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Mission-critical networks show great potential in emergency response and/or recovery, health care, critical infrastructure monitoring, etc. Such mission-critical applications demand security service be "Anywhere", "Anytime" and "Anyhow". However, it is challenging to design a key management scheme in current mission-critical networks to fulfill the required attributes of secure communications, such as data integrity, authentication, confidentiality, non-repudiation and service availability. This paper presents a self-contained public key management scheme, called SMOCK, which achieves almost zero communication overhead for authentication, and offers high service availability. In the scheme, small number of cryptographic keys are stored off-line at individual nodes before they are deployed in the network.
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