What is SSH?

SSH-The Secure Shell version 2 or SSH2 protocol determines how clients can securely connect to the SSH server and then uses the secure connection created to access server resources. Among other things, the client can run the program; file transfer; and other TCP / IP connections through a secure connection. The SSH2 protocol is a derivative of the SSH v1.x protocol series. SSH version 2 is standardized in IETF and most SSH applications now support SSH version 2. SSH version 1 is less secure and is no longer used.

How Secure is SSH?

Secure Shell protocol provides server authentication services; encryption; verification of data integrity; and customer authentication. Server authentication is done using RSA, DSA, or ECDSA common key algorithms. To encrypt and validate data integrity, a number of algorithms are provided which can be modularly implemented by any SSH product. Customer authentication can be done using passwords, public keys, single Kerberos login systems and other methods. The properties of the SSH2 protocol are public and have been examined by several independent practitioners. When used correctly, it is understood that the protocols are safe against all known cryptographic attacks (passive or active).

Client vs Server

In Internet protocols, client and server terms have special technical meanings:
  1. Customers are programs that initiate connections and requests to other computers when talking about a program.
  2. The server is a program that expects to accept connections and fulfill requests. The client can run at any time or for a while depending on the time that the user needs. Clients may be more likely to run on a desktop computer, but can also run on a server computer if this computer needs to send a request or initiate a connection. The server usually always runs in the background. Servers can work more on computers in the data center. However, it is very convenient to use a server program on a desktop computer. If you are looking for SSH software, you are looking for a server if you want to install a computer that will accept connections from others and computers. If you are looking for a customer, if you want to use SSH, connect to someone else's computer.

SSH compared with SSL / TLS

SSH and TLS / SSL are different protocols used for the same purpose. Both protocols are used to verify the parties that transmit and secure data during shipping. SSL / TLS tends to use X.509 certificates based on ASN.1 encoding, and is most commonly used as a security layer for HTTP, SMTP, and FTP traffic. SSH protocols tend to use public keys that do not have a certificate infrastructure based on simple binary encoding, and tend to be used as a security layer for transferring SFTP and SCP files, terminal shell access, and other applications. SSH can be considered an incompetent TLS version. Because of the intentional independence of the X.509 certificate, SSH is suitable for links between assets with existing trust relationships in which TLS runs weak. TLS is suitable for connections between aliens.

SSH Features

SSH is a very flexible protocol and various services can use it. The open protocol architecture allows these services to run simultaneously without interfering with each other. The client and the SSH server can transfer files using the SCP and SFTP protocols running over an existing SSH session. Although SCP is an old rcp Unix tool that is shipped to different shipments, SFTP is a flexible remote file access protocol that can be used in sophisticated ways. SFTP is better standardized and widely supported, so it usually uses SFTP software that usually provides interfaces like SCP.

Note that the SFTP system is not associated with an FTP system via FTP or TLS or SSL. The protocol is independent and very different. Frequently used services are remote consoles. This involves and allocates channel systems in SSH sessions that are used as transportation for terminal protocols such as vt100 or xterm and others.The client displays a console window where the user can run the command line program on the server. SSH also provides exec requests. Execute requests run programs on the server, such as remote consoles, but there is no hope of interactive input. Exec requests are useful for automatic remote management. Other popular SSH functions are port forwarding or tunneling of TCP / IP connections. By routing SSH ports, it is possible to secure TCP / IP connections made by standalone applications that must be sensitive to network attacks.

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