Implementasi Algoritma SHA-3 Dan ElGamal Untuk Otentikasi Piagam Penghargaan Berbasis Digital Signature

Abstract

The rapid development of technology today is very possible for the occurrence of various forgeries and frauds that
are carried out to take profits unilaterally. One of them is the falsification of a certificate of appreciation that can
be easily carried out by irresponsible parties. An award certificate is an important file that proves the
achievements of a person in a particular activity or competition. This is what gives rise to a lot of people who try
to forge certificates of appreciation for their personal interests, both work and education. Therefore, a system is
needed to test the authenticity of the award charter. With a series of testing steps carried out, it can be concluded
whether the award certificate is authentic or not. To avoid falsification of document files, it is necessary to apply
a digital signature with a cryptographic method. Digital signatures or better known as digital signatures can help
test the authentication of a document, especially a certificate of appreciation. When the digital signature has been
applied to the award certificate, the award recipient can check whether the file is authentic or has been modified.
The application of digital signatures goes through 2 stages, namely the signing and verification process. Signing
is the stage of forming a digital signature by combining the SHA-3 and ElGamal algorithms. The authenticity of
the file can be seen by carrying out the verification process, which is the process of comparing the hash value of
the received file with the actual file hash value. This research produces an analyzation about process of
authentication using digital signature.