Hill Cipher is a one of the symmetric key cryptography algorithm that using an invertible matrix with an order n×n as a key to encrypt and decrypt plaintext. Meanwhile, ElGamal is other asymmetric key cryptography algorithm that use the complexity of discrete logarithms in the encryption and decryption process. In this study, the authors are interest in combine the Hill Cipher and ElGamal algorithms to secure text messages. The author use the matrix as a symmetric key and converts the plaintext in the table of ASCII 256. Then encrypt using the Hill Cipher algorithm which results the ciphertext from messages and ElGamal algorithm results the ciphertext of the symmetric key. In processing decryption using the ElGamal algorithm to determine the symmetric key that will be used as a key in the decryption process with the Hill Cipher algorithm so that the original plaintext is obtained. Then the results obtained are that the combination of the Hill Cipher and ElGamal algorithms to secure text messages can be done it well.
<p class="AbstractText">Multimedia provides opportunities for educators to develop learning techniques so as to produce maximum results, with multi media it is hoped that they will be easier to determine with what and how students can absorb information quickly and efficiently. Until now, interactive learning media has not been developed optimally in Indonesia. One obstacle in the development of interactive learning media is the lack of mastery of interactive media development technology by teachers, so the development of interactive learning materials with computers is less than optimal. This online-based learning media development training that will be developed and applied for teachers at the Al Yasini Pasuruan Foundation is expected to provide new insights in making instructional media, given the ability of this program in terms of making animations for attractive online-based learning media in a relatively easy way . With the mastery of online-based learning media by the teachers at the Al Yasini Pasuruan Foundation, it is hoped that it will trigger students' interest to be more enthusiastic in following the lessons, and ultimately will improve the overall quality of learning.</p>
DNA Cryptography is one of new algortihm in cryptography that is used to encrypt the data by converting the DNA code into binary code. Encryption process is expected to produce a random and unreadable ciphertext. This research aims to determine the result of encryption frequency analysis of the ciphertext obtained from the encryption process using DNA Cryptography and Digraph Transformation algorithm. The formation of a symmetric key is carried out for the encryption and decryption process in DNA Cryptography, and modular arithmetic in Digraph Transformation algorithm. The encryption process produces ciphertext in the form of letters and symbols because if involves the use of an ASCII table. Frequency analysis is done by comparing the frequency of occurence of letters in the ciphertext with frequency of occurence of letters in English. The conclusion for this research is that the ciphertext looks random, not easy to read, and hard to guess. For the future work, researcher can change the choice of binary code combinatory in DNA Cryptographic algorithms, increase the character vocabulary in the Digraph Transformation algorithm, and use various languages to code.
During the Covid-19 emergency, schools have implemented learning activities in the midst of an emergency according to the conditions and creativity of each school, where students learn from home with guidance from teachers and parents. In this activity, it is directed to achieve the objectives of this training, the instructors get additional knowledge of knowledge about making interactive online-based multimedia learning media and can create interactive online-based multimedia learning media. The methods applied in this activity are direct training and practice. In this training, several activities will be given including the presentation of material and the practice of making media by the training participants. Furthermore, the learning media that has been done by the teachers are presented in front of the class to provide input to each other for the improvement of the learning media that has been made. The result of this activity is a YouTube channel containing instructional videos made by SD Ma'arif Ketegan teachers.
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