A Modified Version of Vigenere Cipher using 95×95 Table 
Khairun Nahar1, Partha Chakraborty2
1Khairun Nahar*, Department of CSE, Comilla University, Cumilla, Bangladesh.
2Partha Chakraborty, Department of CSE, Comilla University, Cumilla, Bangladesh.
Manuscript received on June 01, 2020. | Revised Manuscript received on June 08, 2020. | Manuscript published on June 30, 2020. | PP: 1144-1148 | Volume-9 Issue-5, June 2020. | Retrieval Number: E9941069520/2020©BEIESP | DOI: 10.35940/ijeat.E9941.069520
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Cryptography is a current field of research at the moment as it can be crucial to offer protection to extremely delicate and confidential records from criminal wrongdoings throughout transmission over the network. The vigenere cipher is one of the standard cryptographic algorithms that prevent attackers from understanding the raw data throughout the transmission. The traditional vigenere cipher encrypts only the alphabetic plaintext with a 26×26 vigenere table because it includes only 26 English alphabets A to Z. The researcher extended the original vigenere table into 95×95 which introduces all possible characters, mathematical symbols, digits, and punctuations that are available on an ordinary QWERTY keyboard layout that can be encrypted easily by this technique and conjointly introduced case sensitivity. The objective of this modification makes the cryptanalysis procedure more difficult and increases the information security.
Keywords: Cryptography, Poly-Alphabetic cipher, Vigenere cipher, Substitution cipher, Cipher techniques.