Split Knowledge is a cryptographic concept where two or more entities separately hold key components that individually reveal no knowledge of the final cryptographic key. Which option best describes this concept?

• A. It involves duplicating a key for backup storage.
• B. It is a method by which two or more entities separately hold key components that individually reveal no knowledge of the final cryptographic key.
• C. It encrypts data using a two-key scheme.
• D. It stores the key in a single location.

Answer: (B)

Split knowledge means the cryptographic key is divided into parts and given to multiple people or systems so that each part alone reveals nothing about the final key. Only when enough parts are combined can the complete key be reconstructed, often using a secret-sharing scheme. This setup enforces multi-person control and reduces the risk that a single person or compromise could expose the entire key.

That description matches the concept best, because the other ideas describe duplicating for backup, using two keys in encryption, or storing the key in one place—none of which capture the requirement that multiple components held separately by different parties are required to reveal the full key.