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split knowledge

Definitions:

  A process by which a cryptographic key is split into n key shares, each of which provides no knowledge of the key. The shares can be subsequently combined to create or recreate a cryptographic key or to perform independent cryptographic operations on the data to be protected using each key share. If knowledge of k (where k is less than or equal to n) shares is required to construct the key, then knowledge of any k – 1 key shares provides no information about the key other than, possibly, its length.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under Split knowledge