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Puttygen is an open-source tool that helps to generate secure SSH keys, and PuTTY download for Linux, Unix, and Windows operating systems.
PuTTY is an emulator for the Secure Shell (SSH) protocol, which lets you log into a remote machine and execute commands there by typing at the local end and reading the remotely typed responses. It also provides a basic terminal emulation that enables you to do things like copy text from a remote host to your local terminal screen so that it can be printed back on the remote host.
Puttygen is a command line tool with no graphical interface that helps to generate secure ssh keys for PuTTY on Linux. It has both 32-bit and 64-bit versions of the executable programs for different architectures.
This web page is ready PuTTYgen on Linux. For the Windows model, see PuTTYgen on the Windows web page.
Puttygen is the SSH key technology device for the Linux model of PuTTY. It works further to the ssh-keygen device in OpenSSH.
The primary characteristic is to create public and personal key pairs. PuTTY shops keys in its personal layout in .ppk files. However, the device also can convert key formats.
Contents
- Installation
- Creating a New Key Pair for Authentication
- Installing the Public Key as an Authorized Key on a Server
- Changing the Passphrase of a Key
- Exporting a Private Key to Tectia SSH or OpenSSH
- Command Line Options
Installation
Some Linux distributions require the puttygen tool to be installed separately from the putty client. For example, Debian Linux is installed with the following command:
Creating a New Key Pair for Authentication
It is strongly recommended to use a passphrase for key files intended for interactive use. Key files used for automation (e.g. with WinSCP) should generally have a passphrase
Installing the Public Key as an Authorized Key on a Server
To extract the general public key, use:
Then log into the server, edit the authorized_keys report together along with your favorite editor, and cut and paste the general public key output via way of means of the above command to the authorized_keys report. Save the report.
Changing the Passphrase of a Key
It is suggested that every SSH key be regenerated and modified periodically. Universal SSH Key Manager can automate this. Just converting the passphrase isn't any substitute, however, it's far higher than nothing. These commands also can be used to feature a passphrase to a key that changed into created without one.
Use the subsequent command to alternate the passphrase:
This will set off for the brand new passphrase, and write the end result returned to the key file. PPK with the brand new passphrase.
Exporting a Private Key to Tectia SSH or OpenSSH
It is hardly ever important to export a non-public key from PuTTY to Tectia SSH or OpenSSH. However, the procedure is defined here, as it may now and again be important when, for example, a utility is moved to Linux withinside the cloud and the vacation spot server of a record switch can not without difficulty be reconfigured to extrude a licensed key.
Tectia SSH and OpenSSH each help the OpenSSH non-public key document layout, so the usage of that key document layout is defined here. Tectia SSH additionally helps sure different formats.
To convert a current PuTTY non-public key for Tectia or OpenSSH, use the command:
Then reproduction key file to the .ssh listing at the host wherein Tectia or OpenSSH might be run.
Command Line Options
The fundamental command line of PuTTYgen:
- Specifies a key file to read or a key type and size to generate.
- Optional action to perform (e.g., change passphrase)
- Optional output type and output file.
- Keyfile Name of the current key report to read, whilst editing a current key.
- t keytype Specifies the type of a new key to generate. Acceptable values include RSA and DSA. rsa1 is also supported to generate legacy SSH-1 keys, but they should never be needed anymore.
- b bits Specifies the variety of bits withinside the key. For DSA keys, 1024 is a respectable size. For RSA keys, 2048 or maybe 4096 bits are recommended.
- q Suppresses messages approximately development at some stage in key generation.
- C new-remark Specifies remark to explain the important thing. The remark does now no longer affect the operation of the important thing. The remark may be special for brand spanking new keys or for current keys to extrude their remark. Typically the remark might be used to become aware of the important thing owner, however, when you consider that any cost may be special, it can not in reality be relied upon.
- P Requests to alternate the secret's passphrase. The device will activate for a brand new passphrase. It isn't viable to specify a passphrase at the command line. The passphrase could be used to encrypt the personal key. See extra info on passphrases and the way to generate desirable ones.
- antique-passphrase-document document Specifies a document from which to examine the antique passphrase of the key. This is most effective wished if manipulating a present key this is included via way of means of a passphrase.
- new-passphrase document Specifies the new passphrase for the key. This may be used while developing a brand new key, or with the -P choice to extrude the passphrase.
- O output-kind Specifies what to output. By default, the non-public key's output. The following values may be specified:
- personal Save the personal key withinside the proprietary PuTTY key layout as a .ppk file.
- Fingerprint Outputs the fingerprint of the important thing. The fingerprint uniquely identifies the important thing and can, for example, be examined over the telecellsmartphone to make certain the key's the supposed one.
- Public Save the general public key similar to the non-public key. For SSH2 keys, the general public key can be output withinside the layout certain via way of means of RFC 4716. This layout is supported via way of means, e.g., Tectia SSH. Keys in that layout appear to be this:
- Public-OpenSSH Save the general public key only, in OpenSSH's proprietary layout. The layout is likewise supported through Tectia SSH. like this:
- non-public-OpenSSH Converts the non-public key to OpenSSH's format. This can simplest be used for SSH2 keys.
- non-public-sshcom Converts the non-public key to the layout utilized by Tectia SSH.
- non-public-OpenSSH Coverts the non-public key to the layout utilized by OpenSSH. This layout is likewise supported through Tectia SSH.
L Same as -O public-OpenSSH.
p Same as -O public.
- o output-record Specifies the output record. This choice is obligatory while producing a brand new key. Otherwise, while converting the passphrase or comment, the default is to overwrite the unique record. When outputting a public key or fingerprint, the default is trendy output.
- h or --assist Outputs to assist textual content and utilization summary.
- V or --model Outputs model variety of the tool.
- pgpfp Outputs the fingerprints of the PGP Master keys used for signing new variations of PuTTY.
Conclusion
puttygen command line on Linux - SSH key generator helps you to log right into a faraway gadget and execute instructions there via way of means of typing on the nearby give up and studying the remotely typed responses.
It additionally offers a fundamental terminal emulation that allows you to do such things as reproduce textual content from a faraway host for your nearby terminal display in order that it may be published again at the faraway host.
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