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Relationship among Digital Certificate, Public Key, Private Key and Digital Signature
The public key and the private key are a pair. The public key is used for others to decrypt, and the private key is used for self-encryption.

A digital certificate is generated with your public key, including your public key and other personal and organizational information.

A digital signature is a set of data encrypted with your private key, and others can decrypt it with your public key. Data indicating that it is approved by your signature.