On Fri, 2009-10-23 at 07:30 +0530, thomas v t wrote: > what is this signature.asc..pls tell something about it .. i opened > it .but can't understand It is the digital signature for the email i send. It is created using PGP. With that, and my public key you can make sure that the email originated from me. http://en.wikipedia.org/wiki/Pretty_Good_Privacy http://www.dewinter.com/gnupg_howto/english/GPGMiniHowto.html ~vimal