How Cloudflare CTO John Graham-Cumming cracked an encrypted ZIP file containing the code for a system that helped ANC members communicate safely under apartheid
John Graham-Cumming, who happens to be Cloudflare's CTO, cracked a 30-year-old encrypted file that had a role in rewriting South Africa's history.
Context & Ripple Effects
This recovery sits within a broader record of encryption as both a tool for private communication and a source of institutional risk. Related coverage of Open Whisper Systems' encryption work showed why systems that resist outside access can alarm governments, while the Crypto AG compromise illustrated the danger when the underlying technology cannot be trusted.
For Cloudflare, the episode adds a historical, technical dimension to a company previously linked in this corpus to challenges over government demands for information, including its challenge to National Security Letters.
First-order effects
- The previously inaccessible ZIP archive and its code can now be examined, preserved, and evaluated by people studying how ANC members communicated under apartheid.
- Graham-Cumming's work makes the system's implementation—not only accounts of its role—available for historical and technical scrutiny.
Second-order effects
- Researchers can compare the recovered implementation with later secure-communications designs, separating the system's actual protections from retrospective claims about its security.
- The case gives archivists a concrete example of how encrypted digital records can remain historically important but inaccessible until specialist recovery work succeeds.
Third-order effects
- If more politically significant archives are recovered this way, digital preservation will increasingly require cryptographic and software expertise alongside conventional archival practice.
- The episode reinforces a durable tension: encryption protects people in the moment, but long-term historical access depends on whether future custodians can lawfully and technically recover protected records.
The trend: Encrypted archives are becoming a distinct preservation challenge, linking cybersecurity expertise to the recovery of modern political history.