New answers tagged authorization
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I don't know if it actually ticks all your requirements, but I personnaly use ssss, an implentation of shamir secret sharing
I have splitted a password and printed the resulting shares on plastic card of a size of CB, and hand it over to members of my family.
Have a look at https://security.stackexchange.com/a/5428/77603 for another alternative: libgfshare
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