general file transfer sessions much like FTP)
PuTTY (the Telnet and SSH client itself). This download includes the following tools: So you can work on the Unix machine as if you were sitting at its console, while actually sitting somewhere else. Then, anything you type into that window is sent straight to the Unix machine, and everything the Unix machine sends back is displayed in the window. In really simple terms: you run PuTTY on a Windows machine and tell it to connect to (for example) a Unix machine. PuTTY 64 bit implements the client end of that session: the end at which the session is displayed, rather than the end at which it runs. These protocols are all used to run a remote session on a computer, over a network. It is written and maintained primarily by Simon Tatham. As for encryption, it provides state-of-the-art encryption and security measures suitable as part of a standards-compliant solution meeting the requirements of PCI, HIPAA, or FIPS 140-2 validation.PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, along with an xterm terminal emulator. 
SSH client supports all desktop and server versions of Windows, 32-bit and 64-bit, from Windows XP SP3 and Windows Server 2003, up to the most recent – Windows 10 and Windows Server 2016. Some authentication methods include public key authentication, one-time passwords with s/key and authentication using Kerberos (only in -portable).
Strong authentication (public keys, one-time passwords) – Strong authentication protects against several security problems: IP spoofing, fakes routes and DNS spoofing.A number of different ciphers and key types are available, and legacy options are usually phased out in a reasonable amount of time. Encryption is also used to protect against spoofed packets. Strong cryptography (AES, ChaCha20, RSA, ECDSA, Ed25519…) – Encryption is started before authentication, and no passwords or other information is transmitted in the clear.
The service side consists of sshd, sftp-server, and ssh-agent. Key management with ssh-add, ssh-keysign, ssh-keyscan, and ssh-keygen. Remote operations are done using ssh, scp, and sftp. The OpenSSH suite consists of the following tools: Additionally, OpenSSH provides secure tunneling capabilities and several authentication methods, and supports all SSH protocol versions. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks. OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
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