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Secure shell is a protocol.
Client (localhost) communicates with remote pc (remote host).
SSH client: Putty, windows 10 native one.
ssh {user}@{host}
user: account to be accessed.
host: computer to be accesses, it can be an ip, domain name, etc.
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Same key for encryption and decryption in both parties. Key Exchange Algorithm. Each session has its own ssh key.
Public - private key pair. Public keys are exchanged between parties and private keys are kept secret. Public keys are used to send encrypted messages and private keys are used to decrypt them. For instance, computer A has keys puA (public key) and prA (private key) and computer B has puB and prB. Computer a wants to send message to B. Both of them request data so that they can generate the public key of each other with the Difiile Hellman Key Exchange algorithm. Once generated, all the messages sent from A to B will be encrypted with the public key from B Difiie Hellman Key Exchange allows that the public key from another party is generated locally from data received instead of transferring the public key itself.
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