authorized_keys

Simple definition

A file that lists public keys that are allowed to connect to an account via SSH.

Technical definition

The file ~/.ssh/authorized_keys is read by OpenSSH to validate public key authentication.

What is it used for ?

Control which keys can log in SSH.

Practical example

The public key of a technician can be added in authorized_keys the administration account.

Common issues

• Bad permissions
• Old key never removed
• Key added to the wrong account

Related terms

SSH Key · SSH

Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.