AuthLoop: End-to-End Cryptographic Authentication for Telephony...
summary
End-to-end cryptographic authentication runs entirely over the voice channel using a custom in-band modem that encodes data as frequency shifts, yielding about 500 bits per second (practical ~400 bps) with average bit errors 0–0.5%. A small link layer sends 32-bit blocks with 29 data bits and a 3-bit CRC and retransmits until success. A slim TLS‑style handshake completes in ~9 seconds (cached certs ≈5 seconds vs 97s for naïve TLS). A carrier-based PKI stores certificates compactly; implemented across landline, cellular and VoIP and shown feasible.
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chapters (13)
- 0:00Introduction
- 0:23The Problem
- 4:12TLS
- 5:18AuthLoop
- 6:39Two Big Problems
- 12:23TLDS
- 13:01Requirements
- 15:55Protocol
- 17:44Performance
- 18:22Certificate Infrastructure
- 20:16Summary
- 21:09Number Portability
- 24:28Questions
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