In contrast with the "password" authentication method where the password is transmitted between the client and the server during the authentication process, the private key contents are not transmitted between the client and the server. Typically the private-key file on the client's machine is protected by a "passphrase", so even if the private-key file is stolen, an attacker must still know the passphrase in order to use it. Public-key authentication is only successful when the client proves that it possesses the "secret" private key linked to the public-key file that the server is configured to use. While the private and public keys within a key pair are related, a private key cannot be derived by someone who only possesses the corresponding public key. The public and private keys are generated with a key generation utility. Public-key authentication employs a linked pair of computer-generated keys - one public and one private - and a procedure that proves the user's identity without exposing the secret key to theft or hijacking.īefore using public-key authentication, the public/private key pair files must be created, with a copy of the public-key file being uploaded to a specific location on the server. Public-key authentication is a proven, well-established method for authenticating computing devices which is more secure than password authentication. Overview of public-key authentication for Secure Shell The tip below provides a basic overview of public-key authentication, explains how to generate and upload keys to the Secure Shell server, and shows how to configure SecureCRT and SecureFX clients. Do not use common words or names, and use a combination of upper- and lowercase characters to maximize the security of your password.Index Using Public-Key Authentication in Secure Shell Applications Passwords must be at least eight characters long and have a minimum of one non-alphabetical character in the first eight characters. Your SIS password will expire every five weeks and must be changed automatically at that time.
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