SSH, which stands for Secure Shell, is a cryptographic network protocol that allows for secure communication and data transfer between two computers over an insecure network.


  1. Remote Login and Command-Line Execution: SSH allows users to remotely log in to a computer and execute commands as if they were sitting directly in front of it. This is particularly useful for system administrators who need to manage servers that are located in different physical locations.
  2. Secure File Transfer: SSH can be used to securely transfer files between two computers. This is a safer alternative to using FTP (File Transfer Protocol), which transmits data in plain text.
  3. Tunneling: SSH can be used to create secure tunnels through an insecure network. This allows traffic from other protocols, such as HTTP or HTTPS, to be encrypted and sent over the SSH connection.

Key features of SSH:

  • Encryption: All data transmitted over an SSH connection is encrypted using strong cryptographic algorithms, making it very difficult for anyone to intercept and read the data.
  • Authentication: SSH uses various authentication methods, such as passwords, public key cryptography, and two-factor authentication, to verify the identity of users attempting to connect.
  • Data Integrity: SSH ensures that data is not tampered with during transmission by using checksums and other techniques.
  • Compression: SSH can compress data to improve transfer speeds.

Applications of SSH:

  • Server Access: Access EC2 Instances using SSH or Ansible.
  • Git: SSH to access and manage code repositories.
  • SFTP: Web developers use SSH to deploy websites to web servers.

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Javier Ruiz Cloud and SaaS Expert

Javier Ruiz

IT Wonder Lab tutorials are based on the diverse experience of Javier Ruiz, who founded and bootstrapped a SaaS company in the energy sector. His company, later acquired by a NASDAQ traded company, managed over €2 billion per year of electricity for prominent energy producers across Europe and America. Javier has over 25 years of experience in building and managing IT companies, developing cloud infrastructure, leading cross-functional teams, and transitioning his own company from on-premises, consulting, and custom software development to a successful SaaS model that scaled globally.

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