Pemfaktoran Bilangan Prima pada Algoritme ElGamal untuk Keamanan Dokumen PDF
Abstract: Utilization of
document files does not guarantee the security of those documents. There are
acts of plagiarism of txt and doc files. Converting files into PDF can help
secure the files, because PDF can not be easily plagiarized and a password can
be embedded into the files. But, nowadays, PDF files also can be modified by
other parties, thus, reducing the security of the files. This paper utilizes
factor of prime and random numbers in cryptography using ElGamal algorithm to
encrypt PDF plaintext documents into cipher text. This research uses
experimental research with some experiments of encryption and decryption. The
data analysis type is quantitative with non-parametric statistic. This
technique is implemented to analyze the final result of experiments. The
research is conducted by doing 20 times encryption using random keys. The
result shows the successfulness of encryption process. The process begins by
converting each character from the plaintext using ASCII table to a decimal
number. ElGamal algorithm calculation is then applied using prime and random
numbers to generate the keys. This process makes ElGamal algorithm superior to
other algorithm. The result is character value used in the decryption process.
The output of the encryption process is an encrypted PDF document (ciphertext).
The results show that the combinations of prime and random numbers are
successfully generated in the encryption process using ElGamal algorithm.
Keywords: Algoritme ElGamal,
Enkripsi, Dekripsi, Bilangan Prima, Bilangan Acak, Dokumen PDF, Kriptografi
Penulis: Aisyatul Karima, L.
Budi Handoko, Ari Saputro
Kode Jurnal: jptlisetrodd170486
