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How to fake X509 format certificate?

I used the openssl command-line tool to create a certificate signed by CA. now I need to intervene to create a signature mismatch error.

Is there any tool to interfere with the X509 certificate.

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Open the certificate file in ASN.1 Editor , find the commonName node, right-click it and select "Change ...".

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Change the text of the commonName field:

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Click OK, save the changes, and you:

enter image description here

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Source: https://habr.com/ru/post/1535547/

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