Use a PuTTY generated key on Mac OSX. Eoin Guides January 31, 2010 January 31, 2010. I wanted to use the key I generated using the PuTTYGen tool on my windows laptop, on my now repaired Mac Pro. The standard PuTTY generated key will not work on Linux or Mac OSX, so the key needs to be converted into a standard that will, like OpenSSH. Download PuTTY. PuTTY is an SSH and telnet client, developed originally by Simon Tatham for the Windows platform. PuTTY is open source software that is available with source code and is developed and supported by a group of volunteers. Jun 23, 2017 The pre-built bottle for putty doesn’t include putty, puttytel or pterm. If you want putty then can try installing from source. First remove the installed putty formula by running brew remove putty. After that install putty from source by running brew install –build-from-source –with-gtk+3 putty. This page contains download links for the latest released version of PuTTY. Currently this is 0.73, released on 2019-09-29. When new releases come out, this page will update to contain the latest, so this is a good page to bookmark or link to.
PuTTY is a popular SSH, Telnet, and SFTP client for Windows. It is typically used for remote access to server computers over a network using the SSH protocol. This is the download page.
Puttygen Mac Ppk
For more information on PuTTY, see the PuTTY page. For information on SSH (Secure Shell), see the here. For information on Telnet, see here. For information on SFTP secure file transfers, see here.
Download PuTTY installation package for WindowsPuttygen Free Download For Mac
Installation and setup instructionsVerifying release signatures
The releases are signed with GPG, using the PuTTY release key.
To verify the signatures, you need the
gpg tool. On Debian-based Linux, it can be installed with aptitude install gnupg . On Red Hat 7, it can be installed with yum install gnupg2 .
To import the signature key into GPG, use:
To check the signature of a file, use:
For example:
Package contents: putty.exe, puttygen.exe, psftp.exe, pscp.exe, pagent.exe
The installation package includes
putty.exe , puttygen.exe , psftp.exe , pscp.exe , and pagent.exe .
putty.exe is the main executable for the terminal client. It can also be used standalone, without the installation package, by simply copying the executable to a USB stick and running it on a new machine. This way, the user can carry the executable with them. However, this should not be assumed to provide great security - malware on the machine where it is used can still compromise the software (cf. CIA hacking tool bothanspy) and viruses may get installed on the USB stick whenever it is inserted in a new machine.
puttygen.exe is can be used for generating SSH keys on Windows. See the separate puttygen page on how to create and set up SSH keys with it.
psftp.exe is an SFTP file transfer client. It only works on the command line, and does not support graphically dragging and dropping files between systems. See Tectia SSH if you'd like that functionality.
pscp.exe is a command line SCP client.
pagent.exe is an SSH agent for PuTTY. Keys are first created with puttygen.exe and can then be loaded into pagent for automating logins and for implementing single sign-on.
Alternatives
For other SSH clients and comparison, see the SSH clients page. Several more modern alternatives are available.
Server for Windows or other platforms
You don't need to worry about a server if you are going to connect to a school or work server. However, if you are planning to use PuTTY to log into your own systems, then you may need to install and enable a server.
Most Linux and Unix systems come with OpenSSH preinstalled. On some distributions, you may need to install the server. On Debian-derived systems, the following will install the server:
On Red Hat systems, the following will install the server:
Depending on the system, you may also need to start the server if you don't want to reboot. The following should work on most systems:
For Windows, the Tectia SSH is a popular choice and comes with commercial support services. It also runs on IBM z/OS mainframes. Unix/Linux are available with support for business-critical applications.
SSH key management needs attention
SSH is often used with public key authentication to implement automation and single sign-on.
Public key authentication uses a new kind of access credential, the SSH key, for authentication. It is much more secure than traditional password authentication, especially compared to hard-coded passwords in scripts, but the keys need proper management.
Putty And Puttygen For Mac
Most organizations with more than a hundred servers have large numbers of SSH keys. Usually, these keys have not been properly managed and audited. An SSH risk assessment is recommended. Organizations should consider deploying key management software to establish proper provisioning, termination, and monitoring for key-based access.
Risks of unmanaged SSH keys include uncontrolled attack spread across the server infrstructure, including to disaster recovery data centers and backup systems. It could potentially destroy a Fortune 500 enterprise.
Organizations should also be aware of security risks related to SSH port forwarding. It is a technology that has many good uses, but it can also enable unfettered access across firewalls. Employees and attackers can leave tunnels back into the internal network from the public Internet. This particularly affects organizations using cloud computing services.
Using telnet is not recommended
In addition to SSH, the PuTTY can be used as a telnet client. Telnet is insecure. Its use is not recommended.
Putty For Mac Download
The main problem with
telnet is that it transmits all passwords and any transmitted data in the clear. Anyone with access to any computer on the same network can steal user names and passwords that are transmitted. Such password sniffing attacks were very common on the Internet already in the 1990s.
Telnet sessions can also be hijacked in the network. Attackers can inject their own commands into telnet sessions. Protection from such attacks was the main reason why Tatu Ylonen developed SSH as a replacement for telnet in the first place. Use of telnet has not been recommended for 20 years.
SFTP file transfer support
File transfer support is implemented as a separate program,
PSFTP. It is available only as a command-line tool. There is no graphical user interface for file transfers.
SCP file transfers are supported via the
PSCP program. This is also command-line only.
Modern implementations, such as Tectia SSH, have integrated file transers in the terminal client.
Master download site
Simon Tatham publishes new PuTTY versions on his personal home page. The files are mirrored here at ssh.com. If you notice any issues or the version hasn't been updated properly, please drop an email to ylo at ssh.com. Please note that I do not provide support services for PuTTY. I merely maintain this mirror to have a single place for downloading popular SSH versions.
ScreenshotsPuTTY terminal windowPSFTP command line Use
This page is about PuTTYgen on Linux. For the Windows version, see the PuTTYgen on Windows page.
Puttygen is the SSH key generation tool for the linux version of PuTTY. It works similarly to the ssh-keygen tool in OpenSSH.
The basic function is to create public and private key pairs. PuTTY stores keys in its own format in
.ppk files. However, the tool can also convert key formats.
Installation
In some Linux distributions, the
puttygen tool needs to be installed separately from the Putty client. For example, in Debian Linux, the following command will install it:
Creating a New Key Pair for Authentication
To create a new key pair for authentication from the command line, use something like:
It is strongly recommended that a passphrase be used for key files intended for interactive use. Key files used for automation (e.g., with WinSCP should generally have an empty passphrase.
Installing the Public Key as an Authorized Key on a Server
With both Tectia SSH and OpenSSH servers, access to an account is configured by generating a public key, copying the public key to the server, and adding the public key to a ~/.ssh/authorized_keys file.
To extract the public key, use:
Then log into the server, edit the
authorized_keys file with your favorite editor, and cut-and-paste the public key output by the above command to the authorized_keys file. Save the file. Configure PuTTY to use your private key file (here keyfile.ppk ). Then test if login works. See configuring public key authentication for PuTTY.
Changing the Passphase of a Key
It is recommended that all SSH keys be regenerated and changed periodically. The Universal SSH Key Manager can automate this. Just changing the passphrase is no substitute, but it is better than nothing. These instructions can also be used to add a passphrase to a key that was created without one.
Use the following command to change the passphrase:
This will prompt for the new passphrase, and write the result back to
keyfile.ppk with the new passphrase.
Exporting a Private Key to Tectia SSH or OpenSSH
It is rarely necessary to export a private key from PuTTY to Tectia SSH or OpenSSH. However, the process is described here, as it can sometimes be necessary when, for example, an application is moved to Linux in the cloud and the destination server of a file transfer cannot easily be reconfigured to change an authorized key.
Tectia SSH and OpenSSH both support the OpenSSH private key file format, so using that key file format is described here. Tectia SSH also supports certain other formats.
To convert an existing PuTTY private key for Tectia or OpenSSH, use the command: Todoist free for mac.
Then copy
keyfile to the .ssh How to format seagate hard drive for mac. directory on the host where Tectia or OpenSSH will be run.
Command Line Options
The basic command line of PuTTYgen:
The basic command line is:
The options are:
keyfile Name of existing key file to read, when modifying an existing key.
-t keytype Specifies to 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 any more.
-b bits Specifies the number of bits in the key. For DSA keys, 1024 is a decent size. For RSA keys, 2048 or even 4096 bits are recommended.
-q Suppresses messages about progress during key generation.
-C new-comment Specifies comment to describe the key. The comment does not impact the operation of the key. The comment can be specified for new keys or for existing keys to change their comment. Typically the comment would be used to identify the key owner, but since any value can be specified, it cannot really be relied upon.
-P Requests to change the key's passphrase. The tool will prompt for a new passphrase. It is not possible to specify a passphrase on the command line. The passphrase will be used to encrypt the private key. See more details on passphrases and how to generate good ones.
--old-passphrase-file file Specifies a file from which to read the old passphrase of the key. This is only needed if manipulating an existing key that is protected by a passphrase.
--new-passphrase file Specifies new passphrase for the key. This can be used when creating a new key, or with the -P option to change the passphrase.
-O output-type Specifies what to output. By default, the private key is output. The following values can be specified:
-l Same as -O fingerprint.
-L Same as -O public-openssh.
-p Same as -O public.
-o output-file Specifies the output file. This option is mandatory when generating a new key. Otherwise, when changing the passphrase or comment, the default is to overwrite the original file. When outputting a public key or fingerprint, the default is standard output.
-h or --help Outputs help text and usage summary.
-V or --version Outputs version number of the tool.
--pgpfp Outputs the fingerprints of the PGP Master keys used for signing new versions of PuTTY.
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