Wednesday, May 15

    Would you like to connect via SSH into Raspberry Pi? No problem, in this article you will see the main methods and tools to do it. If you would like to read more articles about Raspberry PI, please check this page.

    What is SSH?

    SSH is a protocol that allows users to securely log into a remote system and perform various tasks, such as executing commands, transferring files, or forwarding network connections. It was developed as a replacement for less secure protocols like Telnet and FTP, which transmitted data in plaintext, making them vulnerable to eavesdropping attacks.

    Key Components of SSH

    1. Encryption

    One of the fundamental features of SSH is its ability to encrypt data transmitted between a client and a server. This encryption ensures that even if intercepted, the data remains unreadable to unauthorized parties.

    2. Authentication

    SSH uses cryptographic keys to authenticate the parties involved in the communication. This means that both the client and server must have the appropriate keys to establish a connection. This is in contrast to less secure protocols that often rely solely on usernames and passwords.

    3. Integrity Checking

    SSH employs cryptographic hash functions to verify the integrity of data during transmission. This ensures that the data has not been tampered with en route.

    How SSH Works

    1. Client-Server Handshake:
      • The process begins with a client sending a request to connect to a server.
      • The server responds by sending its public key to the client.
      • The client then generates a random session key and encrypts it using the server’s public key. This encrypted session key is sent back to the server.
    2. Authentication:
      • The server uses its private key to decrypt the session key sent by the client.
      • Both the client and server now have a shared session key to encrypt and decrypt data.
    3. Data Transmission:
      • All data transmitted between the client and server is encrypted using the shared session key.
      • Additionally, a message authentication code (MAC) is added to the data to ensure integrity.
    4. Connection Termination:
      • As a result, once the connection is terminated, both the client and server delete the session key, ensuring that it cannot be reused for subsequent sessions.

    Benefits of SSH

    1. Security:
      • SSH encrypts data, making it extremely difficult for attackers to eavesdrop or intercept sensitive information.
    2. Authentication:
      • The use of cryptographic keys provides a robust method for authenticating users and servers, reducing the risk of unauthorized access.
    3. Remote Access:
      • SSH enables users to access and control remote systems securely, allowing for efficient system administration and troubleshooting.
    4. Port Forwarding:
      • Consequently, SSH is capable of forwarding network connections, granting access to services on a remote machine as though they were local.

    SSH into Raspberry PI: solutions

    There a different ways to access SSH into Raspberry PI with all possible devices, such us PC, smartphone, tablets. Here are some good tools:

    The default credentials for Raspberry pi are:

    • username: pi
    • password: raspberry

    By the way, remote SSH access is only possible if the SSH protocol is enabled in the Raspberry Pi OS. The reason is about security , because someone can access your device remotely with this protocol. In order to enable SSH you need to follow these steps:

    • Run sudo raspi-config from command line
    • Interfacing options
    • SSH
    • Enable

    Now you can SSH into a Raspberry PI from your preferred software on the go, without to much problem. I strongly raccomand to change the default credentials to increase your security.

    SSH into Raspberry PI: generate the OS image

    If you need to access SSH into Raspberry PI without any keyboard (headless) how can you achieve it? Of course you can! There is the official tool, called Raspberry PI manager where you can enable when creating the SD card, the SSH protocol. As result you don’t even need to use keyboard, monitor or something like that to open the SSH interface on your Raspberry PI, but you can achieve it directly from that software. Isn’t it cool? As mentioned before, I strongly raccomand you to change the default credentials to improve your security.


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