Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Jurnal Informatika
Willy Sudiarto Rahardjo
Program Studi Teknik Informatika Fakultas Teknologi Informasi Universitas Kristen Duta Wacana Yogyakarta
Computer Science & IT

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
IMPLEMENTASI ALGORITMA TWOFISH DANI LEAST SIGNIFICANT BIT (LSB) UNTUK PENYEMBUNYIAN FILE TEXT PADA CITRA DIGITAL Devri Riza Setyawan; Willy Sudiarto Rahardjo; R. Gunawan Santosa
Jurnal Informatika Vol 10, No 1 (2014): Jurnal Teknologi Komputer dan Informatika
Publisher : Universitas Kristen Duta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6153.884 KB) | DOI: 10.21460/inf.2014.101.324

Abstract

Security and confidentiality of information are considered a requirement in today's communication media. Many people have used Internet to share and distribute confidential information. On the other hand, many malicious activities attempts to steal those information by irresponsible parties. Therefore, information must be secured and converted into another form before it is sent to the destination by the use of cryptography and steganography. We developed a program to secure this information, by using Twofish and Least Significant Bit algorithm to encrypt secret messages and then insert it into an image file. By combining these two methods, we can achieve higher levet of information security.The information encoded with twofish algorithm will change the fite size stightly. This changes are caused by the use of padding. In addition, both of the output image are not resistant by some manipulation operations. The output of the system in BMP format does not change the file size after insertion process, while PNG format will have a stightty dffirence infile size due to processing in bitmap mode.
IMPLEMENTASI METODE REST REQUEST PADA YOUTUBE WEB SERVICE UNTUK REPRESENTASI INFORMASI BERBASIS TIMELINE Ryan Peterzon Hadjon; Restyandito Restyandito; Willy Sudiarto Rahardjo
Jurnal Informatika Vol 10, No 1 (2014): Jurnal Teknologi Komputer dan Informatika
Publisher : Universitas Kristen Duta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6726.168 KB) | DOI: 10.21460/inf.2014.101.321

Abstract

Developing video search application using the service of a third party data (resources) provider is a complex process. Therefore to obtain the desired data, an efficient communication method is needed. This research explored the use of REST request communication method by using URL to identify video resources through YouTube API data. Video data that were identified will then be processed to get more relevant video search. Relevancy of the search result was determined by applying the mechanism of relevance-based system and user-based system. Based on the experiment analysis, it is concluded that key word has an important role in determining the relevance of the search result, as it is needed for timeline based representation.
Co-Authors Devri Riza Setyawan Raden Gunawan Santosa Restyandito Ryan Peterzon Hadjon