TTPwire Vol. 1 · MITRE ATT&CK·Tagged

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Schneier on Security

Medieval Encrypted Letter Decoded

Bruce Schneier · 2026-04-27 · Read original ↗

ATT&CK techniques detected

1 predictions
T1140Deobfuscate/Decode Files or Information
98%
"medieval encrypted letter decoded sent by a spanish diplomat. apparently people have been working on it since it was rediscovered in 1860."

Summary

Sent by a Spanish diplomat. Apparently people have been working on it since it was rediscovered in 1860.