验证者可根据实际情况，实施一次或两次验证，从而实现了双重安全保护机制。
The verifier can verify the signature one time or twice by the actual situation, so it can realize a kind of scheme with the dual security of protection.
验证者可根据实际情况，实施一次或两次验证，从而实现了双重安全保护机制。
The verifier can verify the signature one time or twice by the actual situation, so it can realize a kind of scheme with the dual security of protection.
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