n and gcd (e, ϕ) = 1. 4) Compute d such as e. d 1 mod ϕ (n) and 1 < d < ϕ (n). 5) Public Key: (e, n) 6) Private Key: (d, n). 7) This key sends to user s id. B. Encryption Process 1) Suppose user needs to view uploaded files from server. 2) Server should send his public key to user s id. 3) Cipher text c = message e mod n C. Decryption Process 1) Plain text p = cipher text d mod n. 2) User can view a file from server after entering the correct key. That key will be generate and send to the user s id. Only authorized user retrieve the encrypted data and decrypt it. Even if anyone happens to read the data accidentally, the original meaning of the data will not be understood. The most important advantage of RSA is ensuring about the privacy of the private key because this key will not be transmitted or revealed to another user. Assist Qos Quality of Service (QoS) is a broad term used to describe the overall experience a user or application will receive over a network. In cloud computing is a way of computing model in which frequently real time scalable resources acting as a file, data, programs, hardware, and third party services can be accessible from a Web browser via the Internet to users. These customers pay only for the used computer resources and services by means of customized service level agreement. The SLA is a contract negotiated and agreed between a customer and a service provider. That is, the service provider is required to execute service requests from a customer within negotiated quality of service (QoS) requirements for a given price. According to QoS requirements a customer is in general concerned about response time rather than throughput in QoS requirements. Cloud computing specifically, in an effort to deliver QoS guaranteed services in such a computing environment, we find the relationship among the maximal number of customers, the minimal service resources and the highest level of services, calculate response time. Our proposed calculate the response time of whole system. The main advantage of QoS in cloud computing, to improve the performance of whole system, ensures high speed, reduce time consistency. Uniformly distributed these files so, avoid delay, data loss of whole system. Fig 3.User Browse Files from Sub Servers Fig 4.User enter key for view files from sub servers Fig5.Evaluate response time of whole system 123

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