Patent ID: 7999685

Claim:
A wireless system for monitoring a patient, the wireless network comprising: a body sensor network that includes one or more wireless sensors operatively connected to the patient that collect and transfer information related to the patient's health to the wireless network; a set-up server that configures the one or more wireless sensors with keying materials before the one or more sensors are deployed to the wireless network, the set-up server randomly generating set ℑ of t×(n 2 +n+1) λ-degree bivariate polynomials { j i (x,y)} j=1 . . . n 2 +n+1 i=1 . . . i over Fq′ and for j=1 . . . n 2 +n+1, the set-up server sequentially picking t of the polynomials from ℑ, and forming n 2 +n+1 t-polynomials-sets F j (x,y), where λ is a number of nodes in the wireless network and is an integer greater than one, n is a prime power, t is an integer greater than or equal to one, and Fq′ is a finite field where q′ is a prime number large enough to accommodate a cryptographic key; a base station that distributes a key certificate to the one or more sensors associated with the body sensor network, such that two sensors generate a unique pairwise key based at least in part upon the pre-distributed keying material and the key certificate distributed by the base station.