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SSH

SSH - is a remote administration protocol that allows users to control and modify their remote servers over the Internet

The command consists of 3 distinct parts.

ssh {user}@{host}
  1. user - represents the account you want to access.
  2. host - refers to the computer you want to access.

advantage offered by SSH over its predecessors is the use of encryption to ensure secure transfer of information between the host and the client.

3 different encryption technologies used by SSH

  1. Symmetrical encryption - A secret key is used for both encryption and decryption of a message by both the client and the host
  2. Asymmetrical encryption - Uses two separate keys for encryption and decryption.
    1. is not used to encrypt the entire SSH session
    2. only used during the key exchange algorithm of symmetric encryption
  3. Hashing - Generate a unique value of a fixed length for each input that shows no clear trend which can exploited. This makes them practically impossible to reverse.
    1. HMACs, or Hash-based Message Authentication Codes.

Both the client and the server agree on a very large prime number, which of course does not have any factor in common. This prime number value is also known as the seed value.

username and password - These credentials securely pass through the symmetrically encrypted tunnel, so there is no chance of them being captured by a third party.

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