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Secure Unix ancestor KSOS did type safety before Rust made it cool

ID: 18013cf8-d86a-53fe-9cb9-40941765481d

STIX ID: report--18013cf8-d86a-53fe-9cb9-40941765481d

Feed Name: The Register (Security)

Date Published: 2026-07-06

Date Updated: 2026-07-23

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KSOS, a Department of Defense–backed, Modula-implemented secure UNIX-compatible operating system from the late 1970s and 1980s, has had its source code recovered and added to The Unix Heritage Society archives; the article summarizes KSOS's history, formal verification goals, production uses, and the effort to locate its original compiler and related artifacts.

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