You should also understand that certification authorities cannot in all circumstances check the validity of a digital certificate on which a digital signature is based.
也应该理解证书颁发机构不能在所有情况下都验证数字签名所基于的数字证书的有效性。
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The Certificate Authority(CA) as the trustee third party is introduced, and an efficient fair electronic cash system is established based on the elliptic curve blind digital signature.