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Putty uses mouse movements to collect randomness. Then click Generate, and start moving the mouse within the Window. To create a new key pair, select the type of key to generate from the bottom of the screen (using SSH-2 RSA with 2048 bit key size is good for most people another good well-known alternative is ECDSA).
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Creating a new key pair for authentication Go to Windows Start menu → All Programs → PuTTY → PuTTYgen. For detailed installation instructions, see PuTTY installation instructions. There is no need for a separate PuTTYgen download. PuTTYgen is normally installed as part of the normal PuTTY. Contents PuTTYgen download and install Running PuTTYgen Creating a new key pair for authentication Installing the public key as an authorized key on a server Managing SSH keys Changing the passphase of a key Videos illustrating use of PuTTYgen Using PuTTYgen to generate an SSH key How to set up PuTTY SSH keys for passwordless logins using Pagent PuTTYgen download and install
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