How to prevent junk charecters in a flat file used in a pgm

 Hi,
 Is there a way to find out the junk charecters in a flat file. I am getting a
 file from a customer that is decrypted and then encrypted and sent as a flat
 file to the AS400. But once in a while we recieve junk values in middle of the
 the flat file and now there need for a code fix in the program to trap this
 junk charected and send a message that the flat file consists some junk
 charecters and will not be processed. Can some one help me on this.
 Thanks in advance.
 Regards,
 Dinesh
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