Tun Myat Aung, Ni Ni Hla · 2019
The rapid development of electronic exchange of digital information increases the importance of information security in storage and transmission of data on public communication network. Cryptography has emerged as a solution that plays an key role in the security of information against malicious attacks. There are various cipher techniques in cryptography, such as monoalphabetic cipher, polyalphabetic cipher, etc. to support data confidentiality as security mechanisms. They are methods of enveloping plain text message into cipher text protecting it from adversaries. The process of encryption of alphabets is the converting original message into non readable form. The Vigenère cipher is one of the most common basic cipher techniques. It is a polyalphabetic cipher technique which uses the Vigenère table for the process of enveloping English alphabets. But Vigenère cipher is longer vulnerable to Kasiski and Friedman attacks based on letter frequency analysis. Thus, in this paper we propose a polyalphabetic cipher that is a new encryption and decryption technique with diffusion and confusion properties based on the concept of the complex cipher used by combining of Vigenère cipher with Affine cipher for the increase of data security in data storage and transmission on public communication networks. Then, our proposed technique is extended by designing based on Myanmar alphabet characters for the increase of data security for Myanmar language. This cipher technique transforms the plain text message in Myanmar alphabet characters into the cipher text in Myanmar alphabet characters using the key in Myanmar alphabet characters.
Cited by 16
Yunus Aydogan, Naim Çağman, İrfan Şimşek · DergiPark (Istanbul University) · 2016
In this study, we define a polyalphabetic cipher method that is called fragmented polyalphabetic (FP) cipher that is based on the fragmented Caesar (FC) cipher. In the FP-cipher, plaintext is encrypted by multiple encryption alphabets which are obtained by using the FC-cipher. We then construct a mathematical modeling and make a computer program of the method.
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Julian Thijssen, Olaf Van Waart, Traditional Cryptography et al. · 2016
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Muhlisatul Mahmudah, Tri Novita Irawati · Jurnal Axioma Jurnal Matematika dan Pembelajaran · 2020
Polyalphabetic cipher cryptosystem is the study of mathematical techniques that related to aspects of information security such as confidentiality, data integrity, authentication and authentication of data origin. With the internet, long distance communication can be done quickly and cheaply. However, the internet is not very secure because it is a public communication medium that can be used by anyone so it is very vulnerable to information tapping. Cryptography has been widely used in life for example banking atm ATMs, account numbers sacrificed, sending secret military messages. By applying polyalphabetic cipher cryptosystems, pins, account numbers and secret messages sent will be more secure and the information will not be easily known. Keywords: polyalphabetic cipher cryptosystem, banking, pin
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William J. Spezeski · 2010
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Hewage, Chaminda, Jayal, Ambikesh, Jenkins, Glenn et al. · SNE Simulation Notes Europe · 2018
Special Issue 'EUROSIM Promotion' was initiated by the EUROSIM Board on the occasion of the board meeting in Budapest, September 2018. Its aim is to promote the various activities of EUROSIM: the EUROSIM Congress, publications of activities of EUROSIM member societies in SNE, and the publication of the ARGESIM/EUROSIM Benchmarks. Representatives of the active EUROSIM societies have compiled a very interesting SNE issue. The electronic version of this issue will be distributed via the EUROSIM mailing list and the printed version will be part of the handouts at the EUROSIM Congress 2019 in Spain (see next page). Two novelties are coming along with this issue. First, the contributions to the ARGESIM Benchmarks are enriched by a broader variety of contribution types (Solution -Report -Study) and by an educational component (as it has turned out that the Benchmark Definitions are frequently used as basis for exercises in simulation education (details see the benchmark overview contribution in this issue). And second, authors now can submit SNE contributions directly via the SNE website (www.sne-
Cited by 5Open access
Tun Myat Aung, Htet Htet Naing, Ni Ni Hla · International Journal of Machine Learning and Computing · 2019
Fast progression of digital data exchange in electronic way, information security is becoming much more important in data storage and transmission on public communication networks. Cryptography has come up as a solution which plays a vital role in information security system against malicious attacks. In cryptography, there are various cipher techniques such as monoalphabetic cipher, polyalphabetic cipher, etc. to support data confidentiality as security mechanisms. They are methods of encrypting plain text message into cipher text protecting it from adversaries. The process of encryption of alphabets is the converting original message into non readable form. One of the most popular cipher techniques is the Vigen re cipher. It is a polyalphabetic cipher technique which uses the Vigen re table for the process of encryption of alphabets. As the Vigen re cipher does not have the properties of diffusion and confusion, it is longer vulnerable to Kasiski and Friedman attacks based on letter frequency analysis. Thus, in this paper we propose a polyalphabetic cipher that is a new encryption and decryption technique with diffusion and confusion properties based on the concept of the complex cipher used by combining of Vigen re cipher with Affine cipher for the increase of data security in data storage and transmission on public communication networks. Our proposed technique can also be considered as a complex transformation technique from Affine cipher known as a monoalphabetic cipher technique to a new polyalphabetic cipher technique that is called Vigen re-Affine cipher.
Cited by 16Open access
Prabha Elizabeth Varghese, Latha R. Nair · Algorithms for intelligent systems · 2019
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Ranju S Kartha, Paul Varghese · International Journal of Computer Sciences and Engineering · 2018
International Journal of Computer Sciences and Engineering (A UGC Approved and indexed with DOI, ICI and Approved, DPI Digital Library) is one of the leading and growing open access, peer-reviewed, monthly, and scientific research journal for scientists, engineers, research scholars, and academicians, which gains a foothold in Asia and opens to the world, aims to publish original, theoretical and practical advances in Computer Science,Information Technology, Engineering (Software, Mechanical, Civil, Electronics & Electrical), and all interdisciplinary streams of Computing Sciences. It intends to disseminate original, scientific, theoretical or applied research in the field of Computer Sciences and allied fields. It provides a platform for publishing results and research with a strong empirical component. It aims to bridge the significant gap between research and practice by promoting the publication of original, novel, industry-relevant research.
Cited by 1Open access
Ghusoon Salim Basheer · Maǧallaẗ al-rāfidayn li-ʿulūm al-ḥāsibāt wa-al-riyāḍiyyāẗ/Al-Rafidain journal for computer sciences and mathematics · 2008
Several Genetic Algorithms have been developed for applications of cryptography problem; the primary distinction among all of them being the G.A. used for decryption problem and obtains the plain text. In this paper a new approach is proposed using Genetic Algorithm with cryptography. G.A. is used to obtain a best secret key in polyalphabetic substitution cipher. This key will be used then for encryption and decryption with a high level of security. The program is written in Matlab language (6.5).
Cited by 2Open access
Arkan Kh Shakr Sabonchi, Bahriye Akay · Tehnicki vjesnik - Technical Gazette · 2020
Today it is necessary to keep information secure and cryptography is the most common technique for data security. The Vigenere cipher, one of the polyalphabetic encryption algorithms, has been used in the history by substitution of the plaintext letters with other alphabet letters using a secret keyword and a systematic table. In order to make the ciphertext readable with a keyless procedure, the cryptanalysis technique is used. However, extracting all possible permutations of the letters is exhaustive or frequency analysis is ineffective to extract the letters from the cipher. Therefore, this study aims to propose an efficient polyalphabetic Vigenere cipher cryptanalysis using Differential Evolution algorithm on English and Turkish texts at different lengths. The efficiency of the Differential Evolution algorithm is compared to those of Genetic Algorithm and Particle Swarm Optimization algorithms in terms of the number of key letters recovered correctly. The results show that Vigenere cipher analysis using Differential Evolution algorithm is more effective in polyalphabetic cryptanalysis.
Cited by 12Open access
Vito, Marco · DSpace repository (University of Tartu) · 2025
The 15th century in Italy was a period of revolution in cryptography. Leon Battista Alberti developed the first western polyalphabetic cipher, while the monoalphabetic system spread throughout the peninsula. The aim of this study is to present a never before published late medieval 15th-century Florentine polyalphabetic cipher, explain its functioning, and shed light on a system—specifically the polyalphabetic cipher—that, although seemingly unused during the 15th century, was in fact employed in Florentine diplomacy.
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Yurika Permanasari, Erwin Harahap · Matematika · 2018
Abstrak. Kriptografi polyalphabetic merupakan improvisasi dari teknik substitusi monoalphabetic. Polyalphabetic substitution chiper melakukan teknik kriptografi monoalphabetic satu kali proses untuk suatu plainteks pesan. Algoritma polyalphabetic cipher membuat ciperteks lebih kuat untuk dapat dipecahkan karena karakter plainteks yang sama tidak dienkripsi dengan cipherteks yang sama. Kunci enkripsi polyalphabetic cipher dapat berbeda sehingga mempunyai kemungkinan kombinasi yang lebih bervariasi dan lebih sulit dipecahkan. Metode Vigenere cipher menjadi dasar dari polyalphabetic substitution cipher. Teknik enkripsi Vigenere cipher menggunakan tabel yang dikenal dengan tabel Vigenere yang digunakan dan menjadi acuan dibeberapa algoritma pengembangan metode polyalphabetic cipher. Metode polyalphabetic cipher lain adalah playfair cipher, menggunakan tabel kunci berupa matriks 5x5 untuk proses enkripsi sehingga memiliki 25! kemungkinan kunci yang cukup sulit dipecahkan.Kata kunci : polyalphabetic cipher, vigenre cipher, playfair cipherAbstract. (Polyalphabetic Cryptography) Polyalphabetic cryptography is an improvisation of monoalphabetic substitution techniques. Polyalphabetic substitution cipher performs one-time monoalphabetic cryptographic technique for a message text message. The polyalphabetic cipher algorithm makes cipertext stronger to be solved because the same plaintext character is not encrypted with the same ciphertext. The key to polyalphabetic cipher encryption can be different so that it has a more varied and more difficult to solve combination possibilities. The Vigenere cipher method is the basis of polyalphabetic substitution cipher. Vigenere cipher encryption techniques use tables known as Vigenere tables which are used and become references in several algorithms for developing polyalphabetic cipher methods. Another polyalphabetic cipher method is playfair cipher, using a key table in the form of a 5x5 matrix for the encryption process so that it has 25! Possible keys that are quite difficult to solve.Keywords: polyalphabetic cipher, vigenere cipher, playfair cipher
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Nuke Sephiana, Muhlis Tahir, Shinta Dwi Wulandari et al. · Explore IT Jurnal Keilmuan dan Aplikasi Teknik Informatika · 2023
Pada era menuju perkembangan revolusi industri 5.0, Teknologi informasi dan komunikasi telah menjadi elemen terpenting dalam kehidupan manusia. Sehingga pemanfaatan suatu teknologi informasi dan komunikasi dalam bidang keamanan mampu diterapkan di mana saja, salah satunya pada keamanan data. Ilmu keamanan data disebut dengan kriptografi. Pada penelitian ini, penulis akan menganalisis dua jenis cipher substitusi pada suatu kriptografi klasik, yakni polyalphabetic substitution cipher dan Monoalphabetic cipher. Tujuan dari dilakukannya penelitian ini bermaksud untuk memberikan informasi tentang algoritma polyalphabetic substitution cipher (cipher abjad tunggal) dan Monoalphabetic substitution cipher (cipher abjad majemuk), serta untuk membandingkan kedua metode algoritma kriptografi untuk dapat diketahui penggunaan yang lebih efektif dan efisien untuk menjaga keamanan data. Metode penelitian ini berupa studi literatur menggunakan pendekatan kualitatif dengan teknik pengumpulan data berbentuk catatan, buku, makalah atau artikel, dan jurnal. Hasil analisis yang diperoleh pada uji coba algoritma monoalphabetic cipher dan polyalphabetic cipher yaitu algoritma polyalphabetic cipher lebih sulit dipecahkan karena algoritma lebih panjang. Pada algoritma polyalphabetic cipher, plaintext yang sama didekripsi dengan kunci yang berbeda dan menghasilkan ciphertext yang berbeda, sehingga sulit untuk menggunakan metode tebakan untuk menerjemahkan pesan. Sedangkan pada algoritma monoalphabetic cipher menggunakan analisis frekuensi huruf, sehingga mudah didekripsi mengunakan metode tebakan. Sehingga algoritma kriptografi polyalphabetic cipher efektif dan efisien dalam keamanan data.
Cited by 1Open access
Prachi Patni · IOSR Journal of Computer Engineering · 2014
In the modern world as there is drastic hike in use of internet for our daily work there is need to keep our information safe and secure so that an intruder can't misuse it. Cryptography was established to solve this problem. Cryptography is an art of transforming information (Plain Text) using encrypting algorithms into a form that is not readable (Cipher Text) without access to specific decoding algorithms. In this paper the author presents a novel approach to cryptographic techniques and illustrates the result and analysis of the proposed algorithm and points out that it is with improved security from many kind of attacks. This paper is partitioned in following sections: 1 st section contain basic introduction about cryptography and Caesar Cipher, 2 nd section includes proposed system, 3 rd contain performance analysis where proposed system is compared with other techniques, 4 th include Conclusion and Future Scope and last section contains References.
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Sindi Lukmaini, Yanuar Bhakti Wira Tama, Kartika Nugraheni · JURNAL MATEMATIKA MURNI DAN TERAPAN EPSILON · 2024
TTechnological advances have a great influence on facilitating long-distance communication, one of which is exchanging messages. The security of a message is an important aspect of protecting sensitive information. Cryptography is a branch of science that aims to maintain the confidentiality, integrity, and authenticity of messages in communication. One of the cryptographic methods used is Hill Cipher, which converts plaintext into ciphertext using a key matrix, but Hill Cipher is vulnerable to cryptanalysis attacks, especially if the key matrix is not chosen properly. Based on these problems, this research was conducted by applying the Hill Cipher algorithm with permutation as an additional layer of security. This study aims to analyze the effect of the message and key matrix on the performance of computation time in the encryption and decryption process of Hill Cipher combined with permutation, where the message characters are limited to 26 alphabetic characters and the use of Hill block length and permutation techniques is set at 5 characters. The simulation results show the average performance of computation time on the encryption and decryption process is 0.000083199 seconds and 0.000113493 seconds for a message with 707 characters. The key matrix used must be invertible, and the performance of computation time on encryption and decryption with different keys is 0.000094817 seconds and 0.00025938 seconds.
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Robby Firmansyah, Dimas Aditya Putranto, Alfaza Putra Adjie Ariefiansyah et al. · JATI (Jurnal Mahasiswa Teknik Informatika) · 2025
Polyalphabetic Cipher adalah algoritma enkripsi yang menggunakan beberapa alfabet substitusi untuk meningkatkan keamanan dibandingkan metode monoalphabetic. Penelitian ini mengeksplorasi keamanan algoritma Polyalphabetic Cipher terhadap berbagai serangan, seperti analisis frekuensi dan brute force, serta menilai efisiensinya dalam enkripsi dan dekripsi teks. Eksperimen dilakukan dengan berbagai panjang teks dan kunci untuk mengevaluasi kinerja algoritma ini. Hasil penelitian menunjukkan bahwa Polyalphabetic Cipher lebih aman terhadap analisis frekuensi dibandingkan algoritma monoalphabetic. Namun, kelemahan muncul ketika panjang kunci terlalu pendek, yang dapat dieksploitasi melalui teknik kriptanalisis seperti Kasiski Examination. Dari sisi efisiensi, algoritma ini bekerja cukup baik untuk teks berukuran kecil hingga menengah, meskipun waktu proses akan meningkat seiring bertambahnya panjang teks dan kunci. Hasil simulasi menunjukkan bahwa ciphertext yang dihasilkan oleh Polyalphabetic Cipher tidak menunjukkan pola distribusi huruf yang jelas, sehingga sulit dianalisis. Selain itu, algoritma ini terbukti lebih tahan terhadap brute force attack dengan kunci yang panjang dan acak. Penelitian ini juga memberikan wawasan mengenai peningkatan keamanan algoritma dengan penggunaan kunci pseudo-acak dan penggabungan algoritma modern. Kesimpulannya, Polyalphabetic Cipher tetap relevan untuk digunakan dalam skenario yang membutuhkan keseimbangan antara keamanan yang tinggi dan efisiensi waktu pemrosesan.
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Iosr Journals, Prachi Patni · Figshare · 2014
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Naipospos, Octavia Habriningsih · Universitas Kristen Satya Wacana Institutional Repository (Universitas Kristen Satya Wacana) · 2016
Salah satu proses komunikasi dan pertukaran data yang aman adalah komunikasi yang melibatkan proses enkripsi dan dekripsi di dalamnya. Caesar Cipher merupakan salah satu teknik untuk mengamankan pesan. Namun saat ini Caesar mulai ditinggalkan karena algoritmanya yang terlalu sederhana dan telah dipecahkan oleh kriptanalis brute force attack (BFA). Berdasarkan alasan tersebut tulisan ini memodifikasi Caesar cipher dengan memperluas pemil ihan kunci geser dari 26 menjadi 127 serta menggunakan dua matriks bujursangkar ordo 3 sebagai kunci pada Caesar cipher. Hasil modifikasi kriptografi ini dapat menahan kriptanalisis brute force attack.
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S Ravichandran Ayyer · Zenodo (CERN European Organization for Nuclear Research) · 2026
This paper introduces the Octal-Length Polyalphabetic Cipher (OLPC), a symmetric cryptographic model designed for compact numeric environments.
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