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Threshold cryptography is a novel cryptographic technique sharing secret among members. It divides a secret key into multiple shares by a cryptographic operation. This technique is useful to provide a shared secret key to master nodes in a infrastructure-less Mobile Ad-hoc NETwork (MANET). As an additional component, Proactive Secret Sharing (PSS) allows a set of nodes holding shares to refresh all shares by generating a new set of shares for the same secret key from the old shares without reconstructing the secret key. It is necessary to refresh the shares to secure the secret key from threats of exposing the secret key when threshold cryptography is used.
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