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A Novel Approach for Data Encryption Standard Algorithm

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Author(s): Prashanti.G | Deepthi.S | Sandhyarani.K, | Now a day’s providing Security for data is complicated task we have so many security methods that are implemented and deployed but out of them few are using and serving the needs of society. And we can’t say that any algorithm is perfect and avoids threats. The main goal of any design of any encryption algorithm must be security against unauthorized attacks. Within the last decade, data in both the private and public sectors are increased which requires Availability, Authentication, Confidentiality, Integrity. In this paper we are considering The DES algorithm that defines the mathematical steps that transform original text (plain text) into a cipher text (secret code) and also transform the cipher text back to the original text. Here introduces a new method to enhance the performance of the Data Encryption Standard (DES) algorithm. This is done by replacing the 8/32 S-Box instead of 6/4 S-Box. The output of each S-Box undergoes AND and XOR operation before going to the permutation P. In this paper we also proposed a new operation Addition modulo instead predefined XOR operation applied during the 16 round of the standard algorithm.

Journal: International Journal of Engineering and Advanced Technology
ISSN 2249-8958

Volume: 2;
Issue: 5;
Start page: 264;
Date: 2013;
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Keywords: DES | Encryption | Decryption | asymmetric cryptography | symmetric cryptography.

ABSTRACT
Now a day’s providing Security for data iscomplicated task we have so many security methods that areimplemented and deployed but out of them few are using andserving the needs of society. And we can’t say that any algorithm isperfect and avoids threats. The main goal of any design of anyencryption algorithm must be security against unauthorizedattacks. Within the last decade, data in both the private and publicsectors are increased which requires Availability, Authentication,Confidentiality, Integrity. In this paper we are considering TheDES algorithm that defines the mathematical steps that transformoriginal text (plain text) into a cipher text (secret code) and alsotransform the cipher text back to the original text. Here introducesa new method to enhance the performance of the Data EncryptionStandard (DES) algorithm. This is done by replacing the 8/32S-Box instead of 6/4 S-Box. The output of each S-Box undergoesAND and XOR operation before going to the permutation P. Inthis paper we also proposed a new operation Addition moduloinstead predefined XOR operation applied during the 16 round ofthe standard algorithm.
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