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a high-assurance, high-performance microkernel

a high-assurance, high-performance microkernel developed, maintained and formally verified by NICTA and owned by General Dynamics C4 Systems. It is a member of the L4 family of microkernels, and is the world's most advanced, highest-assured operating-system microkernel.

seL4's implementation is formally (mathematically) proved correct (bug-free) against its specification, is proved to enforce strong security properties, and its operations have proved save upper bounds on their worst-case execution times.



Verified by

Verified on




Leaders and contributors

Adrian Danis
Stephen Sherratt
Gerwin Klein
Thomas Sewell
akroh <>
Matthew Fernandez
Wink Saville
Joel Beeren
Anna Lyons

Resources and communication

Software prerequisites


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