What is key exchange algorithm in SSH?

Configures SSH to use a set of key exchange algorithm types in the specified priority order. The first key exchange type entered in the CLI is considered a first priority. Key exchange algorithms are used to exchange a shared session key with a peer securely.

How does SSH key handshake work?

Event Sequence of an SSH Connection

  1. A cryptographic handshake is made so that the client can verify that it is communicating with the correct server.
  2. The transport layer of the connection between the client and remote host is encrypted using a symmetric cipher.
  3. The client authenticates itself to the server.

Does SSH use Diffie-Hellman?

Secure Shell (SSH) [RFC4251] is a secure remote-login protocol. The core protocol uses Diffie-Hellman key exchange. On slow CPUs, this key exchange can take tens of seconds to complete, which can be irritating for the user.

Is SSH symmetric or asymmetric?

SSH protocol uses symmetric encryption, asymmetric encryption and hashing in order to secure transmission of information. The SSH connection between the client and the server happens in three stages: Verification of the server by the client. Generation of a session key to encrypt all the communication.

What is key exchange in cryptography?

Key exchange (also key establishment) is a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of a cryptographic algorithm.

Are SSH keys machine specific?

SSH key pair’s are machine independent, which means you can create a SSH key pair on one machine and can deploy the same SSH key pair on multiple machines.

How does SSH protocol work?

SSH protocol uses public key cryptography to authenticate the server, meaning the server sends its public key to the client for confirmation. The client is able to authenticate the server by comparing this host key against a local database or by receiving the verification of a Certified Authority (CA).