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Command and Option Summary What Is ssh-keygen? Ssh-keygen is a tool for creating new authentication key pairs for SSH. Such key pairs are used for automating logins, single sign-on, and for authenticating hosts. The authentication keys, called SSH keys , are created using the keygen program. SSH introduced public key authentication as a more secure alternative to the older.

It improved security by avoiding the need to have password stored in files, and eliminated the possibility of a compromised server stealing the user’s password. However, SSH keys are authentication credentials just like passwords. Thus, they must be managed somewhat analogously to user names and passwords.

They should have a proper termination process so that keys are removed when no longer needed. In this case, it will prompt for the file in which to store keys. Here’s an example: Enter passphrase empty for no passphrase: Enter same passphrase again: The key fingerprint is: SSH keys for user authentication are usually stored in the user’s.

However, in enterprise environments, the location is often different. Then it asks to enter a passphrase. The passphrase is used for encrypting the key, so that it cannot be used even if someone obtains the private key file. The passphrase should be cryptographically strong. Our online random password generator is one possible tool for generating strong passphrases. These include: A key size of at least bits is recommended for RSA; bits is better. RSA is getting old and significant advances are being made in factoring.

Choosing a different algorithm may be advisable. It is quite possible the RSA algorithm will become practically breakable in the foreseeable future. All SSH clients support this algorithm. It is based on the difficulty of computing discrete logarithms.

A key size of would normally be used with it. DSA in its original form is no longer recommended. This is probably a good algorithm for current applications. Only three key sizes are supported: We would recommend always using it with bits, since the keys are still small and probably more secure than the smaller keys even though they should be safe as well.

Most SSH clients now support this algorithm. Support for it in clients is not yet universal. Thus its use in general purpose applications may not yet be advisable. The algorithm is selected using the -t option and key size using the -b option. The following commands illustrate: This can be conveniently done using the ssh-copy-id tool. Like this: During the login process, the client proves possession of the private key by digitally signing the key exchange.

Adding the Key to SSH Agent ssh-agent is a program that can hold a user’s private key, so that the private key passphrase only needs to be supplied once. A connection to the agent can also be forwarded when logging into a server, allowing SSH commands on the server to use the agent running on the user’s desktop.

For more information on using and configuring the SSH agent, see the ssh-agent page. Creating Host Keys The tool is also used for creating host authentication keys. Host keys are just ordinary SSH key pairs. Each host can have one host key for each algorithm. The host keys are almost always stored in the following files: They can be regenerated at any time. However, if host keys are changed, clients may warn about changed keys.

Changed keys are also reported when someone tries to perform a man-in-the-middle attack. Thus it is not advisable to train your users to blindly accept them. Changing the keys is thus either best done using an SSH key management tool that also changes them on clients, or using certificates.

Using X. Tectia SSH does support them. They also allow using strict host key checking, which means that the clients will outright refuse a connection if the host key has changed. For user authentication, the lack of highly secure certificate authorities combined with the inability to audit who can access a server by inspecting the server makes us recommend against using OpenSSH certificates for user authentication. However, OpenSSH certificates can be very useful for server authentication and can achieve similar benefits as the standard X.

However, they need their own infrastructure for certificate issuance. See more information on certificate authentication. In the default configuration, OpenSSH allows any user to configure new keys.

The keys are permanent access credentials that remain valid even after the user’s account has been deleted. In organizations with more than a few dozen users, SSH keys easily accumulate on servers and service accounts over the years. We have seen enterprises with several million keys granting access to their production servers. It only takes one leaked, stolen, or misconfigured key to gain access. In any larger organization, use of SSH key management solutions is almost necessary.

SSH keys should also be moved to root-owned locations with proper provisioning and termination processes. For more information, see how to manage SSH keys. Practically all cybersecurity regulatory frameworks require managing who can access what. SSH keys grant access, and fall under this requirement.

This, organizations under compliance mandates are required to implement proper management processes for the keys. There have been incidents when thousands of devices on the Internet have shared the same host key when they were improperly configured to generate the key without proper randomness. It may be something of an issue when initially installing the SSH server and generating host keys, and only people building new Linux distributions or SSH installation packages generally need to worry about it.

Our recommendation is to collect randomness during the whole installation of the operating system, save that randomness in a random seed file. Then boot the system, collect some more randomness during the boot, mix in the saved randomness from the seed file, and only then generate the host keys. This maximizes the use of the available randomness.

And make sure the random seed file is periodically updated, in particular make sure that it is updated after generating the SSH host keys. Many modern general-purpose CPUs also have hardware random number generators.

This helps a lot with this problem. The best practice is to collect some entropy in other ways, still keep it in a random seed file, and mix in some entropy from the hardware random number generator. This way, even if one of them is compromised somehow, the other source of randomness should keep the keys secure. Embedded Devices and Internet of Things Available entropy can be a real problem on small IoT devices that don’t have much other activity on the system.

They may just not have the mechanical randomness from disk drive mechanical movement timings, user-caused interrupts, or network traffic. Furthermore, embedded devices often run on low-end processors that may not have a hardware random number generator.

Our recommendation is that such devices should have a hardware random number generator. If the CPU does not have one, it should be built onto the motherboard. The cost is rather small. Command and Option Summary Here’s a summary of commonly used options to the keygen tool: The regulations that govern the use case for SSH may require a specific key length to be used.

In general, bits is considered to be sufficient for RSA keys. Commonly used values are:

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