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TCSEC

Multics was flawless?

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Last week I participated in a very geeky panel discussion about a now-defunct standard for computer system security: the TCSEC. I showed some charts and diagrams about costs, error rates, and adoption of government-sponsored programs for evaluating computer securityDuring the panel, some audience members made the following claim:

"After its evaluation, Multics never needed a security patch."

I admit I find this hard to believe, and it's not consistent with my own Multics experience. However, most of my Multics experience predated the evaluation. So I ask: does anyone know if Multics had a security patch after its B2 TCSEC evaluation?

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