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These 5-button locks typically use a 4-digit passcode, so the number of possible combinations is 5^4, or 625 unique combinations. A 10-button lock is 10^4, or 10000 unique combinations. However, there is no guarantee that the 10-button lock does not employ parallel switches. On such a lock, if the 1-2, 3-4, 5-6, 7-8, and 9-0 buttons are wired in parallel ...


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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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I watched the linked Defcon talks (2012 and 2015) and just wanted to summarize my key takeaways, which surprisingly no other answer has done before: The talks focused on data centers, which means spinning platters (because those are still cheaper as of 2021 when you need hundreds of TB), even though solid state disks might be easier to destroy. The talks ...


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