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. For more information on PuTTY, see the PuTTY page. For information on SSH (Secure Shell), see here. For information on Telnet, see here. For information on SFTP secure file transfers, see here. Download PuTTY installation package for Windows Master download site Installation and setup instructions Verifying release signatures Package contents: putty.exe, puttygen.exe, psftp.exe, pscp.exe, pagent.exe Alternatives Server for Windows or other platforms SSH key management needs attention Using telnet is not recommended SFTP file transfer support Screenshots PuTTY terminal window PSFTP command line Use Simon Tatham publishes new PuTTY versions on his personal home page. Installation instructions for Windows Setting up public key authentication using PuTTYgen The releases are signed with GPG, using the PuTTY release key. To verify the signatures, you need the To import the signature key into GPG, use: To check the signature of a file, use: For example: The installation package includes For other SSH clients and comparison, see the SSH clients page. Several more modern alternatives are available. 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 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. 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. 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. In addition to SSH, the PuTTY can be used as a telnet client. Telnet is insecure. Its use is not recommended. The main problem with File transfer support is implemented as a separate program, SCP file transfers are supported via the Modern implementations, such as Tectia SSH, have integrated file transfers in the terminal client.Contents
Download PuTTY installation package for Windows
Master download site
Installation and setup instructions
Verifying release signatures
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
.gpg --import putty-release-2015.asc
gpg --verify <signaturefile> <datafile>
gpg --verify putty-64bit-0.69-installer.msi.gpg putty-64bit-0.69-installer.msi
Package contents: putty.exe, puttygen.exe, psftp.exe, pscp.exe, pagent.exe
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
Server for Windows or other platforms
sudo aptitude install openssh-server
sudo yum install openssh-server
sudo service sshd restart
SSH key management needs attention
Using telnet is not recommended
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
PSFTP.
It is available only as a command-line tool. There is no graphical user interface for file transfers.PSCP
program. This is also command-line only.Screenshots
PuTTY terminal window
PSFTP command line Use
PuTTY - Secure Download (2024)
Table of Contents
Contents
Download PuTTY installation package for Windows
Master download site
Installation and setup instructions
Verifying release signatures
Package contents: putty.exe, puttygen.exe, psftp.exe, pscp.exe, pagent.exe
Alternatives
Server for Windows or other platforms
SSH key management needs attention
Using telnet is not recommended
SFTP file transfer support
Screenshots
PuTTY terminal window
PSFTP command line Use
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