SSH Protocol: Quick Explanation

The SSH protocol is also referred to as Secure Shell. It is mainly used to communicate one desktop to another remote desktop by maintaining confidentiality and integrity.

You can understand the usage of the ssh protocol by taking an example. Suppose you are at home, and you got a call from your boss to provide a critical file stored on your office computer. Here ssh protocol solves your problem. It securely connects your office computer to your home desktop for completing the task.

It provides strong authentication by implementing the public-key cryptography technique. It also provides integrity by using a standard hash algorithm such as SHA-2 and communication data security by using a strong encryption algorithm such as Advanced Encryption Standard. This protocol is an alternative to telnet, rlogin, non-protected login protocols, and FTP, which is insecure file transfer methods.

How Does SSH Protocol Work?

It works based on the client-server model. It implies the client sends a request to communicate with the server. Once the client confirms the server's identity using public-key cryptography, it established the connection between client and server. Later both exchange data by using cryptography algorithms for encryption and hashing.

To summarize, here are the steps mentioned below for connecting ssh client to ssh server:
Step 1: Client sends a request for connecting server
Step 2: Server share public keys
Step 3: On exchanging more keys and confirms identity, it opens up a secure communication
Step 4: The user can log in to the server’s operating system.

Applications of SSH Protocol

It helps a lot of professionals in achieving security objectives in many ways which include:

  • Helps in diagnosis network problems by issuing network command remotely
  • Transfer files securely
  • Helps in establishing secure connections to users and automated processes
  • It helps in mitigating man-in-the-middle attacks and secures the communication channel

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Disclaimer: This tutorial is for educational purpose only. Individual is solely responsible for any illegal act.

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