Signcryption dengan Algoritma RSA dan Skema Tanda Tangan Digital Inam – Kanwal – Zahid – Abid

Abstract

In today's digital age, the need for secure communication is increasingly critical given the ever-increasing threats to privacy and data integrity. The fundamental need for a comprehensive security mechanism prompted the research to design a system that can protect data confidentiality, guarantee message integrity, and provide strong authentication. This research implements a signcryption system that combines RSA algorithm encryption with Inam-Kanwal-Zahid-Abid (IKZA) digital signature scheme to provide secure digital communication. The signcryption system in this study uses the encrypt-then-sign method, where the RSA algorithm is used for the encryption and decryption process, while the IKZA digital signature scheme is implemented for the signing and verification process. The signcryption process shows efficiency even for long messages (500 characters), with an average time of 0.017964 seconds for encrypt- then-sign and 0.03491 seconds for verify-then-decrypt. Performance testing shows strong resistance to brute-force attacks, with 30-bit numbers taking an average of 148.4 seconds to factorize, while 35-bit numbers cannot be factored within the 3600-second time limit. The proposed signcryption system successfully proved its effectiveness on a stand alone computer in providing digital communication security.