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Improving Security of Vigenère Cipher by Double Columnar Transposition

International Journal of Computer Applications
© 2014 by IJCA Journal
Volume 100 - Number 14
Year of Publication: 2014
Nishith Sinha
Kishore Bhamidipati

Nishith Sinha and Kishore Bhamidipati. Article: Improving Security of Vigenere Cipher by Double Columnar Transposition. International Journal of Computer Applications 100(14):6-10, August 2014. Full text available. BibTeX

	author = {Nishith Sinha and Kishore Bhamidipati},
	title = {Article: Improving Security of Vigenere Cipher by Double Columnar Transposition},
	journal = {International Journal of Computer Applications},
	year = {2014},
	volume = {100},
	number = {14},
	pages = {6-10},
	month = {August},
	note = {Full text available}


Protecting data from malicious attacks during storage and transmission is the reason for using encryption. Encryption can be achieved by two methods – Transposition and Substitution. Transposition refers to changing the order of characters in a given text. On the other hand, substitution is the process of replacing each character of the plaintext with some other character. Using a combination of transposition and substitution for encryption leads to greater security when compared to using either of them separately. Vigenère Cipher is a poly-alphabetic cipher. It is based on the substitution technique which uses multiple substitution alphabets. In this paper, we introduce double columnar transposition on Vigenère Cipher to enhance its security making cryptanalysis difficult.


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