20090908a - Computer Security SSH and CVS Repositories GOAL...

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Computer Security, SSH, and CVS Repositories GOAL: Explain about using SSH and CVS and at the same time introduce some concepts from computer security.
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Authentication and Authorization Authentication is a procedure by which you identify your- self to a computer system. Authorization has to do with whether you are allowed to access certain data or services. When you log in to a remote server, you authenticate your- self to the server and the server decides whether you are authorized to use the system.
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Traditional Login In a traditional remote login, the following takes place: 1. You establish a connection between a terminal ( e.g. your PC) and the remote server. Information flowing over the connection is in cleartext (unencrypted). 2. You authenticate yourself by supplying a login ID and a (supposedly secret) password. 3. The remote server validates the ID and password and allows the session to proceed if you are authorized . 4. You use the remote server over the connection.
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Traditional Login: Problems There are many security problems with traditional login. Your ID and password traverse the network in cleartext. Your entire session traverses the network in cleartext.
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20090908a - Computer Security SSH and CVS Repositories GOAL...

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