Thanks for the hint. Without searching the Web just yet in between two calls, 
do you happen to know of any option for Windows users? Regards -- Alexander 
Kriegisch
-------- Ursprüngliche Nachricht --------Von: Andrew Gallagher 
<andr...@andrewg.com> Datum: 20.12.20  17:11  (GMT+07:00) An: Alexander 
Kriegisch <alexan...@kriegisch.name> Cc: gnupg-users@gnupg.org Betreff: Re: 
Split private key in order to share among users > On 20 Dec 2020, at 09:19, 
Alexander Kriegisch <alexan...@kriegisch.name> wrote:> > The original PGP used 
to have this feature around 20 years ago already,> maybe some people remember. 
In the list archive I found two threads,> both several years old, asking about 
this feature in GnuPG, but there> were no conclusive answers, only workaround 
suggestions like to split> the binary or ASCII key file or print the password 
and share parts of> the passwords, neither of which satisfy the original 
requirements> covered by the original PGP functionality. Example:> > I split a 
private key file with PGP into these shares:>  -- User A gets a piece of key 
worth 2 shares.>  -- User B gets a piece of key worth 2 shares.>  -- User C 
gets a piece of key worth 1 share.>  -- User D gets a piece of key worth 1 
share.>  -- User E gets a piece of key worth 1 share.>  -- User F gets a piece 
of key worth 1 share.> > I define that at least 5 shares are necessary to 
re-assemble a valid> decryption key, i.e. we need for example>  -- A + B + one 
other user>  -- C + D + E + either A or B> for decryption.> You’re referring to 
Shamir’s secret sharing scheme, for which several implementations exist. If you 
are using Linux, it should be as simple as installing the “ssss” package. A
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