Skip to main content

RootCA, IntermediateCA basics

 Certificates are issued by maintaining chain of trust. Your certificate can be signed by either root ca or intermediate ca. Both of them use their private key to sign your certificate. When intermediate ca signs your certificate then it is doing that on behalf of root ca in order to off-load root ca's tasks. 

As intermediate ca signs your web server certificate, like the same way root ca signs intermediate ca's certificate so that web browser can verify that by using root ca's public key. 

Once the web server certificate is signed then a certificate bundle is created in which root ca's certificate, intermediate ca's certificate and web server's certificate are send to the organization owner who owns the web server. 

Note: OS, browsers already contains the root ca or intermediate ca's public key or certificate.

Sometimes the certificate bundle is send by the web server so that browser easily verify intermediate ca and root ca. 

Web browser checks web server's certificate by extracting the public key of intermediate ca from the certificate. As web server certificate is signed by intermediate ca so web server's certificate contains intermediate ca's public key. Once it is assured that web server certificate is valid then it is go for checking intermediate ca's certificate is ok or not by extracting the public key of root ca. As root ca signed intermediate ca's certificate, so it shall also found ok. Here used asymmetric algorithm.  

After that secure communication starts by generating secret, master secret and finally session keys. Here used symmetric algorithm for faster communication. 


Avi

Comments

Post a Comment

Popular posts from this blog

Installtion of SQLMutant tool

This tool is perfectly works on ubuntu 24 system. And I found it is not working properly in kali linux 24 version.   https://github.com/blackhatethicalhacking/SQLMutant/tree/main This tool need to use along with sqlmap tool. Showing this cheat sheet for kali or debian based system.  This tool actually analyze everything and give you the vulnerable url where sql injection is possible. You just need to use then sqlmap to exploit that.   Prerequisite: apt install pipx -y (for ubuntu) pip3 install uro or pipx install uro pipx ensurepath pipx completions  (not needed)  source ~/.bashrc   or restart system If go tool is not installed then run the below two commands first ( golang-go ) or follow this link to install go (https://mahimfiroj.blogspot.com/2024/12/installing-nuclei-in-kali.html) otherwise skip this step.   dpkg -l | grep packagename (Using this command you can check package is installed or not) apt install gccgo-go -y or apt install gol...
Post a Comment
Read more

Install Nessus from docker

Docker installation. Give the below commands one by one. apt install docker-cli or apt install docker.io After the installation is complete, if you are inside wsl then give this command to start docker, because inside wsl systemd (systemctl) does not work: service docker start WSL troubleshooting : If the above command " service docker start " does not work then use below command: dockerd (It may not work if any previous docker process is running. It will show you pid of that process. Use this command to kill that process " kill -9 pid " and run dockerd command again) If " docker ps -a " giving error like " Cannot connect to the Docker daemon at unix:///run/podman/podman.sock. Is the docker daemon running? " This is because you may installed podman-docker package. If you remove the package still you will get this error but you should remove the package. Then issue this command: env | grep -i docker DOCKER_HOST=unix:///run/podman/podman.sock   --...
Post a Comment
Read more

WSL - windows subsystem for linux

  1. From the start menu, type "Turn Windows features on or off". Check the box, Virtual Machine Platform and Windows Subsystem for Linux or in the command prompt simply give this command: wsl.exe --install --no-distribution Now Restart the system.  If wsl is already installed, then give this command: wsl.exe --update 2. Now from Microsoft store download kali linux and install it. Or you can give this command to see list of distributions. Then install based on your choice.  To see list of distributions: wsl.exe --list --online To install: wsl.exe --install --distribution <Distro Name> i.e.  wsl --install --distribution kali-linux 3. Now it will ask for username and password, say at the time of installing kali-linux here. Provide that.  4. Once it is installed, it has come with very minimum package installation.  Run the following commands to install all packages: sudo apt update sudo apt full-upgrade -y sudo apt install -y kali-linux-default (This re...
Post a Comment
Read more