![]() $ ssh -l fred WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. It can be sent ahead of time by post, fax, SMS or a phone call instead or otherwise communicated in some way such that you can be sure it is authentic and unchanged. The verification data for the key should be sent out of band. Fingerprints can be transferred out of band and loaded into either the ~/.ssh/known_hosts or /etc/ssh/ssh_known_hosts files in advance of the first connection. A fingerprint is a hash or digest of the public key. One important use for key fingerprints is when connecting to a machine for the first time. Also, although DSA keys can be generated, they are deprecated and should be replaced if found. However, SSH1 is long since deprecated and the systems should be re-tooled if found in use. If the legacy protocol, SSH1, is used, then ssh-keygen(1) can only generate RSA keys. load or read a key to or from a smartcard, if the reader is available.show ASCII art fingerprint of a specific public key.show the fingerprint of a specific public key.change the comment text of a private key.regenerate a public key from a private key.generate new key pairs, either ECDSA, Ed25519, RSA, ECDSA-SK or Ed25519-SK.It works with SSH keys and can do the following activities: Ssh-keygen(1) is for generating key pairs or certificates for use in authentication, update and manage keys, or to verify key fingerprints. ![]() David Mazieres wrote the initial version of ssh-keyscan(1) and Wayne Davison added support for SSH protocol version 2. The default is to request a ECDSA key using SSH protocol 2. Keys retrieved using ssh-keyscan(1), or any other method, must be verified by checking the key fingerprint to ensure the authenticity of the key and reduce the possibility of a man-in-the-middle attack. Ssh-keyscan(1) has been part of the OpenSSH suite since OpenSSH version 2.5.1 and is used to retrieve public keys. ![]() The agent holds the private keys used for authentication. It can also be used to remove identities from the agent. Ssh-add(1) is a tool to load key identities into an agent for re-use. The environment variable SSH_AUTH_SOCK points applications to the socket used to communicate with the agent. Usually it is started at the beginning of a session and subsequent windows or programs run as clients to the agent. Ssh-agent(1) is a tool to hold private keys in memory for re-use during a session.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |