KeibiDrop: Post-Quantum Encrypted Peer-to-Peer File Transfer Without the Cloud

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We present KeibiDrop, an open-source (MPL 2.0) peer-to-peer file transfer tool that provides end-to-end encryption using a hybrid post-quantum key exchange (ML-KEM-1024 + X25519) with ChaCha20-Poly1305 at the transport layer. KeibiDrop operates over direct IPv6 connections with no cloud intermediary, no STUN/TURN servers, and no persistent metadata. The relay server is treated as an untrusted blind intermediary: it sees only opaque lookup keys and encrypted blobs, and cannot correlate users or decrypt content. We discuss the cryptographic design, the privacy model, the trade-offs of an IPv6-only architecture, and the practical challenges of mounting remote files as a local FUSE filesystem with forward secrecy via automatic re-keying. A live demonstration accompanies the talk.

Creation date: July 2, 2026

Speakers: Marius-Florin Cristian