Windows, YubiKey, GPG, Putty: Setting Up SSH with a YubiKey

Windows, YubiKey, GPG, and PuTTY: Setting up SSH with YubiKey

In this article, we will discuss how to set up SSH using YubiKey, GPG, Windows, and PuTTY. We will cover key concepts, including creating GPG subkeys, storing them on a YubiKey, enabling SSH and PuTTY support in the GPG agent configuration file, and accessing a server.

Prerequisites

Before we begin, ensure you have the following:

• A Windows computer
• A YubiKey
• GnuPG (GPG) installed on your Windows computer
• PuTTY installed on your Windows computer

Creating GPG Subkeys and Storing Them on YubiKey

First, we need to create GPG subkeys and store them on the YubiKey. To do this, open a command prompt and run the following commands:

Replace with the email address associated with your GPG key.

Enabling SSH and PuTTY Support in GPG Agent Configuration File

Next, we need to enable SSH and PuTTY support in the GPG agent configuration file. To do this, open the configuration file using a text editor and add the following lines:

Replace /path/to/gpg-agent.env with the path to the gpg-agent.env file.

Accessing a Server

Finally, we can access a server using SSH and YubiKey. To do this, open PuTTY and enter the server's IP address or hostname. Then, follow these steps:

1. Go to Connection > SSH > Auth.
2. Under "Private key file for authentication," browse to the gpg-agent.env file.
3. Under "GSSAPI authentication," select "Attempt authentication using SSH-2."
4. Click "Open" to connect to the server.

When prompted for your passphrase, insert the YubiKey and enter the passphrase.

In this article, we discussed how to set up SSH using YubiKey, GPG, Windows, and PuTTY. We covered key concepts, including creating GPG subkeys, storing them on a YubiKey, enabling SSH and PuTTY support in the GPG agent configuration file, and accessing a server. With these steps, you can securely access a server using SSH and YubiKey.

References

• Books:

  • GnuPG: Working with OpenPGP by Ragnar Schierholz
  • Practical GnuPG by Richard E. Silverman

• Articles:

  • SSH authentication with YubiKey
  • GPG Configuration Options
  • PuTTY SSH Authentication

• Online Resources:

  • GnuPG
  • Yubico
  • PuTTY