Fast. Private. Together. — Send it. It's there.
Engineered by Thisma Labs.
Beside is a local-first peer-to-peer file, folder, and text sharing application for Windows 10/11 (x64) and Android 8.0+ (arm64-v8a). Powered by a native Rust core (rustls + ring + mDNS) and a Flutter UI, all transfers stay strictly within your local Wi-Fi network without cloud intermediaries or external relay servers.
Key Features & Specifications:
- Mutual TLS 1.3 Encryption: Every connection is encrypted end-to-end with TLS 1.3 and pinned X.509 SPKI SHA-256 device certificates.
- 8-Digit SAS Pairing: Derived via RFC 8446 / RFC 5705 TLS Exporter (EXPORTER-beside-pairing-sas-v1) with a 60-second single-attempt window to prevent MITM attacks on shared Wi-Fi.
- Hardware Key Protection: Private keys encrypted at rest via Windows DPAPI and Android Keystore AES-256-GCM.
- Bounded 64 KB RAM Streaming: Streams multi-GB files in 64 KB chunks with per-file SHA-256 integrity verification, atomic .part finaliza