Except you can't do this, since the appended data needs to be identical between the two files. That's why I used the encrypted payload -- it ties the semantic meaning of the embedded commands to posession of vec1's series of bits, which is of course what a cipher is meant to do.
:~/misc/md5$ cat msg1 I agree to sell you my horse ^Fita^, its saddle and harness for price 14000 dollars. Signed Bara
Your payloads differ but the above line is incorrect. Your actual appended files:
$ cat msg1
[terminal garbage]I agree to sell you my horse ^Fita^, its saddle and harness for price 1 000 dollars. Signed Bara
$ cat msg2
[slightly different terminal garbage]I agree to sell you my horse ^Fita^, its saddle and harness for price 1 000 dollars. Signed Bara
--Dan
