期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2020
卷号：98
期号：13
页码：2628-2637
出版社：Journal of Theoretical and Applied
摘要：Image files are vulnerable to being fabricated, modified, and duplicated, which violate the copyright. Therefore, it is needed Rabin cryptography method for securing and assuring the confidentiality of the image file. Rabin cryptography algorithm is an asymmetric algorithm. The advantage of this algorithm is a simple encryption process so that it can reduce processing time, even though the used resource is limited. Encryption process in the Rabin algorithm causes enlargement of the data size, moreover, the capacity of the image file that tends to be large, it can cause to the slowing down of the information exchange process. So it is needed Fibonacci codes method to reduce or compress the data size. Fibonacci codes is a compression algorithm that uses an array of the Fibonacci integer to code the bit value from the data or file which compressed. In this research, the writer combines the Rabin cryptography algorithm for securing image files and Fibonacci codes for compressing data. This research will be done in two schemes test. The first scheme which will be done that the image file is encrypted first with Rabin cryptography algorithm, then the result of encryption is compressed with the algorithm of the Fibonacci code. And the second scheme which will be done that image file is compressed first with Fibonacci codes, then the result of the compression is encrypted with the Rabin cryptography algorithm. Image file to be tested with extension are *.JPG, *.PNG, *.BMP. System implementation uses C# programming language. The result of this research shows that the Rabin cryptography method can secure originality and confidentiality of data with the first scheme and the second scheme, whereas the Fibonacci codes method is ineffectively to reduce data size with extension *.JPG and *.PNG in the second scheme. Fibonacci codes method produce RC (Ratio Compression), CR (Compression of Ratio), and SS (Space Saving) with each values are 0.89, 115,52%, -15,53% in average. While in file with *BMP extension Fibonacci codes method can be used effectively to reduce the data size, where this method Rc = 1,4364, Cr = 70,98%, and SS = 27,47 % in average.
