# Cloud Computing: A CRM Service Based on a Separate Encryption and Decryption using Blowfish algorithm

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3 To illustrate the concept of our proposed business model, Fig. 2 presents an example in which the user uses separate cloud services for CRM, storage and encryption/decryption. According to the user s needs, CRM Cloud Services could be swapped for other function-specific application services (e.g., ERP Cloud Services, Account Software Cloud Services, Investment Portfolio Selection and Financial Operations Cloud Services)[2]. The exact method used to calculate these subkeys will be described later. Encryption: Blowfish is a Feistel network consisting of 16 rounds (see Figure 1). The input is a 64-bit data element, x. Divide x into two 32-bit halves: xl, xr For i = 1 to 16: xl = xl XOR Pi xr = F(xL) XOR xr Swap xl and xr Swap xl and xr (Undo the last swap.) xr = xr XOR P17 xl = xl XOR P18 Recombine xl and xr Fig 2: Business model concept integrating separate cloud services for data encryption/decryption, CRM and storage BLOWFISH ALGORITHM: Blowfish is a variable-length key block cipher. It does not meet all the requirements for a new cryptographic standard discussed above: it is only suitable for applications where the key does not change often, like a communications link or an automatic file encryptor. It is significantly faster than DES when implemented on 32-bit microprocessors with large data caches, such as the Pentium and the PowerPC. DESCRIPTION OF THE ALGORITHM Blowfish is a variable-length key, 64-bit block cipher. The algorithm consists of two parts: a key-expansion part and a data-encryption part. Key expansion converts a key of at most 448 bits into several subkey arrays totaling 4168 bytes. Data encryption occurs via a 16-round Feistel network. Each round consists of a key-dependent permutation, and a keyand data-dependent substitution. All operations are XORs and additions on 32-bit words. The only additional operations are four indexed array data lookups per round. Subkeys: Blowfish uses a large number of subkeys. These keys must be precomputed before any data encryption or decryption. 1. The P-array consists of bit subkeys: P1, P2,..., P There are four 32-bit S-boxes with 256 entries each: S1,0, S1,1,..., S1,255; S2,0, S2,1,..,, S2,255; S3,0, S3,1,..., S3,255; S4,0, S4,1,..,, S4,255. Function F (): Divide xl into four eight-bit quarters: a, b, c, and d F(xL) = ((S1,a + S2,b mod 232) XOR S3,c) + S4,d mod 232 Decryption is exactly the same as encryption, except that P1, P2,..., P18 are used in the reverse order. Implementations of Blowfish that require the fastest speeds should unroll the loop and ensure that all subkeys are stored in cache. Generating the Subkeys: The subkeys are calculated using the Blowfish algorithm. The exact method is as follows: 1. Initialize first the P-array and then the four S-boxes, in order, with a fixed string. This string consists of the hexadecimal digits of pi (less the initial 3). For example: P1 = 0x243f6a88 P2 = 0x85a308d3 P3 = 0x13198a2e P4 = 0x XOR P1 with the first 32 bits of the key, XOR P2 with the second 32-bits of the key, and so on for all bits of the key (possibly up to P14). Repeatedly cycle through the key bits until the entire P-array has been XORed with key bits. (For every short key, there is at least one equivalent longer key; for example, if A is a 64-bit key, then AA, AAA, etc., are equivalent keys.) 3. Encrypt the all-zero string with the Blowfish algorithm, using the subkeys described in steps (1) and (2). 4. Replace P1 and P2 with the output of step (3). 5. Encrypt the output of step (3) using the Blowfish algorithm with the modified subkeys. 6. Replace P3 and P4 with the output of step (5). 7. Continue the process, replacing all entries of the P- array, and then all four S-boxes in order, with the output of the continuously-changing Blowfish algorithm. In total, 521 iterations are required to generate all required ISSN: Page 594

4 subkeys.applications can store the subkeys rather than execute this derivation process multiple times. 4. EXPERIMENTAL RESULTS All experiments were performed with the configurations Intel(R) Core(TM)2 CPU 2.13GHz, 2 GB RAM, and the operation system platform is Microsoft Windows XP Professional (SP2) Home page of Cloud Security: LMS home page: If the cipher server is alive Cloud Service Login Page: Error Status page in LMS: Cloud Services after login: If Cloud System is Hacked: ISSN: Page 595

5 5. CONCLUSION AND FUTURE WORK Computing and Communications (HPCC-08, IEEE CS Press, Los Alamitos,CA, USA) [4] Mehrdad Mahdavi Boroujerdi, Soheil Nazem, Cloud Computing: Changing Cogitation about Computing, World Academy of Science, Engineering and Technology [5] Amazon web service, [Online]. Available: [6] Top Threats to Cloud Computing V1.0, Cloud Security Alliance, March [7] L. M. Vaquero,L. Rodero-Merino,J. Caceres, and M. Lindner, A break in the clouds: towards a cloud definition, ACM SIGCOMM Computer Communication Review, vol. 39, no. 1, pp , January [8] C. Weinhardt, A. Anandasivam, B. Blau, N. Borissov, T. Meinl, W. Michalk, and J. Stößer, Cloud computing a classification, business models, and research directions, Business & Information Systems Engineering (BISE), vol. 1, no. 5, pp , [9] N. Hawthorn, Finding security in the cloud, Computer Fraud & Security, vol. 2009, issue 10, pp , October [10] A. Parakh and S. Kak, Online data storage using implicit security, Information Sciences, vol. 179, issue 19, pp ,September This system effectively identifies security laws in the CRM applications using Blowfish algorithm effectively.after establishing Independent Encryption/Decryption Services in cloud computing environments, users of cloud computing services (e.g., CRM, ERP, etc.) will use the services of at least two cloud computing service providers, so agreements between these service providers are required to establish a model for cooperation and division of responsibilities in providing a common service to clients. This study provides a draft of a multi-signatory Service Level Agreement (SLA) in which the signatories can include cloud computing rental users, application service providers, encryption/decryption service providers, storage service providers, etc., with content including the rights and obligations between operators and also includes data security policies between each operator and clients. In future this system is extended to implement in commercial applications like Amazon aws in order to give more security cloud services to the end users. 6.REFERENCES [1]A Business Model for Cloud Computing Based on a Separate Encryption and Decryption Service. decryption-service/ [2] David S. Linthicum, Cloud Computing and SOA Convergence in your Enterprise, Pearson, [3] R. Buyya, C. S. Yeo, and S. Venugopa, Marketoriented Cloud Computing: Vision, hype, and reality for delivering it services as computing utilities, in Proceedings of the 10th IEEE International Conference on High Performance ISSN: Page 596

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