PuttyGen : generate public and private keys used to login Linux after configuration without password,convinent.

private key - keeped in localhost, and located into putty Authen.

public key - transmit to linux server,under /root/.ssh folder.

Then:

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vi /etc/ssh/sshd_config:

protocal 2

PubKeyAuthentiction yes

AuthorizedKeysFile .ssh/pubkey_filename

StrictModes no

:wq!

/etc/init.d/sshd reload

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after above all,Linux can easilly logged in without passwd.

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SSH PuttyGen