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(1) decode this:
7227       1947       8008       6582
1939       1972       7834       2205
1287       1703       3887       2205
1287       8337       6582       5002
8913       3887       9136       2205
1287       8337       1972       9631
(2) What are the most important properties of public key encryption scheme? Build a PKI structure.