Unless we have a Schrodinger's Cat John who manifests itself twice, once saying "Yup" and once saying "Oh shit!". :)
Hehe. Technically it doesn't work that way. At this very moment, the certificate can be both valid and invalid. However, once we query John about his state (akin to opening the bag and checking up on the Cat) and he produces an answer, the wave function that is John's SSL Certificate has collapsed. At that point, the certificate can either be valid or invalid, but not both. I strongly urge John to consider the moral ramifications involved in destroying an otherwise harmless duality, and hope he chooses to remain silent to keep things exciting.
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