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How To Create A Self-Signed SSL Certificate On Linux is a guide to creating self-signed SSL certificates using OpenSSL on Linux. It provides easy “cut and paste” code that you will need to generate your first RSA key pair. After creating your first set of keys, you should have the confidence to create certificates for a variety of situations. If you are trying to create a certificate for Web (https) you can take advantage of the free signed certificates that Cloudflare provides. Self-signing a. certificate for web use, paticularly e-commerce, is a bad idea.