A Proposed Method for Text Encryption using Symmetric and Asymmetric Cryptosystems

International Journal of Computer Trends and Technology (IJCTT)          
© 2017 by IJCTT Journal
Volume-50 Number-2
Year of Publication : 2017
Authors : HayderRaheem Hashim, Mohammed Abdul HameedJasemAlkufi


HayderRaheem Hashim, Mohammed Abdul HameedJasemAlkufi "A Proposed Method for Text Encryption using Symmetric and Asymmetric Cryptosystems". International Journal of Computer Trends and Technology (IJCTT) V50(2):94-100, August 2017. ISSN:2231-2803. www.ijcttjournal.org. Published by Seventh Sense Research Group.

Abstract -
This proposed method focuses on encrypting texts that are written in English or Arabic language using symmetric and asymmetric cryptosystems respectively.Thesymmetric and asymmetric cryptosystems presentedby Vigenere Cipher and RSA Cryptosystem respectively. Therefore, a plaintext encrypted using Vigenere Cipher, then the obtained ciphertext must be encrypted again using RSA Cryptosystem in a way that makes this method programmed using MATLAB.Therefore, this suggested method has a higher level of security than either Vigenere Cipher or RSA Cryptosystem since its security relies on the hardness of factoring the product of two large prime numbers, the factoring problem and on the secrecy of the keyword of the Vigenere Cipher. Therefore, this method gives us the confidence of using Vigenere cipher over text messages as a part of asymmetric cryptography and suggests a new method for encrypting text messages.

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Vigenere Cipher, RSA Cryptosystem, Encryption, Decryption, MATLAB.