Threshold Secret Sharing

Document Type Expired Internet-Draft (individual)
Authors David McGrew  , Praveen Patnala  , Alfred Hoenes 
Last updated 2010-03-03 (latest revision 2009-03-09)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Threshold Secret Sharing (TSS) provides a way to generate N shares from a value, so that any M of those shares can be used to reconstruct the original value, but any M-1 shares provide no information about that value. This method can provide shared access control on key material and other secrets that must be strongly protected. This note defines a threshold secret sharing method based on polynomial interpolation in GF(256) and a format for the storage and transmission of shares. It also provides usage guidance, describes how to test an implementation, and supplies test cases.


David McGrew (
Praveen Patnala (
Alfred Hoenes (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)