Jiakuang He

How To Use SSH To Login

ssh username@server

Example

ssh root@10.1.0.101

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If we press no, the ssh will disconnect.

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For safety reason, any input here will not be shown.

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Permission denied, please try again.

If the password is wrong, you will get the tips Permission denied, please try again.

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Passwordless login

1. Create a ssh key

   ssh-keygen

Press down enter to save the default directory

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2. ssh-copy-id

ssh-copy-id username@server_ip

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How they work

Server 10.1.0.101

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Connected Server 10.1.0.102

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Untitled Diagram.drawio

RSA

RSA (Rivest–Shamir–Adleman) is a public-key cryptosystem that is widely used for secure data transmission.

RSA (cryptosystem) - Wikipedia

public key and private key

In a public-key cryptosystem, the encryption key is public and distinct from the decryption key, which is kept secret (private).

public key: send to others, can be public

private key: secret key, we need to make it safe