Encryption without a key file

hi,
I have a problem and hope if any one can help me.
I'm trying to encrypt username and password using a key file generated using enterprise library and every thing works fine, but the problem is that key can only be used on the mashine on which i have generated the key,eithor by machine mode or user mode, i want to ask if their any way to use encryption without using a key file ...
for example by machine key in web config..
 
plz help me
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