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SSH Key

A pair of cryptographic keys used to authenticate SSH.

TopicIT knowledge → About 1 min read

Simple definition

A pair of cryptographic keys used to authenticate SSH.

Technical definition

A private key remains client-side while the public key is placed on the server in authorized_keys.

What is it used for ?

Avoid or reduce password usage for connections SSH.

Practical example

An administrator can connect to a Linux server with an Ed25519 key.

Common issues

  • Exposed private key
  • Incorrect Permissions
  • Key never renewed

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

Related resources

Relevant topic SSH An encrypted protocol used primarily to administer remote systems. Relevant topic authorized_keys A file that lists public keys that are allowed to connect to an account via SSH. Relevant topic SSH Agent A process that temporarily retains private keys unlocked in memory. Relevant topic SSH Host Key An SSH host key identifies the remote SSH server and helps clients detect connection interception.
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