PAPER • OPEN ACCESS
The implementation of computer based instruction model on Gost
Algorithm Cryptography Learning
Abstract. The objective of this study is to develop learning media by using
the Computer Based Instruction (CBI) model for GOST algorithm cryptographic
material (Gosudarstvennyi Standard). Besides, the study serves to present
learning using computer media, especially in the Informatics Engineering study program. The method used in this study
uses the Research and Development (R & D) method. The results of this
development research are learning media products in the form of tutorial CDs
with the contents of the material: GOST Cryptographic Theory, Encryption
Process and Decryption process using alphabet text data. Based on the results
of the application and testing of the program, it can be concluded that this
application is easy to use. Learning the Gost algorithm in the encoding method
utilizing the Computer Based Instructions (CBI) method helps to understand the
material and facilitate the learning process.
1. Introduction
In cryptography, there are many algorithms found, one of which is
the Gost Algorithm. Gost is an abbreviation of "Government Standard"
which means government standard, Gost algorithm is a chipper algorithm.
Cryptography The Gost algorithm is Modern cryptography, in contrast to classics
which are generally character oriented, modern bit-oriented encoding because
current encoding uses computer media to process messages. The message in a
shared password is not always a series of characters; it can be a series of
bits, such as videos or image files.
Computer Based Instruction (CBI) is a teaching material arranged systematically and designed with a programming language or with software. A computer system presents a series of teaching programs by interacting with a computer system, the need for the availability of learning programming that utilizes the Learning Method Computer-Based Instruction (CBI) increasing and using strategic learning methods with materials, exercises, questions, quizzes. Learning media that is packaged in a computer program aims to help understand the material to facilitate the teaching and learning process.
In connection with the description of the background
of the above problems can be formulated the issues to be studied include how
cryptographic learning is easy to understand by applying the Computer-Based
Instruction (CBI) model in cryptographic education with multimedia-based Gost
Algorithm material. The aim is to facilitate students or students in the
cryptographic learning of the Gost Algorithm in learning the stuff and
providing convenience in the teaching and learning process.
This study uses research and development models or Research and
Development (R & D). The R & D method is a research used to produce
specific products and 10 (ten) stages, namely
(1) Analysis and
Potential Problems, (2) data collection, (3) product design, (4) design
validation, (5) design revision, ( 6) product trials, (7) product revisions,
(8) usage trials, (9) product revisions and (10) mass production. But in this
study, it only uses eight stages because the product made is not mass produced.
In this study, the instrument is used to collect data
that will be used as a reference assessment by experts on the products
produced. The research instruments used in this study are as follows:
1.
Validation sheet, this instrument is used to
determine the feasibility of the media that has been produced and obtain advice
from media experts, content experts, and design experts to correct the
shortcomings of the learning media produced
2.
Questionnaire on student responses, this research
instrument is used to determine student responses to the press that has been
produced. For the grid, the student response sheet is the same as the
validation sheet because the object being observed is the same.
3.
Learning outcomes, Tests are ways that can be used
or procedures that need to be taken in the framework of measurement and
research in the field of education.
Assessment of the validity of learning media is done by giving responses to questionnaires with very valid, less valid and invalid criteria. While the evaluation of student responses to learning media is done by responding to surveys with rules that are very good, good, not good and not good. To analyze the validator answers and student responses used descriptive statistics on rating results, which are described as follows:
The learning process is a process in which there are students,
educators and learning resources in a learning environment. Learning activities
will run smoothly if the three aspects exist. Submission of sound and more
specific material referring to the learning objectives will make students feel
interested in learning the content delivered by the teacher. In addition to
teaching materials to students, it is also best to do exam tests following the
material presented to find out how understanding students understand about the
material presented by educators, so that the learning objectives can be
measured or not achieved.
3.1.
Cryptography and
Gost Algorithm
Cryptography is the science and art of maintaining the
confidentiality of messages by encoding them in a form that cannot be
understood anymore. Cryptography is used for important communication security.
Gost or Gosudartstavany Standard, meaning government
standard namely encryption algorithm and developed in 1970, the gost was made
by Soviet as an alternative to the United States. DES standard encryption
algorithm, GOST is structurally similar to DES. The GOST structure uses the
Fietsel network. One GOST round for Ki-1 rounds, private ki key is used. One
Gost round with DES is considered in the formula below:
Li = Ri-1…................. (1)
Ri =
Li-1 Å f(Ri-1,Ki)……(2)
3.2
Key Generation Process
The generation
of the internal key is done by dividing the 256-bit external key (k1, k2, k3,
k4,
..., k256) into
eight parts, each of which is 32 bits long. The division is as follows:
K0 = (k32, …….
,k1)
K1 = (k64, ……. ,k33)
K2 = (k96, ……. ,k65)
K3 = (k128, ……. ,k97)
K4 = (k160, ……. ,k129)
K5 = (k192, ……. ,k161)
K6 = (k224, ……. ,k193)
K7 = (k256, ……. ,k225)
3.3
Encryption and
Decription Process
This algorithm
explains the encryption and decryption process and is a continuation of the
compose page.
This main menu
displays the menu options that you want to run or use. In the main menu there
are four menu options, namely:
a.
Tutorial
In this tutorial
menu, some materials discuss cryptographic learning. The tutorial menu can be
seen in Figure 2
b.
Exercise
In this menu,
the items that discuss cryptography and GOST algorithm are displayed, the menu
display can be seen in the picture below
c.
Game
In this menu,
there are only practice questions changing the plaintext to the ciphertext form
in which the timeout is given.
d.
About Me
This menu will display the name of the program maker The
menu can be seen from figure below:
In closing the
discussion in the study, the authors conclude as well as provide advice to
readers who use the algorithm
Gost's cryptographic learning
application. The obtained
[1] J. Simarmata et al., “Learning Application of
Multimedia-Based-Computer Network Using Computer Assisted Instruction Method,” Int. J. Eng. Technol., vol. 7, no. 2.13,
pp. 341–344, Apr. 2018.
[2] S. Sriadhi, S. Gultom, R. Restu, and J. Simarmata, “The Effect of Tutorial Multimedia on the Transformator Learning Outcomes Based on the Students ’ Visual Ability The Effect of Tutorial Multimedia on the Transformator Learning Outcomes Based on the Students ’ Visual Ability,” IOP Conf. Ser. Mater. Sci. Eng. 384 012059, 2018.
[3] J. Simarmata, “Prototype Application Multimedia Learning for Teaching Basic,” vol. 7, pp. 264–266, 2018.
[4] T. Limbong, P.
Manullang, and E. Napitupulu, “Dikte Test Applications (IMLA) Using Computer
Assisted Instruction (CAI) Model.”
[5] T. Limbong et al., “The Implementation of
Multi-Objective Optimization on the Basis of Ratio Analysis Method to Select
the Lecturer Assistant Working at Computer Laboratorium,” Int. J. Eng. Technol., vol. 7, no. 2.13, pp. 352–356, Apr. 2018.
[6] J. Simarmata, A.
Djohar, J. P. Purba, and E. A. Djuanda, “IMPLEMENTASI MODEL PEMBELAJARAN
BERBASIS BLENDED LEARNING UNTUK MENINGKATKAN HASIL BELAJAR SISWA.”
[7] J. Simarmata, A.
Djohar, J. P. Purba, and E. A. Djuanda, “Perancangan Prototype Model
Pembelajaran Berbasis Blended Learning Untuk Meningkatkan Proses Pembelajaran,” 2017.
[8] J. Piaget and M.
Cook, The origins of intelligence in
children, vol. 8, no. 5. International Universities Press New York, 1952.
[9] D. Napitupulu et al., “Analysis of Student
Satisfaction Toward Quality of Service Facility,” J. Phys. Conf. Ser., vol. 954, no. 1, 2018.
[10] J. Simarmata, A.
Djohar, J. Purba, and E. A. Juanda, “Design of a Blended Learning Environment
Based on Merrill’s Principles,” J. Phys.
Conf. Ser., vol. 954, no. 1, 2018.
[11] R. M. Gagne and L. J. Briggs, Principles of instructional design. Holt, Rinehart & Winston, 1974.
[12] G. Gunawan et al., “Mobile Application Detection of Road Damage using Canny Algorithm,” in Journal of Physics: Conference Series, 2018, vol. 1019, no. 1, p. 12035.
[13] J. Simarmata,
“Pengenalan Teknologi Komputer dan Informasi,” Yogyakarta Andi, 2006.
[14] J. Simarmata and
T. Chandra, “Grafika Komputer,” Yogyakarta
Penerbit Andi, 2007.
