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Mar 28, 2014 SSH private / public key pair & self sign certificate. One of the most common forms of cryptography today is public-key cryptography helps to communicate two system by encrypting information using the public key and information can be decrypted using private key. Jul 01, 2019 The public key, which you share, can be used to verify that the encrypted file actually comes from you and was created using your key. It can also be used by others to encrypt files for you to decrypt. To generate your key pair, open your terminal, and type the. Jul 09, 2019 Normally, the CSR/RSA Private Key pairs on Linux-based operating systems are generated using the OpenSSL cryptographic engine, and saved as files with “.key” or “.pem” extensions on the server. But no specific extensions are mandatory for text files in Linux, so the key file may have any name and extension, or no extension at all.
SSL Certificates fall into two broad categories: 1) Self-Signed Certificate which is an identity certificate that is signed by the same entity whose identity it certifies-on signed with its own private key, and 2) Certificates that are signed by a CA (Certificate Authority) such as Let’s Encrypt, Comodo and many other companies.
The software speeds up downloading time like no other, and it ensures security while doing so. 
With this program, you can avoid the hassles of slow downloads and save a lot of time.
May 28, 2015 This blog describes how to generate a private/public key pair using GPG version 1.4.5. The resulting public key will contain two keys, one key for signing and a subkey for encryption. This key can be used with HCM Fusion SaaS to encrypt/decrypt files as they are transferred to. To do so follow these steps: Open up the Terminal. Type in the following command. I'm adding HTTPS support to an embedded Linux device. I have tried to generate a self-signed certificate with these steps: openssl req -new cert.csr openssl rsa -in privkey.pem -out key.pem openssl x509 -in cert.csr -out cert.pem -req -signkey key.pem -days 1001 cat key.pemcert.pem.
Self-Signed Certificates are commonly used in test environments for LAN services or applications. They can be generated for free using OpenSSL or any related tool. On the other hand, for sensitive, public-facing production services, applications or websites, it is highly recommended to use a certificate issued and verified by a trusted CA.
The first step towards acquiring an SSL certificate issued and verified by a CA is generating a CSR (short for Certificate Signing Request).
In this article, we will demonstrate how to create a CSR (Certificate Signing Request) on a Linux system.
Creating a CSR – Certificate Signing Request in Linux
To create a CSR, you need the OpenSSL command line utility installed on your system, otherwise, run the following command to install it.
Then issue the following command to generate a CSR and the key that will protect your certificate.
where:
- req enables the part of OpenSSL that handles certificate requests signing.
- -newkey rsa:2048 creates a 2048-bit RSA key.
- -nodes means “don’t encrypt the key”.
- -keyout example.com.key specifies the filename to write on the created private key.
- -out example.com.csr specifies the filename to write the CSR to.
Answer correctly, the questions you will be asked. Note that your answers should match information in legal documents regarding the registration of your company. This information is critically checked by the CA before issuing your certificate.
After creating your CSR, view the contents of the file using a cat utility, select it and copy it.
Copy CSR Key
Then go back to your CA’s website, log in, go to the page will contain the SSL certificate you purchased, and activate it. Then in a window such as the one below, paste your CSR in the correct input field.
In this example, we created a CSR for a multiple domain certificate purchased from Namecheap.
Then follow the rest of the instructions to initiate activation of your SSL certificate. For more information about OpenSSL command, see its man page:
That’s all for now! Always remember that the first step to getting your own SSL certificate from a CA is to generate a CSR. Use the feedback form below to ask any questions or share your comments with us.
CSR stands for ‘Certificate Signing Request’, that is generated on the server where the certificate will be used on. A CSR contains information about to your organization and domain name, locality, and country and a public key that will be included in your certificate.
This article has 3 methods to create CSR (Certificate Signing Request) on Linux systems. You can choose any one of below methods. All methods will do the same task, only they have a detailed explanation.
Method 1 – Using Single Command
We can create CSR using the single command like below. But make sure you have installed OpenSSL package on your system. The below command will first create a private key and then generate CSR. This command will also require few details as input.
Method 2 – Short Instructions
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Below are three simple commands to generate CSR. You may also use detailed instructions to do it.
Method 3 – Detailed Instructions
Step 1: Install Required Packages.
In order to generate CSR, you required OpenSSL to be installed on your system. If it is not already installed use below command to install it.
Step 2: Generate Key for your Domain.
Firstly you required root access to generate a key file. So login as root and use below command to generate a key.
Sample output:
At the end of the command, it showing 2048, which is the length of the key in bits. Most of CA required 2048 bit length keys. Above command will create a key file tecadmin.net.key, which is used in step 3.
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Step 3: Generate CSR for your Domain using Key.
After generating a key, next steps are to generate CSR for the domain. Use below command to generate CSR file, This command will prompt for your organization and common name, locality, email, and country. Common Name must be the same as your domain name.
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Sample Output:
Above command will generate a file
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References:
Add Certificates Linux
http://wiki.centos.org/HowTos/Https
http://www.centos.org/docs/4/4.5/System_Administration_Guide/Apache_HTTP_Secure_Server_Configuration-Generating_a_Key.html