(1) decode this:7227       1947       8008       65821939       1972       7834       22051287       1703       3887       22051287       83

(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.