Keamanan data sangat penting dilakukan dalam menjaga kerahasiaan informasi itu sendiri, terutama bila informasi tersebut hanya boleh diketahui pihak yang tertentu saja. Pengiriman data atau informasi tanpa dilakukan pengamanan akan beresiko terhadap penyadapan. Sehingga informasi yang ada di dalamnya dapat mudah diketahui oleh pihak-pihak yang tidak berhak, dan hal seperti itu sangat merugikan.Hingga saat ini, kriptografi merupakan salah satu solusi untuk menjamin keamanan dari suatu informasi. Zero Knowledge Proof (ZKP) merupakan protokol kriptografi yang dapat digunakan seseorang untuk membuktikan kepemilikan seseorang (prover) akan suatu informasi rahasia kepada orang lain (verifier), tanpa perlu mengungkapkan informasi tersebut atau memberikan cara bagi orang lain untuk mengetahui rahasia tersebut. Hasil pengujian adalah Zero Knowledge Proof membagi satu aliran data menjadi blok-blok kecil Masing-masing blok ini dienkripsi secara terpisah. Dalam implementasi tanpa bukti pengetahuan, kunci untuk mengenkripsi hanya akan berada pada pengguna, dan dengan itu, ia akan dapat mengenkripsi dan mendekripsi informas, Algoritma zero knowledge proof adalah metode yang unik dimana pengguna dapat membuktikan kepada pengguna lain bahwa dia tahu informasi tambahan.
 Kata Kunci: Keamanan ,data,penyadapan ,Zero-Knowledge proof
Ijazah konvensional mempunyai beberapa kekurangan diantaranya yaitu bisa dipalsukan, membutuhkan tempat pemyimpanan yang aman dan bisa rusak. Oleh karena perlu dibuat teknologi informasi yang bisa mengatasi kekurangan tersebut, salah satunya adalah smart contract pada blockchain Ethereum. Smart contract pada blockchain Ethereum memungkinkan membuat ijazah dengan integritas dan keamanan data yang tinggi, sehingga bisa meminimalisir kerusakan dan pemalsuan ijazah. Akan tetapi blockchain Ethereum memerlukan biaya yang besar dalam menyimpan data yang besar. Pada penelitian ini bertujuan guna mengukur performa dari pengimplementasian IPFS pada smart contract yang dapat membuat biaya transaksi lebih stabil dan murah sebesar 61,95% dibandingkan dengan blockchain Ethereum tanpa mengimplementasikan IPFS. Selain itu, performa pada smart contract yang mengimplementasikan IPFS dapat meningkatkan performa dari Quality of Service (QoS) dengan parameter throughput sebesar 6,04 kali, Packet Loss 39,47%, dan Latency 42,28%.
Penerapan Teknologi Blockchain guna memberikan keamanan terhadap keamanan sertifikat di era digital 4.0 agar tidak terjadinya manipulasi oleh pihak yang tidak bertanggung jawab. Dengan menggunakan metode perumusan masalah, perancangan penelitian, pengumpulan data, pengolahan & penyajian data, analisa & laporan penelitian dan metode penelitian 7 (tujuh) literature review. Hal ini diharapkan agar dapat menyelesaikan permasalahan keamanan sertifikat itu sendiri. Saat ini keamanan dalam sertifikat masih sangat minim, oleh karena itu dibutuhkan adanya teknologi blockchain untuk mengamankan sertifikat dari proses manipulasi oleh pihak yang tidak bertanggung jawab. Secara khusus, terdapat 2 (dua) manfaat dari penelitian ini yang menggunakan teknologi blockchain, (1) Sertifikat menjadi lebih aman dengan adanya kode enkripsi, (2) Sertifikat menjadi lebih transparan dengan adanya blockchain. Penelitian ini mengimplementasikan kode enkripsi ke dalam sistem keamanan sertifikat menggunakan teknologi blockchain dimana saat ini banyaknya kasus manipulasi data di dalam sertifikat.

 LoA or Letter of Acceptance is a statement received. LoA is usually used as a statement of scholarship acceptance or even journal acceptance. In addition, the current issuance of LoA is still conventional, using paper as the access medium. This is certainly inefficient. In addition, the issuance of LoAs that can be accessed through the website also has certain problems. Many parties doubt the security of the LoA issued through the website, whether confidentiality is really maintained or not. To solve this problem, e-LoA (electronic LoA) was implemented using blockchain technology on the Technopreneurship Journal website. With the use of blockchain technology on this website, LoA data cannot be changed, duplicated or deleted. So that it can improve security and support transparency in the issuance and access of LoA. e-LoA issued through the website also makes it easier for parties to access and download a verified LoA.
Cijujung 04 State Elementary School is one of the basic educational institutions that is always developing with the number of students increasing from time to time. Cijujung 04 Public Elementary School is a state school, this school is located in the Cikupa-Nagrak village of Cijujung village, cibungbulang sub-district, Bogor Regency. Public elementary schools or other private elementary schools also have very important data. One of them is a master book. The student handbook is a data set of students studying at the school. Student Parent Book is one of the most important parts of the management of this institution. The notes in the master book must be complete. Includes, student biodata, student grades, and student achievement results from the first semester to graduate school. However, in its implementation so far it has been ineffective and inefficient because it is carried out manually, namely by writing data in a thick ledger or a master book. The teacher also had difficulty finding student data in the parent book and also sought students for prospective recipients of PIP assistance. A system is needed that can be used by teachers to find student data in the parent book and also look for students for potential recipients of PIP assistance. Nested queries or queries are queries that have other queries in them. By using the nested query method in the parent book system, the search process for prospective PIP recipient students can be searched as needed because in the parent book system has a student search feature based on the desired category. Based on the nested query method. From the results of the distribution of questionnaires to test the system distributed to informatics engineering system respondents obtained a percentage of system eligibility of 87% so that it can be categorized as very feasible, while the results of distributing questionnaires to user respondents obtained a percentage of system feasibility of 94.5% so that it can be categorized as very feasible
Cryptography is known for it's ability to protect confidential information, but it can also be used for other purposes. One of them is for identity verification or authentication. One of the biggest disadvantages of traditional authencation method is at the end of the session, the verifier knows about secrets which is supposed to be known only by prover. In this paper, we implemented a ZeroKnowledge Proof-based secret ticket verification system using Feige Fiat Shamir protocol. The goal of this system is to help prover identified themselves to the verifier, but also prevent the verifier to understand anything about the prover's secret information. The system is also able to prevent ticket duplication or double-use of tickets by using an interactive proof verification method. By combining it with cryptography, not only we can achieve completeness and soundness property of Zero-Knowledge Proof, but we can also achieve information security property. Index Terms - Feige Flat Shamir, Verification, Zero Knowledge Proof.