lundi 16 janvier 2012

ssh ou telnet

1. SSH and Telnet commonly serves the same purpose
2. SSH is more secure compared to Telnet


The one thing you should know about Telnet is that it is not a secure protocol. When you log into a remote host using Telnet, your username and password are sent “in the clear” – meaning, in plain text and not encrypted in any way. That means your credentials can be (relatively) easily intercepted and used to gain access to that device. For this reason (and many others) Telnet has been largely replaced by the more secure SSH protocol.

3. SSH encrypts the data while Telnet sends data in plain text
4. SSH uses a public key for authentication while Telnet does not use any authentication
5. SSH adds a bit more overhead to the bandwidth compared to Telnet
6. Telnet has been all but replaced by SSH in almost all uses

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