split key

Noun

1. A key split at one end like a split pin, for the same purpose.
   • A split pin is also a split key, because both are used to lock or fasten pieces of machinery together. - 1869, Cameron Knight, The Mechanician and Constructor for Engineers:
   • In a rail-stay, the combination of a bar, with rail-clamping means associated with the bar at each end, a spilt key to hold said means in engagement with the rail flange, and a fixed projection to force the leaves of...
   • I am of the opinion, upon the evidence, that, although provision was made in the bolt for the split key, as a matter of fact no split key had ever been inserted. - 1914, Dominion Law Reports - Volume 14, page 703:
2. A key value used to identify where to split the children of a parent node in a B-tree or similar data structure.
   • As with B+-trees, records with keys greater than or equal to the split key go to a new current node, records with keys less than the split key remain in the original node. - 1990, Hector Garcia-Molina, H. V. Jagadish,...
   • The region is split into two logical daughter regions. The split is not done physically at this point to make the splitting process fast. The split is maintained as a split key, which is a key in the middle of the key...
   • Take the key in the parent node that splits the left sibling and the leaf, the split key, and insert it into the leaf. - 2016, Christopher G. Healey, Disk-Based Algorithms for Big Data, →ISBN:
3. A cryptographic key that is divided into two or more values that individually cannot be used to deduce the entire key.
   • Moreover, even those systems (such as split key systems) that can decrease these risks, do so with a marked increase in cost. - 1997, Cryptography and Privacy Sourcebook, →ISBN, page 15:
   • A toolkit for split key cryptography in and of itself is (almost) a byproduct of developing ultra-high assurance applications such as root certifying authorities. - 2007, Matt Blaze, Financial Cryptography, →ISBN, page...
   • Camenisch et al. [CCGS10] define, among other things, split key exchange and give a construction based on the decisional Diffie-Hellman assumption. - 2014, Michel Abdalla, Roberto De Prisco, Security and Cryptography...