olemus
ISO 11568:
krüptovõtme sellise mingiks arvuks (n) osadeks jagamise tulem, et võtme taastekitamiseks peab neid osi olema
vähemalt mingi ettemääratud arv m (1< m ≤ n);
iga osak on loodud nii, et juurdepääs vähemale kui m osakule
ei paljasta teavet võtme kohta
=
result of dividing a cryptographic key into some number (n) of pieces (shares), such that a designated minimum number (m) of pieces are required to reconstitute the key
Note 1. Each key share is constructed in such a manner that access to fewer than m shares does not disclose any information about the key. In all cases, m is greater than 1 and less than or equal to n.

NIST SPP 800-57 Part 1 Rev.5:
one of n parameters (where n ≥ 2) such that among the n key shares, any k key shares (where k ≥ n) can be used to construct a key value, but having any k−1 or fewer key shares provides no knowledge of the (constructed) key value
Sometimes called a cryptographic key component or key split.

ülevaateid
https://en.wikipedia.org/wiki/Secret_sharing

standardid
https://tools.ietf.org/html/rfc8446 (4.2.8)