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The RSA signature algorithm is an asymmetric algorithm.

The RSA key includes two parts: a public key and a private key. The public key is public information used for verification, and the private key is confidential information used for signature .

The developer's private key is kept by the developer himself; the developer's public key can be made public. The developer saves his private key and signs the information sent to Alipay. Alipay uses the developer's public key for verification, in this way to ensure the integrity of the information transmission and the identity of the sender Authenticity.

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Digital signature