Jenkins

SSH is just a popular system allowing a shell (command interpreter) to be used over a secure connection. By safe, here, I mean that the connection is protected, authenticated and integrity checked. The encryption stops enemies studying the contents of the data being transmitted, the certification allows both the customer and the machine to be sure that they're connected to the other, and not for some intermediate process in a man-in-the-middle strike, and the integrity checking guarantees that the data isn't being changed during transit. Together, these three functions provide a secure connection.

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However, the password based login function transmits your password through this link, to the remote machine, where it's hashed and compared with the stored value in the password file. To numerous, despite the fact that the connection is secured, this isn't sufficient. SSH allows the usage of public key authentication to login to a machine. Here, you add your public key to the host, and keep your private key on your client device, optionally password protected in order that no-one can steal your private key file and use access to be gained by it without a password.

Now, when the SSH relationship is established, the server will need to check always the authorization of the client; that's, make sure it is you logging in. This was formerly done by requesting your password, and comparing it against the stored password hash. Now, the server encrypts a randomly generated symbol against your public key, and sends this for your requirements. The private key associated with your public key, stored in a document to which only you've access, either by password protection, filesystem permissions and other means, could be the only key in a position to decrypt this message. Now, your SSH customer will decrypt the message and send it back to it is compared by the server, which from the original price. In fact, the validation is frequently also tested in the opposite direction, using the servers public key, which might be kept by your client. When the server knows you support the private key which corresponds to the public key, it allows you access.

Therefore, you may ask, what is the security benefit here? Well, no secret information is being transmitted. You're no longer transmitting a password, nor are you transmitting all of your private key file. You are utilizing the keys to decrypt and encrypt a bit of random data, which works one time only. Anyone who did somehow find a way to listen in on this data flow would not find a way to regain entry by playing back your code, or even by playing back the same data deal, as a different value would be protected the next time you login, and only the private key itself can decrypt that.

Public Key authentication is supported in OpenSSH, and also in PuTTY and a number of other SSH systems. Check always your methods documentation for information on how to use public-key based logins.