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All Journal Journal of Fundamental Mathematics and Applications (JFMA) JURISTA : Jurnal Hukum dan Keadilan
Ali, Saifullah
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Religion Humanities Decision Sciences, Operations Research & Management Law, Crime, Criminology & Criminal Justice Social Sciences

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THE APPLICATION OF MURABAHAH CONTRACTS IN THE INSTALMENT SERVICES OF DHUAFA PARTNER COOPERATIVES IN INDONESIA Ali, Saifullah; Amalia, Zalva; Yusuf, Yusriaina
JURISTA: Jurnal Hukum dan Keadilan Vol. 7 No. 2 (2023): JURISTA: Jurnal Hukum dan Keadilan
Publisher : Centre for Adat and Legal Studies of Aceh Province (CeFALSAP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/jurista.v7i2.70

Abstract

This article aims to examine the application of Murabahah contract in Mitra Dhuafa Cooperative, in Kembang Tanjung District, Pidie Aceh, Indonesia. This study is written with a conceptual approach, namely with the type of research is doctrinal legal research. The results showed that the procedure for applying the murābaḥah contract for instalment services of Mitra Dhuafa Cooperative in Lancang Village, Kembang Tanjung District was carried out in two stages. Firstly, members apply for financing with the conditions that they must be women with low income, a group of at least 10 members, business financing, with the permission of their husbands or family members, complete photocopies of KTP, KK, details of the items to be purchased. Secondly, the implementation of the murābaḥah contract. At this stage two contracts are executed, first the wakalah contract, which is the cooperative representing the purchase of goods to members on behalf of the cooperative, followed by the murābaḥah sale and purchase contract. The implementation of the murābaḥah contract is in accordance with Sharia principles, without any elements of usury, gharar, maisir and zhulm. Nevertheless, Mitra Dhuafa Cooperative needs to pay attention to the members, must understand the process of the contract mechanism used, then members so that they carry out all their obligations in fulfilling the instalments.
HPPCv: a Modification of HPPC Scheme with Vinegar Variables Ali, Saifullah; Wijayanti, Indah Emilia; Isnaini, Uha
Journal of Fundamental Mathematics and Applications (JFMA) Vol 8, No 1 (2025)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jfma.v8i1.23279

Abstract

The Hidden Product of Polynomial Composition (HPPC) Digital Signature is multivariate-based cryptography using an HFE trapdoor. The HPPC scheme provides the technique for choosing the HFE central map. Its technique utilizes the product of the composition of two linearized polynomials. In this research, we proposed the modification of the HPPC scheme. We modify the HPPC scheme such that the scheme is based on HFEv. The linearized polynomial with vinegar variables will be chosen for constructing the central map. In our modification version, the public key becomes a system of polynomials of degree 4 and a map from n+v to n-dimension vector space. For a final remark, Despite an increase in the polynomial degree, HPPCv maintains a computational cost similar to HPPC.
Co-Authors Amalia, Zalva Indah Emilia Wijayanti Uha Isnaini Yusuf, Yusriaina