SSH vs SSL – Which is better?
SSH – Secure Shell
Overview of SSH
SSH is a UNIX based command interface and protocol used to secure data in transmission between different devices. SSH is commonly used to manage servers or any network devices remotely. SSH comprise of a suite of three utilities namely slogin, ssh and scp which are based on previous versions of UNIX utilities rlogin, rsh, and rcp. The use of SSH utilities at both end of connection are authenticated using a digital certificate. The passwords are encrypted unlike in utilities like Telnet. SSH has a built in username/password authentication system to establish a connection. SSH uses RSA public key cryptography for authentication and establishing connection. More often than not, SSH uses SSL under the hood, so they are both as secure as each other. One of the advantages of SSH is that, using key-pair authentication is easy and is built right into the protocol.
How SSH works
SSH secure shell is a protocol consisting of three mechanisms – the transport layer, user authentication and connection protocol. The transport layer runs over TCP/IP of the OSI model. This layer provides the server authentication for the connection. This layer also addresses the confidentiality and integrity of the connection between the two ends. Another mechanism is the user authentication piece. This authenticates client side user to the server. The user authentication will run over the transport layer. The final mechanism is the connection protocol, which multiplexes the encrypted tunnel. Transmission of the connection protocol is accomplished over the user authentication layer. Once the transport layer establishes the connection, SSH works. Another service request will be send when the ...
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... into them.
• SSH is used for managing secure servers remotely, whereas SSL is used to transfer highly confidential data like credit card details etc.
• SSH uses username/password authentication system to establish secure connection, whereas SSL makes use of encrypted certificates.
• SSH is more about network tunneling and SSL is more about certificates.
• Both are used for different purposes normally. SSH is used to create a secure connection over a network and SSL is used to transfer data securely by encryption techniques and use of certificates. So it is the purpose that decides which one is better.
Reference:
1. http://www.hit.bme.hu/~buttyan/courses/BMEVIHI4372/ssh.pdf
2. http://www.differencebetween.net/technology/difference-between-ssh-and-ssl/
3. https://www.symantec.com/content/en/us/enterprise/white_papers/b-beginners-guide-to-ssl-certificates_WP.pdf
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