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What does it mean to sign a mobile phone with two files, a certificate file (cer) and a key?
Every mobile phone has a serial number, and each serial number can correspond to a mobile phone certificate. Just like an ID card, you can't use my ID card. As long as you provide the serial number of your mobile phone, you can make a proof on the last website of your mobile phone. Key is a document used when signing, which is useless, but signing is only for use. The key is the same. You can sign by making a certificate online. Hmm. How interesting