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Parallel key-insulated encryption (PKIE) usually allows two independent helper keys to be alternately used in temporary secret key update operations. At least half of temporary secret keys would be exposed and at least half of ciphertexts could be decrypted if one of the helper keys is exposed. In this paper, we propose a new PKIE scheme with m helper keys, where m∈Z,m>2. If one of the helper keys...
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