Wireless sensor network (WSN) has become one of the most promising network technologies for many useful applications.\nHowever, for the lack of resources, it is different but important to ensure the security of the WSNs. Key management is a corner\nstone on which to build secure WSNs for it has a fundamental role in confidentiality, authentication, and so on. Combinatorial\ndesign theory has been used to generate good-designed key rings for each sensor node inWSNs. A large number of combinatorial\ndesign based key management schemes have been proposed but none of them have taken key updating into consideration. In this\npaper, we point out the essence of key updating for the unital design based keymanagement scheme and propose two key updating\nmethods; then, we conduct performance analysis on the two methods from three aspects; at last, we generalize the two methods to\nother combinatorial design based key management schemes and enhance the second method.
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