1) Create file hello.c
In vi text editor press key i. Text editor will enter in edit mode and you can type text.
int main(int argc, char *argv)
After editing the text press Esc. Text editor will enter in command mode. For save text to file type :w and press Enter. For quit from text editor type :q and press Enter.
Next read the "C tutorial" article.
Please note that the CA root certificate has been updated.
The certificate supports RSA 4096 bit encryption to improve security. Please follow the instructions to install the new certificate.
The SSL certificate confirms the authenticity of the site and provides secure communication with the site. All data transmitted over the network is encrypted with the certificate. Therefore, you can be sure that your data will not be read during transmission over the network. You also know that you are viewing the pages of this site, and not the fake site.
For the purpose of testing the certificate is more convenient to use the Firefox browser. When you click on the certificate link 9o1d.crt, the browser will open the dialog window
Check the box to the menu item "Trust this CA to identify websites", as shown in the picture.
When you click on the "View" button, you can view the certificate.
It shows: certificate name "sms_ca", serial number and checksum. They must match this picture.
If everything matches, close these dialogs with confirmation of the changes.
To check, type the address https://9o1d.com in browser.
The site should open and a green padlock will appear in the browser bar. When you click on the padlock, information about encryption of the connection will be displayed.
You can also read more information about the certificate used for the connection.
If you want to remove the certificate, you need to open the browser settings and enter the installed certificates menu. There are many paid certificates. Find the certificate "sms_ca" and click the "Delete" button. Of course, after that you will not be able to establish a secure connection to the site, but if you need to, you can reinstall the certificate.
Firefox browser uses its own certificate storage. Other browsers can use their own certificate storage or system shared certificate storage. How to install the certificate in the system shared certificate storage, you can read in "How to install SSL certificate in the system shared certificate storage" article.
How to test the certificate with Linux tools, You can read in the "Test SSL certificate in Linux command console" article.
Screenshots are used with permission from Microsoft.
Askar Azhibaev. Software Engineer.
How to install certificate:
Download SSL certificate: 9o1d.crt
OR get the same from OneDrive: 1drv.ms/9o1d.crt
+ you can register a free account on OneDrive:
OR copy SSL certificate text:
(select all text, , paste to any text editor, save as "9o1d.crt" and test)
Please visit the sites: