How can I use a passcode generator for authentication for remote logins?


want to disable ssh clients from accessing using the password and only allow ssh login using SSH keys. How do I disable password authentication for SSH on Linux operating systems?

First, you need to setup a normal user account. Next, configure SSH keys for login. Once you have SSH Keys configured, you need to disable password login for all users include root. In this guide,

shows you how to generate an ssh key and disable password authentication on the Linux or Unix-based system

. For demo purpose I am using a Ubuntu Linux here.

Step 1 – Login to the remote server

Use the ssh command or client such as Putty:
$ ssh root@server-ip-here
$ ssh

Step 2 – Create a new user account

Type the following command on Linux based system to create a new user named vivek:
# useradd -m -s /bin/bash vivek
Set the user’s password:
# passwd vivek
Sample outputs:

Enter new UNIX password:...
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Posted by Steve on Fri 3 Jun 2005 at 09:45

Because OpenSSH allows you to run commands on remote systems, showing you the results directly, as well as just logging in to systems it's ideal for automating common tasks with shellscripts and cronjobs. One thing that you probably won't want is to do though is store the remote system's password in the script. Instead you'll want to setup SSH so that you can login securely without having to give a password.

Thankfully this is very straightforward, with the use of public keys.

To enable the remote login you create a pair of keys, one of which you simply append to a file upon the remote system. When this is done you'll then be able to login without being prompted for a password - and this also includes any cronjobs you have setup to run.

If you don't already have a keypair generated you'll first of all need to create one.

If you do have a keypair handy already you can keep using that, by default the keys...

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KnowBe4’s password-less logins feature allows your users to log in to their assigned training directly without requiring them to use a password. You can quickly enable this feature in your Account Settings and use our specially-designed training notifications to let your users access training through this password-less method.

What are Password-Less Logins?
How to Set Up Password-Less Logins
Best Practices for Password-Less Logins
Frequently Asked Questions (FAQs)

What are password-less logins and how do they differ from the standard login method?

By default, KnowBe4’s training platform will enable your users to set a password for their training account once they confirm their account and log in for the first time (or, alternatively, admins may set a password for their users once they are imported into the console).

Enabling password-less logins will instead email a customized link to users as part of their invitation to...

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This chapter describes how to manage Oracle Communications Billing and Revenue Management (BRM) customer authentication, including login names, passwords, and security codes.

About Customer Authentication and Authorization

Authentication verifies a customer's identity. By default, this is accomplished by checking the customer's login name and password.

Authorization verifies that a customer is allowed to use the service. A user might not be authorized if the service is inactive or if a credit limit has been reached.

Authorization requires that authentication occur first, so that BRM knows who is being authorized.

To customize authentication, you need to edit the PCM_OP_ACT_POL_SPEC_VERIFY policy opcode. For example, you can change the requirements for authentication. See "Authenticating Customers by Using Your Custom Application".

You use the pin_ipass_loader utility to customize authorization for IP services.

About Login Names and...

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Good passwords are one of the simplest parts of good network security. Passwords are used to log in to systems that use password authentication. Popular mythology says that network security breaches are caused by sophisticated security crackers who discover software security holes to break into computer systems. In reality, many intruders enter systems simply by guessing or stealing passwords, or by exploiting well-known security problems in outdated software. Later in this chapter we look at guidelines for keeping software up-to-date, and at ways to prevent a thief from stealing your password. First, let's see what we can do to prevent it from being guessed.

These are a few things that make it easy to guess passwords:

Accounts that use the account name as the password. Accounts with this type of trivial password are called joe accounts .

Guest or demonstration accounts that require no password, or use a well-publicized password.


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How to request an RSA token?
To request an RSA token:

Log into the RUNet Account Management website at Click Manage Your Account and then log in. Click Request RSA Token and follow the prompts.

Alternatively, request an RSA token by contacting the IT Help Desk at x8940. Users must specify if they want a software token (available for iOS and Android devices) or hardware token (keyfob). You only need one token and can use it to log in to VPN from any computer or device.

What is an RSA SecurID Token (RSA Token)?
An RSA token is a small hardware device (called a hardware token or keyfob) or a mobile app (called a software token) for logging in to a system using two-factor authentication -- a method in which the user provides two means of identification. At Rockefeller, it is used to log in to VPN. To use the token:

If using a software token: launch the RSA SecurID app and enter your PIN number. The token will then generate a...
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