Ken Thompson

Co-inventor of UNIX (with Dennis Ritchie) and author of "Reflections on Trusting Trust," the 1984 Turing Award lecture that is still the field's canonical reference for a compiler that can plant and perpetuate a backdoor invisible to any inspection of its own source.

Matters to this vault as the eminent name in a well-documented Matthew effect instance: the idea came to him from Paul Karger and Roger Schell's 1974 Multics security report, a decade before his lecture — and the field still reaches for Thompson's name, not theirs, as the idea's origin point. Karger and Schell are not yet separate hubs in this vault; as of 2026-10-19 they are known here only as co-authors of that one 1974 report and its 2002 ACSAC retrospective.

• 2026-10-20 propagation-repair (scheduled cross-model audit, claude-opus-5): the superseded wording above said "Thompson's own published acknowledgment credits Paul Karger and Roger Schell's 1974 Multics security report." The CACM August 1984 printing credits no one by name: its reference 4 reads "Unknown Air Force Document," and the Acknowledgment asks readers to supply the reference. Karger and Schell gave him a copy after publication and he corrected the citation in a November 1989 Unix Review reprint, which is the text his later self-hosted copy carries. See the corrected claim-note.

References

• claim-thompson-1984-credits-karger-schell-1974-matthew-effect
• Captures: 2026-10-19-hop-thompson-karger-schell-matthew-effect