Malware added to transmissions

[Paul <onestepto () yahoo com au>]

Thanks to those who've expressed an opinion on the possibility of malware being added to a transmission in transit.
 
I didn't really have email in mind so a plain text interception/manipulation would not be required.  My query really 
centres on whether a data stream (such as a media file) being downloaded could be tainted by a compromised node so that 
the receiver gets an unwanted 'bonus'.  With veriviable files checksums should prevent this but what of files that do 
not have checksums?



one step at a time...




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