Implementasi vigenere cipher 128 dan rotasi bujursangkar untuk pengamanan teks
Implementation of vigenere cipher 128 and square rotation in securing text messages
Rihartanto Rihartanto 
, Riris Kurnia Ningsih, Achmad Fanany Onnilita Gaffar , Didi Susilo Budi Utomo
, Riris Kurnia Ningsih, Achmad Fanany Onnilita Gaffar , Didi Susilo Budi Utomo
Received: 24 Aug 2019;
Revised: 28 Apr 2020; Accepted: 6 May 2020; Available online: 23 May 2020; Published: 31 Jul 2020.
Copyright (c) 2020 Jurnal Teknologi dan Sistem Komputer
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
How to cite (IEEE):
R. Rihartanto, R. K. Ningsih, A. F. O. Gaffar, and D. S. B. Utomo,
"Implementasi vigenere cipher 128 dan rotasi bujursangkar untuk pengamanan teks,"
Jurnal Teknologi dan Sistem Komputer, vol. 8, no. 3, pp. 201-209,
Jul. 2020. https://doi.org/10.14710/jtsiskom.2020.13476
Abstract
Information that can be in the form of text, image, audio, and video, is a valuable asset that needs to be secured from unauthorized parties. This research aims to study the implementation of Vigenere cipher 128 (VC-128) and square rotation to secure text information. The square rotation is applied to increase the security of the encryption results obtained from VC-128. The randomness of the rotation results was measured using Shannon entropy based on the distance between characters, and the Avalanche Effect measured changes in the encryption results compared to the original text. The square rotation can increase the randomness of the VC-128 encryption results, as indicated by an increase in entropy values. The highest increase in entropy of 34.8 % occurs in repetitive texts with the square size that produces optimal entropy was a 9x9 medium-size square. The Avalanche effect for each test data shows inconsistent results ranging from 44.5 % to 49 %.
Keywords: encryption optimization; square rotation; Vigenere cipher; Shannon entropy;Avalanche effect
Funding: P3M Politeknik Negeri Samarinda under contract 1207/PL7/LK/2019; Direktorat Jendral Penguatan Riset dan Pengembangan Kementerian Riset, Teknologi dan Pendidikan Tinggi under contract 151/SP2H/LT/DRPM/2019
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