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Currently, every electronic transaction involving important information requires a digital signature (DS). The procedure used to prove the authenticity of the DS, the authenticity of the sender's identity, and the non-repudiation of the DS can be carried out with authentication techniques. Signing the DS is done using a hash function. The message digest (MD) generated by the hash function (ℎ) will be encrypted by reversing the roles of the private and public keys in the Rivest-Shamir-Adleman (RSA) cryptographic algorithm. The main objective of this research is to propose DS authentication using the RSA algorithm. The signature is signed through MD encryption using the RSA algorithm using a private key PR{d, n}. The signature is verified by decrypting the DS using the public key PU{e, n}, thus getting the ℎ value. The h value is compared with the ℎ' value obtained from the value of the DI hash function of the checked DS. The result of this research is that the signature is verified to be authenticated, if the result is h = h′, then means that the received DS is genuine and comes from the signed user (user authentication), never modified (data integrity), and the sender can't deny the signature (non-repudiation). [ABSTRACT FROM AUTHOR]

One of the information media that can be accessed widely and quickly is using a web-based information system. A website requires web developer so that the web is always updated in real-time. In fact, not all organizations have web developers who keep websites updated continuously and are dynamic. The combination of web technology and database called web-based, so that web can be dynamic web. This makes for the easier development and maintenance of larger-scale Web applications. Dynamic web-based information system design requires a database modeling and design. The major objective of this study is to propose a web-based information system the offices bureau of student affairs with database modeling and design to aid student affairs bureau in capturing, storing, sharing, and publish activities and achievements of students. In this respect, a tool named Sikaromah (Sistem Informasi Kantor Biro Kemahasiswaan). Where users can automatically update the web page content without relying on web developer to edit a web page each time a new content and page is added. A working prototype of the system has been developed based on Hypertext Markup Language, Hypertext Preprocessor and MySQL. The system prototype is built on a n-tier client server architecture based. [ABSTRACT FROM AUTHOR]