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...tually is. Instead of staying with the concept "certificate" consisting of a public part and a key, signed by some authority or oneself (yes, that is how the word certificate is normally used), I mistook the signed public key for something alike to a token, which would _replace instead of extend_ the public/private key pair. That I managed to confuse these two concepts is entirely my own fault, having worked with token-based systems, I fear I fell into the "have a hammer, everything is a nail" trap. Once I fell into it, however, I felt encouraged by the behaviour of `ssh` and p...