A Retrospective on the Use of Export Cryptography

By David Adrian

In this talk, I’ll examine the technical details and historical background for all three export-related vulnerabilities, and provide recent vulnerability measurement data gathered from over a year Internet-wide scans, finding that 2% of browser-trusted IPv4 servers remain vulnerable to FREAK, 1% to Logjam, and 16% to Drown. I’ll examine why these vulnerabilities happened, how the inclusion of weakened cryptography in a protocol impacts security, and how to better design and implement cryptographic protocols in the future. Having been involved in the discovery of all three export vulnerabilities, I’ll distill some lessons learned from measuring and analyzing export cryptography into recommendations for technologists and policymakers alike, and provide a historical context for the current “going dark” and Apple vs. FBI debate.

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