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Then I used ssh-keygen -y (mentioned in how can I check my rsa passphrase?) to get the SSH public key. However, the public key obtained using this method contains "ssh-rsa AAA...idJ" only. (i.e. it does not have the last part " tom@toms-MacBook-Pro.local")
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If you're using the traditional-format id_rsa key file (the one that starts with "RSA PRIVATE KEY"), it simply did not have any standard place to store the comment, so ssh-keygen has nowhere to get it from. (It's a generic key format that OpenSSH adopted because its crypto library already had it.)
The "new" OpenSSH private key format (the one which says "OPENSSH PRIVATE KEY") does have a comment field and ssh-keygen can extract it just fine. If you want to convert your private key, you can use ssh-keygen -p on new OpenSSH versions; ssh-keygen -o -p on slightly older ones, followed by actually setting a new comment using ssh-keygen -c.
I used SSH to remotely connect to thousands of customer machines during my time as a support engineer, and I am sure that others have had a similar experience. With traditional SSH authentication, you need the username and password for the account you want to log in to every time that you wish to access a system. Doesn't sound that bad, right? But, what happens when you need to jump back and forth between systems regularly? Or what if your responsibilities include remote sessions to the same 100 systems throughout the day for health checks? There is another way to accomplish the log in, and with a little upfront investment, it can be far more efficient overall.
Most authentication in Windows environments is done with a username-password pair, which works well for systems that share a common domain. When working across domains, such as between on-premises and cloud-hosted systems, it becomes vulnerable to brute force intrusions.
To use key-based authentication, you first need to generate public/private key pairs for your client. ssh-keygen.exe is used to generate key files and the algorithms DSA, RSA, ECDSA, or Ed25519 can be specified. If no algorithm is specified, RSA is used. A strong algorithm and key length should be used, such as Ed25519 in this example.
The service checks if a particular host key doesn't exist, and runs the script which just calls ssh-keygen to create them. So, if the host keys don't exist or get deleted, they're regenerated the next time they're needed.
It mentions removing "sshd-keygen, a legacy Fedora init script" (and replace it with a proper systemd service) and mentions "Applications/services that needs to make sure that ssh host keys are available".
I want to use rsync command between two computers and both of them have RedHat 5.3 , when I googled for way to make that, I discovered that I have to make public key between them to not prompt password when I use rsync command. What is the best way to get a public key and make rsync work perfectly.
When you want to use ssh with keys, the first thing that you will need is a key.creating key using dsa encryption (or replace dsa by rsa for rsa encryption)$ ssh-keygen -t dsaWhen asked for a "passphrase", we won't enter one. Just press enter twice. The ssh-keygen program will now generate both your public and your private key, by default, your keys are stored in the .ssh/ directory in your home directory.
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Logging into remote systems with SSH implementations is secure by default -- but those connections are secured only in that they use the TLS protocol to encrypt network protocol exchanges. SSH can be made even more secure by using it to authenticate communicating hosts through the exchange of public keys -- keys that are created using the ssh-keygen command.
GUI versions of SSH usually include the same functionality as the command-line versions. For example, the PuTTYgen program is a GUI version of ssh-keygen for use with PuTTY, a GUI implementation of SSH for Windows. However, modern OSes, including Windows 10 and later, Linux and macOS, include command-line versions of the OpenSSH implementation of SSH.
SSH depends on public key authentication to negotiate a secure connection between an SSH client and an SSH server. SSH is often used to make an ad hoc connection between the client and the remote server without a previously created public key pair, for example, with a command like this:
In this example, an SSH connection is initiated between the SSH client and the SSH server on the same host using the loopback address, 127.0.0.1. This address is often used for testing purposes and directs all network traffic to client and server software running on the local computer. The default client connection in this example uses an Elliptic Curve Digital Signature Algorithm (ECDSA) key. 350c69d7ab