ssh-keygen - Creation, management, and conversion of keys used for client and server authentication.
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Synopsis
Creating an SSH key on Windows 1. Check for existing SSH keys. You should check for existing SSH keys on your local computer. You can use an existing SSH key with Bitbucket Server if you want, in which case you can go straight to either SSH user keys for personal use or SSH access keys for system use. Open a command prompt, and run. I need to generate public key to set up in ssh. How do I do it from windows command prompt? I tried using ssh-keygen -t rsa from c: but received a message ssh-keygen is not recognized as an internal or external command, operable program or batch file. Sep 26, 2019 Manually generating your SSH key in Windows. Modified: 26 Sep 2019 21:20 UTC. For Type of key to generate, select SSH-2 RSA. Installation package comes with SSH. Using Git Bash, which is the Git command line tool, you can generate SSH key pairs. Git Bash has an SSH client that enables you to connect to and interact with Triton. Cool Tip: Check the expiration date of the SSL Certificate from the Linux command line! The fastest way! Read more → Create Self-Signed Certificate. Generate self-signed certificate using openssl: $ openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -nodes -days 365 -subj '/CN=localhost'.
Description
You can use the ssh-keygen command line utility to create RSA and DSA keys for public key authentication, to edit properties of existing keys, and to convert file formats. When no options are specified, ssh-keygen generates a 2048-bit RSA key pair and queries you for a key name and a passphrase to protect the private key. Public keys are created using the same base name as the private key, with an added .pub extension. The key location is displayed when key generation is complete.
Options
Specifies the key size. Up to a point, a larger key size improves security. Increasing key size slows down the initial connection, but has no effect on the speed of encryption or decryption of the data stream after a successful connection has been made. The length of key you should use depends on many factors, including: the key type, the lifetime of the key, the value of the data being protected, the resources available to a potential attacker, and the size of the symmetric key you use in conjunction with this asymmetric key. To ensure the best choice for your needs, we recommend that you contact your security officer. Key sizes are rounded up to the next value evenly divisible by 64 bits. The default for DSA keys is 1024 bits; for RSA it is 2048 bits.
Shows the fingerprint of the specified key in SHA-1 Bubble Babble format. You can specify the key file using -f. If you don't specify a file, you are queried for a filename. You can specify the private or public key name, but in either case, the public key must be available.
-c
Requests a change of the comment in the private and public key files. This operation is only supported for RSA1 keys. The program will prompt for the file containing the private keys, for the passphrase if the key has one, and for the new comment.
Specifies information for the comment field within the key file. Use quotation marks if the string includes spaces. If you do not specify a comment when you create a key, a default comment is created that includes the key type, creator, date, and time.
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Uses the specified OpenSSH public or private key to generate a public key in Reflection format. You can specify the key file using -f. If you don't specify a file, you are queried for a filename.
Specifies the filename for the generated private key. (A public key is also created and is always given the same name as the private key plus a .pub file extension.) This option can also be used in combination with -e, -i, -l, -p, -y, and -B to specify the input filename.
Converts the specified Reflection public key to OpenSSH format. You can specify the key file using -f. If you don't specify a file, you are queried for a filename.
Displays a summary of command line options.
Show fingerprint of specified public key file using the MD5 hash. You can specify the key file using -f. If you don't specify a file, you are queried for a filename. If you specify a private key, ssh-keygen tries to find the matching public key file and prints its fingerprint.
Sets the passphrase. For example, to specify the passphrase for a new key:
To create a new key that is not passphrase protected:
You can also use -N in combination with -p and -P to change the passphrase of an existing key.
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Use this option to change the passphrase of an existing private key. If you use this option alone, the program prompts for the file containing the private key, for the old passphrase, and twice for the new passphrase. You can use it in combination with -f, -P, and -N to change the passphrase non-interactively. For example:
Provides the (old) passphrase.
Silence ssh-keygen.
Specifies the algorithm used for key generation. The possible values are 'rsa' or 'dsa' for protocol version 2.
Uses the specified private key to derive a new copy of the public key. You can specify the key file using -f. If you don't specify a file, you are queried for a filename.
Return values
ssh-keygen returns 0 (zero) if the command completes successfully. Any non-zero value indicates a failure.
How to Generate an SSH key in Windows 10
As you may already know, Windows 10 includes built-in SSH software - both a client and a server! This feature is available in the OS starting in version 1803. When the client option is installed, we can use it to generate a new SSH key.
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On Windows machines, the freeware open-source software PuTTY is the de-facto standard when it comes to SSH and Telnet. With Windows 10, Microsoft has finally listened to its users after years of them requesting an SSH client and server. By including an OpenSSH implementation, the value of the OS increases.The provided SSH client is similar to the Linux client. At first glance, it appears to support the same features as its *NIX counterpart. It is a console app, so you should be able to start it from the command prompt.
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To proceed, you need to enable the OpenSSH Client feature. Check out the following text:
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Assuming that you have it installed, you can do the following.
To Generate an SSH key in Windows 10,
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- Open a new command prompt.
- Type
ssh-keygenand hit the Enter key. - The app will ask for the save location, offering
C:usersyour user name.sshid_rsaby default. - Next, you will be prompted to enter a passphrase. You can just hit the Enter key to skip it.
- Finally, you will see the fingerprint for your key and SHA256. The default algorithm is RSA 2048.
You are done. Your public key will be saved to the id_rsa.pub file, by default it is C:usersyour user name.sshid_rsa.pub. You can now upload this file to the target machine you want to access with SSH. Do not share your private SSH key (id_rsa) unless you know what you are doing!
SSH supports a number of other public key algorithms using with keys, such as:
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- rsa - this is a classic algorithm based on the difficulty of factoring large numbers. Recommended keys size - 2048 or above.
- dsa - yet another legacy algorithm based on the difficulty of computing discrete logarithms. It is no longer recommended.
- ecdsa - a new Digital Signature Algorithm standarized by the US government, using elliptic curves. It supports 256, 384, and 521 key sizes.
- ed25519 - this algorithm is the latest options included in OpenSSH. Certain software lacks support for it.
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You can specify the algorithm using the -t option and change the key size using the -b switch. Some examples:
That's it.
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