Vigenere Cipher Research Articles

Encryption of Text Message on Audio Steganography Using Combination Vigenere Cipher and LSB (Least Significant Bit)

The growing information technology is very rapidly, the more evolving crime techniques to find information that is confidential. The Internet is one of the main media in disseminating information. The use of security on the internet still needs to be developed. Based on these problems, the type of research undertaken in the writing of this final task is the type of experimental research by developing methods that have been done by previous researchers to hide secret data that is inserted into the audio * .wav so that the security and confidentiality of data can be guaranteed. data security can be done with various methods, including cryptography and steganography. Cryptography is a technique for encrypting messages and steganography is a message concealment technique. This insertion type uses binary ASCII character code. In the cryptographic process, using the Vigenere Cipher algorithm and in the steganography, process using the algorithm (LSB) Least Significant Bits. The merger of the two techniques resulted in a better new digital image security system and increased the value of MSE, PSNR and Execution time. Then the test results in the evaluation using BER and histogram analysis. Good audio quality has a minimum value of 30 dB PSNR. In the embedding process using combinations of vigenere and LSB methods, Audio 15 is the best audio compared to other audio. Audio 15 has a smaller MSE (0.001656) value and a larger PSNR (124.138499) value than any other audio when embeded messages *.txt file with character 4096.

Analysis of Four Historical Ciphers Against Known Plaintext Frequency Statistical Attack

The need of keeping information securely began thousands of years. The practice to keep the information securely is by scrambling the message into unreadable form namely ciphertext. This process is called encryption. Decryption is the reverse process of encryption. For the past, historical ciphers are used to perform encryption and decryption process. For example, the common historical ciphers are Hill cipher, Playfair cipher, Random Substitution cipher and Vigenere cipher. This research is carried out to examine and to analyse the security level of these four historical ciphers by using known plaintext frequency statistical attack. The result had shown that Playfair cipher and Hill cipher have better security compare with Vigenere cipher and Random Substitution cipher.

A new RGB image encryption using generalized Vigenére-type table over symmetric group associated with virtual planet domain

The primary aim of this paper is to provide an efficient encryption algorithm for RGB images. A new, fast, and secure RGB image encryption algorithm using generalized Vigenere table over the symmetric group $S_{n}$ associated with Virtual Planet Domain (VPD) is proposed. Also a new method to generate random key space using generalized Vigenere cipher is introduced. Randomness of the proposed key space has been verified by using NIST statistical test suite. A formula for the key space has also been obtained and it is shown that this key space resists brute force attack. The VPD has been designed to encode RGB image into VPD, which provides a fine interlacing among binary bit for each pixel. The proposed algorithm has been tested on standard RGB images. Robustness of the proposed algorithm has been successfully verified by using commonly known attacks (such as, differential, cropped, and noise, entropy attacks). Finally, the proposed technique has been compared with other existing algorithms and the data (shown in tables) confirm that the proposed algorithm is competitive and can resist exhaustive attacks efficiently.

Vigenere cipher algorithm modification by adopting RC6 key expansion and double encryption process

Modifications to Vigenere cipher are possible to make in order to be effective and efficient of this algorithm. In this study, we tried to modify Vigenere by exploiting RC6 key expansion to generate new keys used for encryption process, RC6 is a well-known as a modern cryptographic algorithm. If the RC6 Key expansion process will generate the S key as much as 2r+4, in this research will produce S Key as long as the plaintext length. Then for the encryption process done twice. The results show that the method proposed producing completely different key sequences (not repetitions like Vigenere cipher) can also produce an average avalanche effect of 17 bitsof the total 64 bits or about 26,56 %, better than the standard Vigenere which only reached 7.81%, but unfortunately no better than Vigenere with the RC6 key expansion without twice encryption process that reaches31.25% and of RC6-8/5/b with 35.94%.

Implementasi Metode Algoritma KVC Untuk Pengamanan Pesan

Communication through message media or sms, Sort Message Service is not a point to point message but that communication by sent through sms network and stored in database operator. Message security on the network is threatened be read by people who are not responsible or called intercept. Therefore it will be develop some application on the mobile phone to modify the message be come a ciphertext and the information content of the messageis not known by others. In this application, the system encrypts the message into ciphertext using the key entered by the sender and then it will be sends to the destination number. For accepting the message, system will decrypt chipertext become plaintext using key by sender, then the message can be read by receiver. This application can be used by some one who wants to sending the secret message and very important without fear if the information can read by others. This application uses vigenere cipher method. The main parameter is the key and the message itself.

Aplikasi Pembelajaran Algoritma Affine Cipher Dan Vigenere Cipher Menggunakan Metode Computer Assisted Instruction

Learning is a process of communication between teachers and students. Cryptographic learning is very important for computer students to know the ways to secure data. Then learning is needed about data security, namely using cryptographic methods with the Affine Cipher algorithm and vigenere cipher. The Affine Cipher algorithm is a form of classical cryptography that uses the nature of substitution in the process of encoding data where the process is done by multiplying each plaintext value by a value and adding it with a shift. Vigenere Cipher algorithm is one form of classical cryptography with substitution techniques. Computer Assisted Instruction (CAI) is a computer for presenting learning material that aims to make students more active in learning material in the use of computer media. In its development Computer Assisted Instruction (CAI) has five learning system models namely tutorial models, practice models and exercises, problem solving models, simulation models, and game models, the advantages of Computer Assisted Instruction (CAI) in education can increase student motivation in learning, improve student understanding in the material presented.

Combination Vigenere Cipher and One Time Pad for Data Security

Data security can be done with many techniques such as steganography and cryptography, the use of cryptographic algorithms such as Vigenere Cipher and One Time Pad to secure the data is expected to make the data difficult to be known by irresponsible parties, the test obtained results that the ciphertext results of different combinations and strong enough because the key used must match the length of the plaintext.

Image encryption using vigenere cipher with bit circular shift

Cryptography is a method of securing text data, images and sound in order to secure its confidentiality and to minimize data stealing, attack, etc. The purpose of this study is to improve classic Vigenere cipher using bit circular shift on image encryption. This experiment uses both RGB and grayscale images as samples and shows that Vigenere cipher with bit circular shift has better performance when encrypting an image both visually and its randomness. It is obtained the MAE values of images of final encryption process are 81.702637 of RGB and 73.678756 of grayscale, and the final decryption process of 0 for both images. The randomness of images of the final encryption process is shown by its correlation coefficient values; it is 0.033857 of RGB and -0.058501 of grayscale.

Kriptanalisis Algoritma Vigenere Chiper dengan Algoritma Genetika untuk Penentuan Kata Kunci

Cryptanalysis is the art to solve without key ciphers, in contrast to cryptography, namely to maintain the confidentiality of data by encode a plaintext. Vigenere ciphers is one of the kriptanalisis algorithm. Brute force attack and exhaustive attack is a technique of kriptanalisis vigenere ciphers, but less optimal in result. In my research this time proposed a way of solving the secret key (Cryptanalysis), using a genetic algorithm on text Indonesia-speaking ciphers. .The first step in this study performed a chromosome design would be the length of the keyword, the method used is the coincidence index (IOC), the IOC values with text Indonesian is 0,075. To get the value of fitness done the search weights by comparison Word decryption of keywords with Indonesian Language Dictionary. Genetic algorithms will seek all possible keywords, there are genetic algorithms in the process of reproduction includes crossover, mutation and elitisme. There are parameters that are included in the process of a keyword search that is the value of the probability of crossover, mutation probability and population, number of the parameter that you want to optimize to get keywordsThis analysis is performed on the five scenarios with any combination of parameters, number of characters chipertext and two types of different keywords. After 1000 times testing with a combination of parameters generated 467 the data successfully guessing keywords within approximately 60 minutes. With the testing of two different keywords and two different ciphers text amount done by as much as five times the test showed that both have the value of the average test time the fastest standard deviation value. After an analysis of the results of the research, the optimal parameters is obtained with a value Pc 0.09, Pm 0.3 and Pop_size 20.Keywords : Cryptanalysis, Genetic Algorithm, Vigenere Chiper, Index Coincidence.

A lightweight and efficient encryption scheme based on LFSR

Privacy and trust in wireless networks have attracted plenty of attention in the information age. Various types of high-complexity encrypt algorithms are exploited for improving the security of the communication, such as providing security in global system for mobile (GSM) communication cell phones. This paper proposes a new algorithm, which combines the Vigenere cipher, linear feedback shift register (LFSR) and one-time pad (OTP) together to reduce the computational complexity and improve the system security. Benefitting from the combination of these advantages, our proposed algorithm makes and attack process more complicated. Particularly, when the Vigenere cipher is expanded to including alphabets, symbols and numbers, it will become safer and more difficult to break just by using frequency or brute force methods, etc. The alphabet entropies of plain and cipher texts are calculated and compared. In addition, the cipher text space is further expanded. The numerical results, obtained through Java programming language, illustrate that the proposed cryptosystem is safer than the conventional Vigenere cipher.

Implementation of Rivest Shamir Adleman Algorithm (RSA) and Vigenere Cipher In Web Based Information System

Data security and confidentiality is one of the most important aspects of information systems at the moment. One attempt to secure data such as by using cryptography. In this study developed a data security system by implementing the cryptography algorithm Rivest, Shamir Adleman (RSA) and Vigenere Cipher. The research was done by combining Rivest, Shamir Adleman (RSA) and Vigenere Cipher cryptographic algorithms to document file either word, excel, and pdf. This application includes the process of encryption and decryption of data, which is created by using PHP software and my SQL. Data encryption is done on the transmit side through RSA cryptographic calculations using the public key, then proceed with Vigenere Cipher algorithm which also uses public key. As for the stage of the decryption side received by using the Vigenere Cipher algorithm still use public key and then the RSA cryptographic algorithm using a private key. Test results show that the system can encrypt files, decrypt files and transmit files. Tests performed on the process of encryption and decryption of files with different file sizes, file size affects the process of encryption and decryption. The larger the file size the longer the process of encryption and decryption.

A combination of vigenere algorithm and one time pad algorithm in the three-pass protocol

Cryptography is the method of delivery of messages in secret, thus only the intended message recipient can read the message. In this study, the cryptographic algorithms which used are Vigenere Cipher and One Time Pad. However, the security of both algorithms depends on the security of the algorithm key. Three-Pass Protocol is a scheme of work that lets two people exchange secret messages without doing a key exchange. So, both the symmetric cryptographic algorithms combined on a Three-Pass Protocol scheme. The purpose of the combination of two algorithms in the three-pass protocol is to secure the image message without exchange key process between sender and recipient. The results of the research and testing using GetPixel pointed out that safeguarding the image file using the combination of Vigenere Cipher and One Time Pad algorithm restores the original image files intact. Therefore, it meets the parameters of the integrity of the data. The test results based on time parameter shows that time of the program execution process is directly proportional to the size of the image. The result is related with the formula which calculate every pixels of the the image.

Aplikasi Pengamanan Data Gambar Dengan Menerapkan Algoritma Vigenere Chiper

The security and confidentiality of data is very important considering the rapid development of technology at this time which allows the emergence of new techniques that are misused by certain parties that can threaten security from data that are considered insignificant.
 Cryptography is a field of science to maintain image security. Cryptography has been implemented in many ways. The way it works is to change the original data that can be understood / read by humans (plaintext) to other forms that cannot be understood / read by humans (ciphertext). The process of transforming plaintext into chiperteks is termed encryption. While the process of returning a chipertext message to plaintext is termed decryption.
 Vigenere Cipher is an asymmetric cryptographic algorithm, where the key used to encrypt is different from the one used to decrypt. Vigenere Cipher is a cryptographic algorithm that uses letters and numeric values. Vigenere Cipher requires three steps in the process, namely key generation, encryption, and decryption. The process of encryption and decryption is almost the same process.

Vigenère scores for malware detection

Previous research has applied classic cryptanalytic techniques to the malware detection problem. Specifically, scores that are based on simple substitution cipher cryptanalysis have been considered. In this research, we analyze two malware scoring techniques based on the classic Vigenere cipher. Our first approach relies only on the index of coincidence (IC), which is used for example, to determine the length of the keyword in a Vigenere ciphertext. To compute the IC, we consider both the Kasisky Test and Friedman’s Test. We also consider a score based on a more complete cryptanalysis of a Vigenere cipher, where the IC calculation is the first step. We find that both of these scores outperform comparable malware scores in selected cases.

Three-Pass Protocol Implementation in Vigenere Cipher Classic Cryptography Algorithm with Keystream Generator Modification

Vigenere Cipher is one of the classic cryptographic algorithms and included into symmetric key cryptography algorithm, where to encryption and decryption process use the same key. Vigenere Cipher has the disadvantage that if key length is not equal to the length of the plaintext, then the key will be repeated until equal to the plaintext length, it course allows cryptanalysts to make the process of cryptanalysis. And weaknesses of the symmetric key cryptographic algorithm is the safety of key distribution factor, if the key is known by others, then the function of cryptography itself become useless. Based on two such weaknesses, in this study, we modify the key on Vigenere Cipher, so when the key length smaller than the length of plaintext entered, the key will be generated by a process, so the next key character will be different from the previous key character. In This study also applied the technique of Three-pass protocol, a technique which message sender does not need to send the key, because each using its own key for the message encryption and decryption process, so the security of a message would be more difficult to solved.

Collaborative Encryption Algorithm Between Vigenere Cipher, Rotation of Matrix (ROM), and One Time Pad (OTP) Algoritma

Collaborative Encryption Algorithm Between Vigenere Cipher, Rotation of Matrix (ROM), and One Time Pad (OTP) Algoritma

IMPLEMENTASI KRIPTOGRAFI VIGENERE CIPHER DENGAN PHP

Abstract - This research was conducted to create a cryptographic implementation of vigenere ciphers. This system is designed by analyzing the descriptive method, and the comparative method. After analysis, modeling is done with UML (Unified Modeling Language) and the design of vigenere cipher cryptography system with text encryption and decryption can be programmed using PHP software. The results of this study are an implementation of the vigenere cipher cryptographic system with PHP. Keywords - Cryptography, Vigenere Cipher, Encryption - Decryption, Text, PHP.

A FIRST CRYPTOSYSTEM FOR SECURITY OF TWO-DIMENSIONAL DATA

In this paper, we present a novel technique for security of two-dimensional data with the help of cryptography and steganography. The presented approach provides multilayered security of two-dimensional data. First layer security was developed by cryptography and second layer by steganography. The advantage of steganography is that the intended secret message does not attract attention to itself as an object of scrutiny. This paper proposes a novel approach for encryption and decryption of information in the form of Word Data (.doc file), PDF document (.pdf file), Text document, Gray-scale images, and RGB images, etc. by using Vigenere Cipher (VC) associated with Discrete Fourier Transform (DFT) and then hiding the data behind the RGB image (i.e. steganography). Earlier developed techniques provide security of either PDF data, doc data, text data or image data, but not for all types of two-dimensional data and existing techniques used either cryptography or steganography for security. But proposed approach is suitable for all types of data and designed for security of information by cryptography and steganography. The experimental results for Word Data, PDF document, Text document, Gray-scale images and RGB images support the robustness and appropriateness for secure transmission of these data. The security analysis shows that the presented technique is immune from cryptanalytic. This technique further provides security while decryption as a check on behind which RGB color the information is hidden.

Security Enhancement of English Text using PRATHALA TABLE of ALPHANUMERALS

PRATHALA TABLE of ALPHANUMERALS is a 62 x 62 matrix table developed by the authors for cryptographic purpose. In this paper a newly developed table of ALPHANUMERALS is proposed using Vigenere cipher logic. About (62!)62 tables can be generated. Each table is a 62 x 62 matrix. At any point of time any one of the tables can be used for encryption. The same table is to be regenerated and used for decryption. Experiments conducted shows that PRATHALA TABLE of ALPHANUMERALS method is much more secure than Vigenere Table Method.

Arabic Text Cryptanalysis Using Genetic Algorithm

In this paper a Genetic Algorithm (GA) is proposed to attack an Arabic encrypted text by Vigenere cipher. The frequency of occurrence of Arabic letters has been calculated by using the text of the holy book of Quran, since it has rich language features compared to many other books. The algorithm is tested to find the key letters for different ciphertext sizes and key lengths. The results shows 100% correct letters retrieved from medium size ciphertext and short key length, while 90% of the ciphertext is retrieved from long ciphertext and medium key length, and 82% of the ciphertext is retrieved from long ciphertext and long key.