file upload encryption file name changing

please help me I have a file upload app
also a file encryption method 
in that file encryption method a file is encrypted
from a

path/file.extenssion      to


a path/filename.enc                                 --->(1)


I gave the file name using MEDIA_FILE

How can I give a filename.enc   in which "filename" changes

Now I can encrypt and store to only filename.enc 

that means I can do it once and
by the next upload filename.enc will get overwritten

I couldn't store more files


OR

MEDIA_FILE = os.path.join(BASE_DIR, 'media/fi1.enc' )


I want fi1.enc to change with each upload

so that new files will be created

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