Does Dropbear support SSH key revocation?

Summary

+ Yes, Dropbear supports SSH key revocation.

Details

1. Introduction
2. What is Dropbear and SSH Key Revocation?
3. How does Dropbear Support SSH Key Revocation?
4.

Conclusion

1. Introduction
Dropbear is an open-source, secure, and high-performance SSH and SFTP server for Unix systems. It was originally developed by Matt Johnston of Dropbear Technology and is now maintained by the OpenBSD project. The program is designed to be lightweight and efficient, making it ideal for use on embedded devices with limited resources. One of the key features of Dropbear is its support for SSH key revocation, which allows administrators to quickly and easily revoke access to a system if an SSH key is compromised or lost.

2. What is Dropbear and SSH Key Revocation?
Dropbear is an SSH server that provides secure remote access to Unix-based systems. It supports both password-based authentication and public key authentication using SSH keys. SSH key revocation, on the other hand, is a mechanism that allows administrators to invalidate a specific SSH key if it is compromised or lost, thereby preventing unauthorized access to the system.

3. How does Dropbear Support SSH Key Revocation?
Dropbear supports SSH key revocation through the use of the OpenSSH format for SSH keys. When an SSH key is generated using the OpenSSH format, it includes a unique identifier called the public key fingerprint. This fingerprint can be used to identify the specific key that needs to be revoked in case of a compromise or loss.

To revoke an SSH key in Dropbear, administrators need to generate a new SSH key and add its public key to the authorized_keys file on the server. They then need to remove the public key of the compromised or lost SSH key from the authorized_keys file. Once this is done, any attempts to authenticate using the compromised or lost SSH key will be rejected by Dropbear.

In addition to revoking individual SSH keys, Dropbear also supports the use of certificate authorities (CAs) for managing large numbers of SSH keys. With CAs, administrators can issue and revoke certificates that are used to authenticate users or devices. This provides a more scalable and centralized approach to managing SSH key revocation.

4.

Conclusion

Dropbear is an open-source, secure, and high-performance SSH server that supports SSH key revocation through the use of the OpenSSH format for SSH keys. It allows administrators to quickly and easily revoke access to a system if an SSH key is compromised or lost, thereby preventing unauthorized access to the system. Dropbear’s support for SSH key revocation makes it an ideal choice for organizations that need to manage large numbers of SSH keys in a secure and scalable manner.

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