Difference Between Rlogin and SSH

Rlogin and SSH are two well-known tools for remotely accessing a desktop and running programs and doing other things as if one is sitting right in front of it.

These technologies allow an individual to search up data or edit documents even if they do not have local access to them.

Rlogin vs SSH

The main difference between Rlogin and SSH is that Rlogin does not use encryption and is not very secure, however, SSH is comparatively very secure as it uses encryption. Another distinction is that Rlogin is suitable for users working on a private network while SSH is suitable for both private and public networks.

Rlogin vs SSH

Rlogin that is an abbreviated form for remote login, is a command that enables an authorized user to gain access to other hosts on a system and communicate with them as if they were physically present.

It does not use encryption and it is easier to impersonate a user. Rlogin is suitable for private networks only.

SSH is an abbreviated form for secure shell, it is a network protocol used to operate securely on devices using the internet. It uses cryptographic encryption, thus making it very secure and difficult to impersonate a user.

It can be used on both, public and private networks. SSH was envisioned to be a successor for Telnet.

Comparison Table Between Rlogin and SSH

Parameters of ComparisonRloginSSH
Full-FormRemote loginSecure shell
SecurityNot very secure as it doesn’t use encryptionMore secure as it uses encryption
AuthenticationEasier to impersonate a userDifficult to impersonate users as public-key cryptography is used
Single Command FeatureDoes not possess the single command featurePossesses single command feature
Type of NetworkSuitable for private network onlySuitable for both public and private network

What is Rlogin?

Rlogin (remote login) is a UNIX command that enables an authorized user to gain access to other UNIX machines (hosts) on a system and communicate with them as if they were physically present.

Once logged in to the host, the user has the ability to do anything that the host has granted permission for, such as publish, modify, or destroy data.

Rlogin is a command that is similar to the more well-known Telnet command.

Rlogin is useful for simplified login details that do not require a lot of control over the client/host interaction, but it is less useful than Telnet for multiple sessions, connections between very distant terminals, or connections to terminals that do not run UNIX, because rlogin can only connect to UNIX hosts.

The capacity of using a file called .rhosts that rests on the host system and retains a summary of stations that are allowed to log in without a passcode is one of the benefits of rlogin.

The rlogin (remote login) program was a network-based instrument for wirelessly accessing a computer. It could be used to connect to a remote computer’s command line. It was later overridden by ssh.

Everyone who still has rlogin enabled is strongly advised to disable it immediately for critical safety purposes.

What is SSH?

Secure Shell (SSH) is a cryptographic network protocol that enables two networks to be operated safely across an unprotected network.

Remote command-line, logon, and remote command execution are common uses, although SSH may encrypt any network service.

SSH uses a client-server architectural style to link an SSH client program to an SSH server and offers a secure route over an insecure network. SSH was created to be a substitute for Telnet and other unprotected remote shell protocols.

Many methods communicate classified material, usually credentials, unencrypted, making it vulnerable for monitoring and exposure via packet filtering.

SSH encryption is meant to offer data secrecy and integrity across an unprotected network, such as the Web.

There are numerous methods to utilize SSH; one is to simply encrypt a network connection using automatically produced public-private key pairs and then log in with password protection.

Another alternative is to use a manually generated public-private key pair for verification, allowing more people or programs to log in there without typing a passcode.

In this situation, anybody can produce a complete set of distinct keys (public as well as private).

All workstations that must offer access to the holder of the matching encryption key must have the public key configured. SSH just inspects to oversee whether the person presenting the public key also has the accompanying private key.

Main Differences Between Rlogin and SSH

  1. The full form of Rlogin is ‘Remote Login’ while the full form of SSH is ‘Secure Shell’.
  2. Rlogin does not use encryption and is not very secure. Meanwhile SSH is secure as it uses encryption.
  3. When using Rlogin, it is easier to impersonate a user. However, it difficult to do so when using SSH.
  4. Rlogin does not have a single command feature while SSH has a single command feature.
  5. Rlogin is suitable for private networks only meanwhile, SSH is suitable for both public and private networks.


The major distinction between Rlogin and SSH is in their security mechanisms. Rlogin was developed at a period when security was not a big concern, hence it does not employ encryption and all data is transmitted in plain text.

As Rlogin’s security flaws became increasingly significant, SSH was created as a more secure alternative.

SSH, unlike Rlogin, does not communicate everything within the plain text. Instead, the communication is encrypted to protect prying eyes from seeing what is being sent or processed.

SSH additionally employs public-key cryptography to ensure that the connected user is who he claims to be.

Rlogin does not accomplish this, allowing someone to impersonate a genuine user and get access to his account on the remote machine.

SSH also provides a capability that Rlogin does not have: the ability to connect and immediately send a single command to the remote machine.

The major application of this feature is to automate specific operations so that you may construct a unified script and thus no longer must manually enter instructions.

One may then run this script anytime they wish, or they can have it run by another means even if they are not in front of the remote server.

Because of the security weaknesses in rlogin, it should not be used if the server, customer, or ability to connect is on a public site.

Even if one is on their own private network that nobody else can join, there would be nothing to forfeit by utilizing SSH.


  1. https://www.usenix.org/legacy/publications/library/proceedings/sec96/full_papers/ylonen/ylonen.ps
  2. https://link.springer.com/chapter/10.1007/978-1-4302-0076-5_1
Search for "Ask Any Difference" on Google. Rate this post!
[Total: 0]
One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️