[Cryptography] Secret sharing for family members

Dennis E. Hamilton dennis.hamilton at acm.org
Sun Oct 18 19:58:51 EDT 2020

From: Francis Pouatcha via cryptography
Sent: Saturday, October 17, 2020 04:42

SSDs have a finite lifetime. but lets do this systematically:
Confidentiality - can anyone read the data before they should?
Integrity - can the data be modified without detection?
Availability - could we lose the data?
I wouldn't rely on any kind of solid enough cryptographic algorithm or durable enough storage. Time is the enemy of all these properties. Adequate solution needs a procedure with a lot of rotation of everything, starting with the secret itself, crypto keys, storage, data, trusted  people, transparency logs.
Elaborate treatment of Shamir secrets deleted.
So what happened to the distribution of separate pieces of a Benjamin (or some pieces of a dissected puzzle) that it takes a minimum of m of n people to show their parts and confirm that they fit together?  Someone trusted has to hold the treasure, unless there is a very fancy lock 😊.  Aren’t we over-thinking this problem?
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