byte    value in  value in  xor
offset  "letter"  "order"   diff
--------------------------------
0x53      97        17      80
0x6d      a3        23      80
0x6e      78        79      01
0x7b      5a        da      80
0x93      c8        48      80
0xad      d8        58      80
0xbb      6f        ef      80