IMPLEMENTING DIGITAL SIGNATURE WITH RSA AND MD5 IN SECURING E-INVOICE DOCUMENT

Abstract

Digitization of business processes in organizations has been widely applied in this era of society 5.0. One of them is used in making electronic invoice (e-invoice) documents. Activities within the organization can't be separated from the transaction process which is the main business process. Therefore, it is important to maintain the authenticity of invoice data so that there is no risky value change in falsifying invoice data. By utilizing a cryptographic system, digital signatures can provide data security services in the form of authentication and data integration that can detect the authenticity of data. In this study, the digital signature was built by applying the MD5 hashing function and the asymmetric RSA algorithm. Simulation of digital signatures on e-invoice documents is carried out using open-source cryptography software, namely CrypTool version 2.1. The digital signature system simulation design is through hash process using MD5 algorithm, key generation process with RSA algorithm, encryption and decryption process. The results of the digital signature simulation using e-invoice documents show that the results of the MD5 document hash and RSA ciphertext decryption have the same value. It can be interpreted that the document is original and has not changed the data.