The next option is -days 365, which specifies the number of days that the certificate is valid for. As we’re using this together with -x509 option, it will output a certificate instead of a certificate request. The -newkey rsa:4096 option basically tells openssl to create both a new RSA private key (4096-bit) and its certificate request at the same time. In case you don’t know, X509 is just a standard format of the public key certificate. The -x509 option is used to tell openssl to output a self-signed certificate instead of a certificate request. You can run this command to see which version it’s running:Įnter fullscreen mode Exit fullscreen mode If you’re on a Mac, it’s probably already there. In order to do all of these things, we need to have openssl installed. Then finally we will use the CA’s private key to sign the web server’s CSR and get back the signed certificate.In the second step, we will generate a private key and its paired CSR for the web server that we want to use TLS.In the first step, we will generate a private key and its self-signed certificate for the CA.Instead, we will play both roles: the certificate authority and the certificate applicant. Today we will learn exactly how to generate a certificate and have it signed by a Certificate Authority (CA).įor the purpose of this tutorial, we won’t submit our Certificate Signing Request (CSR) to a real CA. In the previous article, we’ve talked about how digital certificates help with authentication and provide a safe and reliable key exchange process in TLS.
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