[Cryptography] Secret sharing for family members

Danny Mitchell fishcustard at gmail.com
Fri Oct 16 10:07:00 EDT 2020

On 11/10/2020, Henry Baker <hbaker1 at pipeline.com> wrote:
> In these days of 'digital estates', where each of us
> controls a large swath of digital accounts, there
> appears to be a need for safely sharing secrets with
> family members -- e.g., for medical and/or estate
> planning purposes.
> Here are some desiderata:
> * don't want to trust a single family member
> * family members probably not security conscious,
>   so may inadvertently disclose other family
>   member secrets
> * may need some sort of 'majority' capability
> * ability to 're-key' -- i.e., 'refresh' secrets
> * ...
> Are there any products/services that *safely*
> handle these situations?
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I'm a little surprised no-one's suggested crypto++
(https://cryptopp.com), an open-source C++ crypto class library, which
includes SSS and Rabin's Information Dispersal algorithm. There's a
command-line interface for testing, with working SSS and IDA.

(I have nothing to do with this library, only hoping the information
is useful to someone.)

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