Perbandingan Kinerja Skema Pengamanan Data AES‑256+X25519 dengan AES‑256+RSA‑OAEP pada Blockchain PoA

Irza Nur Fauzi; Aghus Sofwan; Maman Somantri

doi:10.30591/jpit.v11i2.10279

Perbandingan Kinerja Skema Pengamanan Data AES‑256+X25519 dengan AES‑256+RSA‑OAEP pada Blockchain PoA

Irza Nur Fauzi, Aghus Sofwan, Maman Somantri

Abstract

Keamanan data dalam sistem blockchain Proof of Authority yang menggunakan pendekatan terpusat menuntut mekanisme enkripsi dan pengelolaan kunci yang tidak hanya kuat tetapi juga efisien, sehingga penelitian ini memfokuskan pada evaluasi kinerja dua skema pembungkus kunci, yaitu X25519 dan RSA OAEP, yang dipadukan dengan AES 256 GCM sebagai algoritma enkripsi utama. Tujuan penelitian adalah membandingkan performa kedua skema dari sisi waktu enkripsi, waktu dekripsi, ukuran artefak kriptografis, serta dampaknya terhadap integritas blok dalam struktur rantai yang diperkuat blockchain Proof of Authority. Metode yang digunakan merupakan pendekatan Design and Development Research melalui perancangan dan implementasi prototipe blockchain berisi sepuluh blok yang diuji secara berurutan, termasuk skenario sabotase pada Blok 3 untuk mengamati ketahanan struktur integritas. Hasil penelitian menunjukkan bahwa RSA OAEP memiliki waktu enkripsi rata-rata lebih cepat yaitu 0.166 ms, sedangkan X25519 lebih unggul pada proses dekripsi dengan rata-rata 0.182 ms dan menghasilkan wrapped key yang lebih ringkas. Uji integritas menunjukkan bahwa modifikasi tunggal pada satu blok menyebabkan kegagalan blockchain Proof of Authority pada blok yang diserang dan ketidaksesuaian tautan hash pada blok-blok berikutnya sehingga seluruh rantai dinyatakan tidak valid. Simpulan penelitian menegaskan bahwa X25519 lebih cocok untuk lingkungan PoA yang menuntut efisiensi verifikasi, sementara RSA OAEP tetap relevan untuk sistem yang memprioritaskan kecepatan enkripsi pada sisi pengirim.

Keywords

AES‑256; Blockchoan PoA; Merkle Tree; RSA‑OAEP; X25519

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DOI: https://doi.org/10.30591/jpit.v11i2.10279