Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme

Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme

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Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme SCRs was presented, in which a malicious broadcast receiver might easily recover old t shares, new share and further reconstruct the secret S.The claimed security could not be realized.In addition, a new protocol was proposed, which elaborately eliminates the defect of previous protocol and improved seat sleeve the efficiency of existing schemes.