OpenSSH: The ssh-keygen utility will convert a key file from a number of formats to the OpenSSH format, including from the SECSH Public Key File Format used by a number of commercial SSH implementations. Using SSH for Automatic Key authentication. SSH provides an encrypted tunnel for use with interactive and non interactive terminal sessions. It provides authentication via a number of methods including password, public/private key pairs and challenge keys.
Using SSH for Automatic Key authentication SSH provides an encrypted tunnel for use with interactive and non interactive terminal sessions. It provides authentication via a number of methods including password, public/private key pairs and challenge keys. SSH also provides authentication forwarding between machines. This feature allows a user to be able to log on to a machine without the need of typing a password. This is an extreemly strong feature as it means you can provide access to an account or even to execute a command without the need to provide someone with a password. In order to setup public/private key authentication forwarding both the client and the server must have knowledge of the relevant keys.
You must also consider the version of SSH software that the server/client is running as different versions use different files. Generating SSH Keys The first step is to generate an SSH private/public key pair. For this I assume you are using some version of OpenSSH. There is currently three types of ssh key pairs that can be generated. They are rsa1, rsa and dsa.
Ssh Keygen For Mac
Of these dsa is the most secure and is the one used by ssh2. To generate the key perform the following: ssh-keygen -t rsa1 ssh-keygen -t rsa ssh-keygen -t dsa The public/private keys will be installed in the following places SSH Version Key Type OpenSSH SSH 2(Commercial) old ssh1 rsa1 /.ssh/identity & /.ssh/identity.pub Not Generatable ssh1 rsa2 /.ssh/idrsa & /.ssh/idrsa.pub /.ssh2/idrsakeywidtha & /.ssh2/idrsakeywidtha.pub ssh2 dsa /.ssh/iddsa & /.ssh/iddsa.pub /.ssh2/iddsakeywidtha &/.ssh2/iddsakeywidtha.pub Automated Authentication With the keys generated it is now possible to setup automatic key authentication.
This means when you log in to a machine you don’t need to enter your password. The authentication happens by the server encrypting some data with your public key then challenging the client to decript it. For this to happen, the client must have the private key matching the public key. The procedure to set this up varies up which server you attempting to access.
The procedure is basically as follows: scp publickey: ssh cat publickey filename The above is the basic procedure. However the publickey and filename vary depending on the server/client you are using.