ScreenshotBuilt during my research internship at Qualcomm Institute, this is a peer-to-peer video communication system where encryption keys are established through a simulated BB84 quantum key distribution protocol. The system implements the full QKD pipeline — sifting, error estimation, Cascade error correction, and Toeplitz privacy amplification — then uses the resulting keys for AES-128-GCM encryption of WebRTC media streams via Insertable Streams. Includes automatic eavesdropper detection that rejects and re-exchanges keys when the quantum bit error rate exceeds 11% — an intercept-resend attack can be switched on mid-call to watch the error rate spike and the key be discarded. Backed by 94 tests across the Python signaling server and JavaScript client.
