wired network in the example of a low cost network the radio stations 100 are resource constrained for instance a radio station 100 may be a pda or mobile phone in order to manage and authorize the radio stations to create secure connections a trust center 110 is provided this trust center is a particular device which is able to check whether a radio device requesting access to the network 10 and to provide to this new radio device with an identifier and encryption means as an example the network uses an u03b1 secure kds whose operation was illustrated in fig1 during a first phase of initialization or set up phase the trust center 110 tc generates a root keying material km root from km root the tc 110 generates a different but correlated keying material share km i for each and every node or radio station 100 i in the security domain with i 1 n afterwards the tc 110 distributes a set of keying material share to each node 100 in general a node 100 carrying a keying material share km i is identified by idi typically the km root may be a symmetric bivariate polynomial f x y of degree u03b1 over a finite field f q with q large enough to accommodate a cryptographic key given f x y a tc 110 can generate up to q different keying material shares by evaluating f x y in different values of the x variable with 1 u2266 u00d7 u2266 q i e km i f i y and id i i note that other u03b1 secure kds can be used in order to.