# deBeam - Secure File Transfer — Send files over LAN > Send files over LAN (iPhone/iPad app by Tan Vi Minh.) - Source: https://appshunter.io/ios/app/debeam-secure-file-transfer/id6772793995 (this page in markdown: same URL + `.md`) - Developer: [Tan Vi Minh](https://appshunter.io/developer/1880561159) - Category: Utilities, Productivity - Price: Free - Age rating: 12+ - Requires: iOS 15.1 · 40 MB - Languages: English - Released: 2026-05-31 - Data updated: 2026-06-25 - User reviews in markdown: https://appshunter.io/ios/app/debeam-secure-file-transfer/id6772793995/reviews.md ## What is deBeam? deBeam transfers files directly between devices over local Wi-Fi at full network speed. --- HOW IT WORKS --- Pairing takes just 3 seconds. The receiver taps "Receive" to show a QR code. The sender scans it and taps "Send". Done. No usernames, no pairing codes, no waiting for cloud servers. --- WIRELESS TRANSPORT MODE --- Wi-Fi LAN (Same Network / Hotspot) Already on the same router or connected via a Mobile Hotspot? deBeam uses your existing local network path. Every device keeps its own IP, eliminating IP collisions. Fully cross-platform: transfer between iOS, iPadOS, macOS, and other mobile or desktop platforms with no setup required. Real-world speed: 50-100 MB/s. A 1 GB video transfers in under 20 seconds. High-performance local streaming without routing bottlenecks or cloud dependency. --- PROTOCOL-LEVEL END-TO-END ENCRYPTION --- Security in deBeam is the protocol itself, implemented at the lowest native layer. Key Exchange - X25519 ECDH Every session generates a new keypair from scratch using random bytes from the OS secure random number generator. The receiver's public key is embedded in the QR code. Scanning performs an X25519 Elliptic Curve Diffie-Hellman exchange, producing a shared secret that exists only on those two devices for that one session. The attacker space is 2^255 - computationally impossible to brute force. Key Derivation - BLAKE2b The shared secret is processed through BLAKE2b with the context string "deBeam-v3-session". This binds the derived key strictly to this protocol version, preventing key reuse or replay attacks. Encryption - ChaCha20-Poly1305 (AEAD) Every byte of your files is encrypted with ChaCha20-Poly1305. Files stream in 1 MB chunks, each with a unique nonce derived from its file index and chunk position. No nonce reuse: No two chunks ever share a nonce - cryptographic reuse attacks are impossible. Integrity: Each chunk carries a 16-byte Poly1305 authentication tag. Any tampered or replayed chunk is instantly detected and the connection terminates. Memory Security - crypto_wipe() After the key exchange, ephemeral private keys and session keys are immediately wiped from memory using crypto_wipe(). Past sessions cannot be recovered even if the device is compromised later. Threat Coverage Eavesdropping: Blocked by ChaCha20-Poly1305 encryption. Man-in-the-middle: Blocked by X25519 (cannot forge secret without private keys). Rogue device: Impossible without the QR-embedded public key. Brute force: 2^255 key space - mathematically infeasible. An 8-byte visual key fingerprint ("A1B2-C3D4...") on the receiver's screen allows quick visual verification before files move. --- NATIVE PERFORMANCE --- The encryption and streaming engine is written via native integration using Monocypher 4.0.2 - a compact, audited crypto library. ChaCha20-Poly1305 runs at ~500 MB/s on ARMv8. Encryption overhead is zero compared to Wi-Fi throughput - no speed penalty for maximum security. --- NO SERVER. NO CLOUD. NO ACCOUNT. --- deBeam has no backend infrastructure. No signup, no login, no tracking, no telemetry. QR pairing is computed entirely on-device and works 100% offline. Files travel directly from sender to receiver. --- CORE FEATURES --- Send multiple files in a single session All file types: videos, photos, docs, archives, RAW files, and custom formats Persistent local storage - chosen destination saved securely via Security-scoped Bookmarks No file size limit QR code pairing - no manual IP entry, no accounts Visual key fingerprint for authenticity verification Files saved securely to system Downloads or custom user-defined directory Real-time transfer progress per file Full cross-platform support across mobile and desktop devices deBeam. Beam it. Privacy Policy: https://devitan-docs.gitbook.io/devitans-apps/x.-privacy-policy-for-devitans-apps Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Version history (last 4 releases) ### 1.4.0 — 2026-06-16 - Added code-based sending for devices without cameras. - Added support for sharing files to deBeam from other apps. - Optimized the system for smoother, more reliable transfers. ### 1.2.0 — 2026-06-01 deBeam now feels right at home on iPad and Android tablets. A new sidebar keeps navigation always within reach, while the interface automatically adapts to your screen — no setup needed. Dialogs and pop-ups are also tidied up on larger screens, and platform info across all languages has been refreshed to reflect full macOS and Windows support. ### 1.1.0 — 2026-05-31 Added a 6-digit pairing token on the receive screen to seamlessly support sender devices without cameras (e.g., Mac mini, laptops, desktops). Optimized data streaming architecture to deliver significantly faster file transfer speeds across all devices. ### 1.0.0 — 2026-05-31 No release notes. ## More apps by Tan Vi Minh - [Filmos - Analog Camera & Video](https://appshunter.io/ios/app/filmos-analog-camera-and-video/id6759767601) - [Filmos Lab - Analog Darkroom](https://appshunter.io/ios/app/filmos-lab-analog-darkroom/id6762355781) All apps by Tan Vi Minh: https://appshunter.io/developer/1880561159 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*