scholarly journals A Modifying of Hill Cipher Algorithm with 3 Substitution Caesar Cipher

2017 ◽  
Vol 1 ◽  
pp. 157-163
Author(s):  
Azzam Mujaddid ◽  
Sumarsono Sumarsono
Keyword(s):  
Matrix Multiplication ◽  
Process Modification ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
Time Required ◽  
The Hill

The hill cipher algorithm has the uniqueness of using matrix multiplication in the process where the key used is a matrix that has weaknesses in the process of encryption and decryption. In this paper will be modified to the encryption process with caesar cipher substitution. The principle of the hill cipher algorithm using the multiplication of the 2x2 key matrix of keys is enhanced through process modification lies in the combination of initial character determination using the substitution of 3 caesar ciphers. From the results of this modification can be seen that the more the number of characters processed the time required will be longer. The magnitude of the determinant also affects time and size during the poses. A 1 character increment occurs if the initial character of the encryption process is an odd number.

scholarly journals Application of Hill Cipher Algorithm in Securing Text Messages

2018 ◽  
Author(s):  
Andysah Putera Utama Siahaan
Keyword(s):  
Computer Security ◽  
Matrix Theory ◽  
Text Messages ◽  
Symmetric Cryptography ◽  
Cryptographic Algorithm ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
The Matrix ◽  
Cryptographic Techniques ◽  
The Hill

Computer security aims to help users prevent fraud or detect fraud in an information-based system. The information must be secured to be free from threats. Cryptographic techniques can prevent data theft. One cryptographic algorithm is Hill Cipher. This algorithm is one symmetric cryptography algorithm. The Hill Cipher algorithm uses an m x m sized matrix as the key to encryption and decryption. The fundamental matrix theory used in Hill Cipher is multiplication between matrices and inverses the matrix. Hill Cipher has two types of matrices in general, 2 x 2 and 3 x 3. This study discusses the order 2 x 2. The application of Hill Cipher in text-shaped media is highly recommended because it has fast encryption and decryption speeds. This method is very good at securing data that will be transmitted on an open network.

scholarly journals Genetic Algorithm in Hill Cipher Encryption

2017 ◽  
Author(s):  
Andysah Putera Utama Siahaan
Keyword(s):  
Genetic Algorithm ◽  
Genetic Algorithms ◽  
Evaluation Function ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
The Matrix ◽  
The Hill

The matrix in Hill Cipher was designed to perform encryption and decryption. Every column and row must be inserted by integer numbers. But, not any key that can be given to the matrix used for the process. The wrong determinant result cannot be used in the process because it produces the incorrect plaintext when doing the decryption after the encryption. Genetic algorithms offer the optimized way to determine the key used for encryption and decryption on the Hill Cipher. By determining the evaluation function in the genetic algorithm, the key that fits the composition will be obtained. By implementing this algorithm, the search of the key on the Hill Cipher will be easily done without spending too much time. Genetic algorithms do well if it is combined with Hill Cipher.

scholarly journals Enkripsi Data Citra untuk Model Warna RGB dan Treshold Menggunakan Algoritma Hill Cipher

2019 ◽  
Vol 4 (1) ◽  
pp. 175-178
Author(s):  
Ommi Alfina
Keyword(s):  
Digital Media ◽  
Threshold Model ◽  
Matrix Multiplication ◽  
Digital Data ◽  
Original Form ◽  
Diverse Range ◽  
Black And White ◽  
Hill Cipher ◽  
The Matrix ◽  
The Hill

With the increasingly widespread abuse of digital media, especially in the form of images or images, it increasingly disrupts the rights and privacy of everyone. Many forms of abuse that occur in digital media through internet facilities such as plagiarism of photographer's work, recognition of the rights of the image, to upload photos of privacy to internet media. Therefore, one way to secure digital data in the form of images is to randomize (encrypt) the images that we feel are very important so that the image can no longer be interpreted by others. If we need these data, we just need to return it (decryption) so that the encryption image can return to its original form. Hill Cipher algorithm is one method to randomize a data by encoding and multiplying the matrix. For its application in the form of image data, a trial is needed by creating a software which will then analyze the results into several color models such as RGB, Grayscale (Keabuan) and Tresholding (Black and White). From the test results, it can be concluded that the greater the input matrix value of the Hill Cipher Algorithm, the more encrypted image results will be obtained or in other words the more incomprehensible the visual form by humans. Then the Hill Cipher algorithm cannot be applied to the color threshold model (black and white) because the matrix multiplication obtained does not have a diverse range of values

scholarly journals Unimodular matrix and bernoulli map on text encryption algorithm using python

2021 ◽  
Vol 12 (2) ◽  
pp. 447-455
Author(s):  
Samsul Arifin ◽  
Indra Bayu Muktyas ◽  
Puguh Wahyu Prasetyo ◽  
Abdul Azis Abdillah
Keyword(s):  
Matrix Multiplication ◽  
Text Message ◽  
Encryption Algorithm ◽  
Symmetric Cryptography ◽  
Full Matrix ◽  
Unimodular Matrix ◽  
Hill Cipher ◽  
Encryption Algorithms ◽  
Map Series ◽  
The Hill

One of the encryption algorithms is the Hill Cipher. The square key matrix in the Hill Cipher method must have an inverse modulo. The unimodular matrix is one of the few matrices that must have an inverse. A unimodular matrix can be utilized as a key in the encryption process. This research aims to demonstrate that there is another approach to protect text message data. Symmetric cryptography is the sort of encryption utilized. A Bernoulli Map is used to create a unimodular matrix. To begin, the researchers use an identity matrix to generate a unimodular matrix. The Bernoulli Map series of real values in (0,1) is translated to integers between 0 and 255. The numbers are then inserted into the unimodular matrix's top triangular entries. To acquire the full matrix as the key, the researchers utilize Elementary Row Operations. The data is then encrypted using modulo matrix multiplication.

scholarly journals Aplikasi Operasi Matriks pada Perancangan Simulasi Metode Hill Cipher Menggunakan Microsoft Excel

2021 ◽  
Vol 6 (1) ◽  
pp. 41
Author(s):  
Endaryono Endaryono ◽  
Nurfidah Dwitiyanti ◽  
Heri Satria Setiawan
Keyword(s):  
Inverse Matrix ◽  
Message Content ◽  
Simulation Design ◽  
Work Process ◽  
Microsoft Excel ◽  
Cipher Text ◽  
Matrix Operations ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
The Hill

<p><em>One of several algorithms in cryptography is the Hill Cpher method. This method is used in randomizing the contents of the message using a password key in the form of a matrix with the order MXM. The product in this research is a simulation design to explain how a plaintext message is converted into cipher text with encryption and decryption processes and vice versa from ciphertext to paintext through multiplication and inverse matrix operations. using Microsoft Excel (MS Excel). In this study, a matrix with order 2x2 and modulo 26 was used. This simulation design shows how the work process visually for each step in the process of changing the message content in the Hill Cipher method. It is hoped that the results of this study can be used as a learning medium by the community, especially students and lecturers, to increase understanding and broaden their horizons about the Hill Cipher method in cryptography lectures.</em><em></em></p>

scholarly journals Dynamic Key Matrix of Hill Cipher Using Genetic Algorithm

2017 ◽  
Vol 6 (4) ◽  
pp. 313
Author(s):  
Andysah Putera Utama Siahaan
Keyword(s):  
Genetic Algorithm ◽  
Genetic Algorithms ◽  
Evaluation Function ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
The Matrix ◽  
Dynamic Key ◽  
The Hill

The matrix in Hill Cipher was designed to perform encryption and decryption. Every column and row must be inserted by integer numbers. But, not any key that can be given to the matrix used for the process. The wrong determinant result cannot be used in the process because it produces the incorrect plaintext when doing the decryption after the encryption. Genetic algorithms offer the optimized way to determine the key used for encryption and decryption on the Hill Cipher. By determining the evaluation function in the genetic algorithm, the key that fits the composition will be obtained. By implementing this algorithm, the search of the key on the Hill Cipher will be easily done without spending too much time. Genetic algorithms do well if it is combined with Hill Cipher.

scholarly journals Image Encryption Using Orthogonal Hill Cipher Algorithm

2018 ◽  
Vol 7 (4.10) ◽  
pp. 59
Author(s):  
K. Madhusudhan Reddy ◽  
Anirudh Itagi ◽  
Saransh Dabas ◽  
Bonam Kamala Prakash
Keyword(s):  
Image Encryption ◽  
Conventional Method ◽  
Orthogonal Matrix ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
Practical Algorithm ◽  
The Hill ◽  
The Given

The Hill Cipher algorithm is a practical algorithm which requires only preliminary knowledge of matrices which makes it quite useful. But, for decrypting the encoded information the key matrix needs to have an inverse (The key matrix needs to be invertible) or else it is impossible to decrypt the given information. The main objective of our paper is to introduce an unorthodox and improved version of Hill Cipher which will make encryption and decryption of an image easier. This paper has diverged from the conventional method by using an orthogonal matrix (where the transpose of a matrix is equal to its inverse) as our key matrix. This method is faster and easier as finding the transpose of a matrix is much simpler than finding the inverse of a given matrix and hence, facilitating the process of faster execution. To further break down the process into an even simpler one, we have added a few more constraints. To show its application, we have used this method to encrypt images using MatLab.  

scholarly journals Optimization of Hill Cipher Method for Encryption and Decryption of Prescription Drugs at Puskesmas Twano Jayapura City

2021 ◽  
Vol 2 (4) ◽  
pp. 129-134
Author(s):  
Elvis Pawan ◽  
Patmawati Hasan
Keyword(s):  
Prescription Drugs ◽  
Drug Prescription ◽  
Health Sector ◽  
Maximum Level ◽  
Drug Dose ◽  
Postal Code ◽  
Technological Advances ◽  
Hill Cipher ◽  
Encryption And Decryption ◽  
The Hill

A drug prescription is a written request from a doctor to a pharmacist that must be kept secret because it contains certain doses of drugs and types of drugs that cannot be known by just anyone, especially those who are not interested. From time to time technological advances have a rapid impact on all sectors, both private and government agencies, including the health sector. One form of service in the health sector that can utilize information technology is the manufacture of electronic drug prescriptions that can be sent via an application from a doctor to a pharmacist. The frequent misuse of prescription drugs by unauthorized persons, as well as errors by officers at the pharmacy in reading prescriptions can be fatal for the community, so a solution is needed to overcome this problem. This application is designed using the Hill Cipher Algorithm which is one of the classic types of algorithms in the field of cryptography, but to get the maximum level of security, the algorithm key will be modified using a postal code pattern as a matrix key. Broadly speaking, the Encryption Stage is the first starting from the plaintext which is the type of drug and drug dose, the second key matrix using a POS code pattern, the three plaintexts are converted into blocks, the fourth is arranged into a 2x2 matrix, the fifth is multiplied between the key and the sixth plaintext is multiplied into mod 26 to generate an encrypted ciphertext or recipe. The success rate of system functionality testing using the blackbox method is 100%

STEGANOGRAFI DENGAN MENGGUNAKAN METODE LSB DAN ALGORITMA HILL CIPHER

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Sherly Gina Supratman
Keyword(s):  
Digital Images ◽  
Text Messages ◽  
The Internet ◽  
Digital Imagery ◽  
Least Significant Bit ◽  
Hill Cipher ◽  
Secure Data ◽  
Audio Video ◽  
The Hill

AbstrakJaringan Komunikasi seperti Internet� merupakan jaringan yang tidak aman untuk mentransmisi data, seperti teks, audio,video dan citra digital. Salah satu cara untuk pengamanan data dapat dilakukan dengan menggunakan proses kriptografi dan �steganografi. Penggunaan ini dengan tujuan untuk merahasiakan pesan yang dikirim dan sekaligus menghindarkan pesan tersebut dari kecurigaan pihak lain yang tidak berkepentingan.Pesan yang digunakan dalam makalah ini adalah berupa text dengan menyisipkannya pada gambar. Pada proses kriptografi, pesan yang berupa text akan dienkrip dengan algoritma Hill Chiper, dan kemudian pesan yang telah dienkrip akan dilakukan proses steganografi pada citra digital� 8 bit dengan skala 0 � 255, dengan metode Least Significant Bit ( LSB ).�Kata kunci: Kriptografi, Hill Chiper, Steganografi, Least Significant Bit�AbstractCommunication Networks such as the Internet are unsafe networks for transmitting data, such as text, audio, video and digital imagery. One way to secure data can be done by using cryptography and steganography process. This use is for the purpose of concealing messages being transmitted and avoiding such messages from the suspicion by others who are not interested.The message used in this paper is text by inserting it in the image. In the cryptographic process, text messages will be encrypted with the Hill Chiper algorithm, and then the encrypted message will be steganographed on 8-bit digital images on a scale of 0-255, using the Least Significant Bit (LSB) method.�Keywords: Cryptography, Hill Chiper, Steganography, Least Significant Bit

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