That part usually means that the key was generated by that user on that machine, or sometimes is the description of the key e.g. when you generate the key using puttygen . If the key is generated in a linux machine the last part would be user@hostname of machine. I would "suspect" that the server has been compromised, if you are sure that the domain.com is not one of your machine that was used to generate the key, because having a key in the authorized keys means giving access to the machine. I highly recommend using OSSEC or some other monitoring tool in future to notify you of any changes in the major files in the operating system.

Thank you

Amit K Nepal
Infrastructure Engineer (RHCE)
omNovia Technologies Inc.
Amit K Nepal
On 3/7/2013 4:49 PM, Vimal Shah wrote:
Hello all,

While randomly looking into the .ssh/authorized_keys file, I noticed a line that shouldn't have been there. This was concluded based on the last portion of the line. This portion was in the form of user@domain.com, where the domain was one of a likely competitor. Does this automatically mean that this server has been compromised? The line has been removed.

Thanking everyone in advance.

--
Vimal 


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