PuTTY is a client for SSH, Telnet and Rlogin connections. SSH (Secure SHell) is a high-security protocol that uses strong cryptography to protect your connection against eavesdropping, hijacking and other attacks; Telnet and Rlogin are both older protocols offering minimal security. Putty supports SSH1, SSH2 and OpenSSH as well as port and X11 forwarding. You can also use PuTTY to make a raw TCP connection. Session configurations can be saved for later use. Since various existing SSH servers have bugs, PuTTY looks at the version number at the beginning of the SSH connection and will attempt to detect which bugs it can expect to see in the server and automatically enable workarounds.
PuTTY comes with various other tools: PSCP (PuTTY Secure Copy client), a tool for transferring files securely between computers using an SSH connection; PSFTP (PuTTY Secure FTP client), another secure file transfer tool, but using the SSH2's SFTP protocol; Plink (PuTTY Link), a command-line connection tool similar to UNIX ssh, mostly used for automated operations, such as CVS. PuTTYgen (PuTTY key generator), generates pairs of public and private keys, supports RSA and DSA keys; Pageant, an SSH authentication agent: it holds your private keys in memory, already decoded, so that you can use them often without needing to type a passphrase.
Homepage: http://www.chiark.greenend.org.uk/~sgtatham/putty/
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