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The wide-area primary and backup protection system needs available communication networks to trip relays via remote control, which is vulnerable to cybersecurity threats. This letter proposes a key graph-based key-management framework to secure the communications of wide-area primary and backup protection. Besides, the rekeying strategies are designed to deal with the redirection of communication associations due to the variation of protection zones.
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Liu et al. (2010) studied this question.
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