Public key, private key and digital signature

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How do we know that the owner of the public key is Xiao Ming? This requires a digital certificate issued by a CA.
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Source: https://www.bilibili.com/video/BV18N411X7ty?spm_id_from=333.999.0.0&vd_source=7f25e5402d68ef39fa34a1cfc9cc771a

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Origin blog.csdn.net/weixin_43732022/article/details/126664735