Arsitektur E2EE Multi-Lapisan
Arc Protocol: Signal Protocol (libsignal) sebagai fondasi, dengan kriptografi post-quantum PQXDH (ML-KEM-1024), tanda tangan XEdDSA, dan Sealed Sender sisi klien.
Pertukaran Kunci PQXDH
Pertukaran kunci post-quantum hybrid yang menggabungkan X25519 (Curve25519) dan ML-KEM-1024 (NIST FIPS 203). Tahan terhadap serangan klasik dan kuantum.
Double Ratchet
Forward secrecy per pesan menggunakan DH ratchet + symmetric ratchet. Kompromi satu kunci tidak dapat mendekripsi pesan masa lalu atau masa depan.
Enkripsi AES-256-GCM
Enkripsi terotentikasi dengan kunci 256-bit. Setiap pesan dienkripsi dengan kunci unik yang diturunkan dari Double Ratchet.
Tanda tangan XEdDSA (libsignal)
Tanda tangan XEdDSA via libsignal. Identity Key (X25519) sekaligus berfungsi sebagai kunci penandatanganan. Termasuk verifikasi integritas daftar perangkat.
Sealed Sender Sisi Klien
Kunci ephemeral X25519 per pesan + kunci AES turunan HKDF-SHA256. Bahkan server tidak dapat melihat siapa yang mengirim pesan.
Rosetta AI has an explicit privacy boundary
Rosetta automatic translation and every TranslateGemma first pass stay on-device. After per-message consent, Premium, free access, and trials use Gemini 3.5 Flash-Lite; Intelligence uses Gemini 3.6 Flash. Only the current outgoing draft and first-pass review are sent; received messages, chat history, and encryption keys are excluded. On-device only is always available.
Read the privacy details →Comparison with 17 Major Messengers
Independent review comparing Arc V2 against 16 competitors (Signal, iMessage, WhatsApp, Telegram, LINE, Threema, Wire, Element, Session, Viber, XChat, KakaoTalk, Slack, Discord, Chatwork, Google Messages) using an 8-axis 100-point rubric.
Parameter ML-KEM-1024
Mekanisme Enkapsulasi Kunci post-quantum yang distandarisasi NIST FIPS 203.
| Algoritma | ML-KEM-1024 (via libsignal-client) |
| Level Keamanan NIST | Level 3 (AES-192 equivalent) |
| Keamanan Klasik | 2^128 bit (X25519) |
| Keamanan Kuantum | NIST Level 3 |
| Fondasi | Module Lattice (FIPS 203) |
| Ukuran Kunci Publik | 1,184 bytes |
| Ukuran Kunci Rahasia | 2,400 bytes |
| Ukuran Ciphertext | 1,088 bytes |
Kepatuhan & Standar
🇺🇸NIST CSF 2.0
Framework NIST. 6 fungsi untuk manajemen risiko siber yang sistematis.
🇺🇸NIST SP 800-53
Kontrol keamanan federal. Dasar FedRAMP.
🇺🇸FIPS 140-3
Validasi modul kriptografi federal. Mencakup ML-KEM-1024.
🇺🇸NIST SP 800-175B
Panduan pemilihan algoritma kriptografi. Berdasarkan FIPS 203.
🌐ISO/IEC 27001
Sertifikasi ISMS internasional. Dasar kepercayaan B2B/B2G.
🇪🇺GDPR
Regulasi Perlindungan Data Umum UE. Standar perlindungan tertinggi di dunia.
🇬🇧UK Cyber Essentials+
Sertifikasi keamanan siber bersertifikat pemerintah Inggris.
🇬🇧NCSC Cloud Security
14 Prinsip NCSC Inggris. Standar penilaian keamanan cloud.
Dikembangkan sesuai dengan semua prasyarat NIST AS, GDPR UE, NCSC Inggris, dan ISO internasional.
System Architecture Documentation
Complete technical specification of Arc V2 — covering the 5-layer architecture, E2EE pipeline, PQXDH implementation, key lifecycle, group encryption, multi-device architecture, BLE Mesh networking, and on-device AI.
15+ Technical Sections
Layer architecture, PQC implementation, encryption pipeline, data storage, and more
Bilingual (EN/JP)
Full documentation available in English and Japanese with one-click toggle
Version 3.1 — March 2026
Includes Elixir PreKey Server, Sealed Sender, Sender Keys, and PQXDH ML-KEM-1024
This document is classified as confidential and available exclusively to NDA-bound partners, investors, and authorized technical reviewers. Access requires prior approval by Atlas Associates.